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  1. Trailer Axles
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  3. 3500 lbs
  4. Universal Fit
  5. Rubber Spring Suspension
  6. 5 on 4-1/2
Timbren Axle-Less Trailer Suspension System w Hubs - Straight Spindle - 5 on 4-1/2 -

Timbren Axle-Less Trailer Suspension System w Hubs - Straight Spindle - 5 on 4-1/2 -

Item # A35RS545
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Our Price: $1,143.58
Trailer Axles
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Shipping Weight: 109 lbs
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Timbren Easy Lube Spindles Trailer Axles - A35RS545
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The Axle-Less system provides a smooth, quiet, safe ride and can eliminate the need for an axle, allowing for maximum ground clearance and a low deck height. Suspension units replace your existing axle and operate independently. Fits any frame width. Lowest Prices for the best trailer axles from Timbren. Timbren Axle-Less Trailer Suspension System w Hubs - Straight Spindle - 5 on 4-1/2 - part number A35RS545 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Timbren Trailer Axles - A35RS545

  • 3500 lbs
  • Universal Fit
  • Rubber Spring Suspension
  • 5 on 4-1/2
  • Idler Hubs
  • Easy Lube Spindles
  • Timbren

The Axle-Less system provides a smooth, quiet, safe ride and can eliminate the need for an axle, allowing for maximum ground clearance and a low deck height. Suspension units replace your existing axle and operate independently. Fits any frame width.


Features:

  • Suspension system provides a safe, smooth, quiet ride for your trailer
    • 2 Separate units replace your existing axle
  • AEON progressive-rate main springs absorb road shock and support trailer's load
    • Deliver a smooth, stable ride, regardless of load size
    • Compress and become stiffer as load increases, boosting spring strength
  • Rebound springs act as return devices to minimize rattle and bottoming out
    • Create constant pressure on the arm, so the suspension is never completely relaxed
  • 2 Independent units can eliminate the need for a thru axle
    • Increase ground clearance
    • Lower deck height for easier loading and unloading
    • Reduce roll during cornering
    • Fit any trailer width
  • Built-in camber and toe-in help your trailer to track straight, reducing wear on the tires
  • Straight, EZ Lube spindles with hubs accept any 5-bolt wheels with regular tires
    • EZ Lube feature makes it easy to grease bearings without removing the hub
    • Spindles can be easily removed from units for simple replacement if damaged
    • Bearings, races and seals are included with hub
  • Heavy-duty steel construction with black powder coat finish resists wear and corrosion
  • Easy to install and align
    • Bolt or weld to your trailer's frame


Specs:

  • Fits: 1-axle and 2-axle trailers that use regular tires
    • Not recommended for triple-axle applications
  • Bolt pattern: 5 on 4-1/2"
  • Weight capacity: 3,500 lbs
  • Quantity: 2 suspension units with hubs
  • Spindle/Hub compatibility:
    • Bearings: L68149 inner, L44649 outer
    • Races: L68111 inner, L44610 outer
    • Seal: 10-19
  • 3-Year limited warranty


Note: The Timbren Axle-Less suspension system may require additional support on your trailer. If your trailer does not have a crossmember above the spot where you want to install the Timbren system, you may need to reinforce the frame. You can accomplish this three ways. First, you can retrofit the trailer with a crossmember. Second, you can build out the trailer frame. Third, you can use standard, 2-inch steel tubing to connect the 2 Timbren suspensions together using the built-in square hole on each unit.


Ground Clearance

Ride on rubber with Timbren's Axle-Less trailer suspension system. This one-of-a-kind suspension consists of two separate units, each containing rugged steel arms and two strong, hollow rubber springs. Overall, the system safely and effectively absorbs road shock, minimizes trailer bounce and rattle - regardless of load size - and helps to protect your trailer's components and cargo. Built-in camber and toe-in keep your trailer tracking straight to minimize tire wear. Integrated hangers attach to your trailer's frame. And 2-inch holes make it easy to reinforce your trailer's frame by adding standard, 2-inch-square steel tubing (if needed).


The Axle-Less independent suspension system replaces your trailer's existing leaf spring suspension and can eliminate the need for an axle. The independent action of the suspension reduces roll when your trailer is cornering and allows you to maximize ground clearance and minimize deck height. Your trailer can have the same side-to-side clearance as your tow vehicle. And the low deck height makes it easy to load cargo from either the rear or the side.


Because you're riding on rubber, your trailer will ride smoothly and comfortably, whether you're navigating rocky terrain or highway asphalt.


Timbren Axle-Less Suspension Parts

Components

  1. The AEON progressive-rate main spring supports the weight of your trailer and cargo and easily absorbs road shock. It is constructed of heavy-duty, hollow rubber.
  2. The rebound spring minimizes trailer bounce, rattle and bottoming out. It keeps the suspension under constant tension and ensures that the main spring compresses and expands in a controlled fashion. And it delivers a smooth, stable ride - regardless of how much cargo is on the trailer.
  3. The trailing arm and integrated hanger attach the suspension to the side and bottom of the trailer frame.
  4. The control arm carries the spindle and the hub. It pivots on strong, long-lasting urethane bushings that never require lubrication.
  5. The EZ lube spindle is simple to grease. If damaged, it can be removed and replaced, saving you both time and money.
  6. The hub accepts any 5-bolt wheel that has a regular tire.
  7. The built-in square hole accepts standard 2-inch tubing. If there is no crossmember above the suspension, you can easily add support to your trailer's frame by inserting 2-inch steel tubing through the hole on each suspension unit and then bolting the tubing into place.

Timbren Axle-Less Suspension versus Leaf Springs

Leaf Spring Example

The Axle-Less suspension's progressive spring is a definitive upgrade over leaf springs. Although leaf springs deliver a stable ride when supporting a load, a trailer with leaf springs will bounce and rattle when it's empty or supporting a light or off-center load. On the other hand, your trailer can bottom out on bumpy roads if the load is too heavy. The AEON progressive-rate springs of the Axle-Less suspension always deliver the same reliable performance, no matter the load size. As more weight is added to the trailer, the springs compress and become stiffer, offering more support for heavy loads. And because they rebound more slowly than leaf springs, the AEON springs do a better job of absorbing road shock, thereby keeping your trailer from bouncing and rattling when you're carrying a light load. So with this versatile system you will enjoy a smooth ride whether you're towing an empty trailer or a hefty load.


Unlike leaf springs, Timbren's Axle-Less suspension units operate independently of one another. Each spring activates only when needed. This reduces roll and delivers top-notch performance, even when you're hauling off-center loads. When your trailer with leaf springs takes a turn, one side of the suspension compresses and takes on more weight, and the other side becomes looser and bounces. This causes rattle and can make the trailer lean to one side. But when your trailer with the Axle-Less suspension takes a turn, one side compresses and becomes more rigid to absorb the weight, and the other side expands to normal height to help steady the load and minimize bounce and rattle. The load stays better balanced, even if it is off-center.


Timbren Axle-Less Suspension versus Torsion Axles

Torsion Axle Example

Timbren's Axle-Less trailer suspension system is a great alternative to torsion axles. While both systems allow either side of the trailer's suspension to operate independently, only Axle-Less suspensions are actually separate units. Torsion axles still require a bar that spans the bottom of your trailer, whereas Timbren's system can eliminate the need for a thru axle - giving you the same amount of ground clearance from the front of your trailer to the rear. It also allows Axle-Less suspensions to fit any trailer width - unlike torsion axles, which have to be fitted to an exact frame width.


Axle-Less suspensions operate in a smoother, less stressful manner than torsion axles. Torsion axles use a twisting motion, where the bar inside the axle tube rolls against rubber cords or a rubber wall to create compression and resistance. The up-and-down motion of the main spring and the side-to-side motion of the rebound spring in Timbren's Axle-Less suspension work together to provide smooth, consistent compression - with no twisting - that results in a better ride and less stress on the suspension's components.


Installing the Timbren Axle-Less Suspension

Whether you are building a trailer or retrofitting your existing trailer with the Axle-Less system, you must make certain that the trailer's frame is both perfectly square and sturdy enough to support a heavy load without the aid of a thru axle.


Install Option 1

There are three ways to install the Axle-Less suspension. The easiest method, which is recommended if you are replacing axles on your trailer, is to install a piece of 2-inch-square tubing (sold separately - available at most weld shops) through the integrated hole in the Axle-Less suspension. Then all you need to do is bolt the suspension to the side of the trailer's frame with three bolts (not included).


Install Option 2

The second option for installation is to fabricate an inboard extension plate that attaches the trailer's frame to the Axle-Less suspension.


Install Option 3

The third method of installation is to bolt the Axle-Less suspension's hanger to the trailer's frame and to an existing crossmember that is in the area where you want to install the suspension.


With both the second and third options, you must use three bolts to attach the suspension to the side of the frame. And you also have to use two or three bolts to attach the suspension to the bottom of the frame extension, or crossmember. Both the second and third methods of installation will eliminate the need for a thru axle and provide the most clearance.


Measuring Diagram

Timbren's Axle-Less suspension units should be installed directly across from one another. Before mounting the units, measure back from the coupler and mark the frame to make sure that the two distance measurements (A and B) are within 1/8 inch of each other. Then you can drill holes through the frame and attach the hangers with Grade-5, half-inch bolts (not included).


Dimensions of the Timbren Axle-Less Suspension

Dimensions 1

Dimensions 2

Dimensions 3

Dimensions 4


A35RS545 Axleless Trailer Suspension System by Timbren - Hubs with 5 Studs on 4-1/2" Bolt Circle - Regular Tires - 3500 lbs

ASR3500S05 Timbren Axle-Less 3500S, P020 Outboard Arm Straight Spindle w/ Brake Flange

84545_2 3500 lb Idler Hubs - 545 1/2" Stud - Qty 2






Customer Reviews

Timbren Axle-Less Trailer Suspension System w Hubs - Straight Spindle - 5 on 4-1/2 - - A35RS545

Average Customer Rating:  4.7 out of 5 stars   (207 Customer Reviews)

The Axle-Less system provides a smooth, quiet, safe ride and can eliminate the need for an axle, allowing for maximum ground clearance and a low deck height. Suspension units replace your existing axle and operate independently. Fits any frame width.

by:

I rebuilt a 4 x 8 trailer using the Timbren Axle-Less Trailer Leaf Spring Suspension and it works great. I would recommend it to others.


Comments
Working out just fine.
David J - 09/25/2020

by:

They did a great job communicating. I was evem offered an alternative item that was in stock, but ultimately I decided to wait for the backordered parts since they were heavier duty.



by:

Had a broken torsion axle on dual axle boat trailer. Manufacter six to eight weeks to replace. Got this product in week. Installed same day. Very happy .cancelled new Axel order.



by:

Awesome suspension! I’ve been towing my al. trailer with our atvs & dirt bikes and it’s always been a smooth ride. Love it!



by:

I was amazed at the attention given to me and my order. I was kept up to date untill my order arrived, it also arrived a few days before the expected time. The axle less system looks to be so much easier to install and more functional than the regular spring suspension. If compared by cost and labor to the other spring system, I find that this is considerably less. I have yet to install it, but will send photo of finished product as soon as possible.



by:

Still working on it but so far I am very please with my purchase



by:

Great product,super quiet while trailing on the road. Great for replacing dual axles and gives better options when you have a tire flat or hub issue. All of these are independent of each other.



by:

Just what I wanted. This is a great productions Etrailer did a great job thank you. We will be doing more business soon.



by:

Fast delivery, exactly what I needed to repair my boat trailer.
Good quality, easy installation...



by:

Ashley was extremely helpful and quick to respond to my questions both via phone and email. Excellent customer service and quick turn around on my order.



by:

Great system



by:

Customer service was excellent and the products were well priced



by:

GREAT PRODUCT BUT THE BEST OF ALL IS CUSTOMER SERVICE, THEY ARE ALWAYS HELPFUL



by:

I have not installed them yet but looking at them they look like they are going to be easier than I expected.



by:

have not opened the boxes yet



by:



by:

Review from a similar Axle-Less Suspension in Trailer Axles


The trailer rides great down the road and no more worries about saltwater and rusty leaf springs. Not a cheap option but I’m very happy with the setup. When installing, just be sure to measure accurately and have sharp drill bits. A drill press type of guide also helps ensure correct drilling angles. The first picture is of a mounting gusset a local welding shop made. One is needed for each side and necessary to provide needed mounting strength-at least on my trailer frame. Pics 2 and 3 show the mounted suspension on one side of the trailer. Pic 4 shows the suspension on one side of the trailer with the axle attached and a separately purchased disc brake assembly mounted on it. Finally, pic 5 shows a 2” box channel between both suspension assemblies. Independent suspensions would have been nice, but I wanted to ensure trailer rigidity was maintained. So, after one year, so far, so good. It’s all smooth sailing down the highway.


Comments
Actually over a year, and still working great.
dale - 04/22/2022

by:

Review from a similar Axle-Less Suspension in Trailer Axles


Trailer suspension and disk brake performance is outstanding big big difference over leaf spring and electric drum brakes.
Installation required modifications to the frame to monut the timbren suspension


Comments
The Timbren axle less suspension and Disk brake and disk brake controller system is still work great. will never go back to drum brakes or leaf spring axle suspension.
Quintin - 01/06/2022

by:

Review from a similar Axle-Less Suspension in Trailer Axles


They have more pros than cons, but the second set I bought broke the flat plate that holds the spindle at about 8 months. The steel quality seemed less than I would expect since it basically peeled it back like a pop can as you can see in the pictures. Otherwise I like the clearance and ride. They last 2-3 years where the torsion axles I replaced would wear out in 4 months after driving down rough gravel roads. There is a grade zerk on the underside which I didn't realize until I bought the second set. That would have helped the first set last longer had I known about it.


Comments
The Timbren Axle-Less Trailer Suspension - 4 Spindle w Brake Flange - Regular Tires - 7K Part # TASR7KS02 has a 3-year limited warranty. I will have Customer Service reach out to you.
-- Etrailer Expert Thomas M - 12/22/2021

by:

Review from a similar Axle-Less Suspension in Trailer Axles


I used these axles in a different way than most would. I needed a trailer that was small, could handle tight switch-backs, carry 600 lbs and be light. I had this idea and as a retired design engineer I saw a great possibility in this axle. I have made four of these trailers now, one as a camp trailer, 2 for trail work for State Parks and one as a utility trailer.


Comments
Really cool work!
-- Etrailer Expert Sierra K - 07/07/2021

by:

Review from a similar Axle-Less Suspension in Trailer Axles


Needed a suspension system that I could make a low profile kayak trailer, that would fit in a specific area next to my garage. These were excellent that I could make the trailer any width I wanted. Easy to install and well made.



by:

Review from a similar Axle-Less Suspension in Trailer Axles


Very exicited about these axels, I have been eyeing these for over a year. (Excellent service from etrailer, they had my parts to me in 1 day from the time of placing the order.) These axles seem to be well made and fit nicely with the Dexter hub and drum assembly and the 12" electric brake kit. I installed this all on a M1101/M1102 trailer frame after removing the factory axel assembly. I have not ran these on the road or off as of yet but will give another review at that time. The fit and finish are great and the packaging was good, a little banged up from shipping (missing 1 washer)



by:

Review from a similar Axle-Less Suspension in Trailer Axles


I am not a mechanic so Brandi was real helpful. Had to get some professional help to remove the old suspension and install the new suspension. The only drawback we ran into was the spindle did not extend out far enough to mount the tires in the normal way. We had to put the tires on backwards. It all worked out beautifully. Towed the trailer for over 1700 miles without any problems. Brandi was delightful to talk with and very patient with me. Her help was most appreciated. Sorry, I didn't take any pictures.


Comments
good
R C - 12/19/2021

by:

Review from a similar Axle-Less Suspension in Trailer Axles


Purchased 2 sets of the Timbren 1200 Axle-less systems for upgrading the suspension on an older 30' ft glider trailer. Single axle with small (13") tires made towing tough due to porpoising, dragging on drive entrances do to poor flotation; also German made and metric, no repair parts. GVW 2000 lbs equated to bouncy ride.

Dual sets now allow the trailer to ride over bumps and sharp inclines easily, smoothly, little bounce on country roads; porpoising is history. My glider now rides securely, safely, quietly.

Install time 4 1/2 hours (includes head-scratching). Results are outstanding, units are totally solid. Recommend the square tube interconnect, easy and quick - trailer frame was on the light side, so a precautionary fix. Clean look underneath.

Ordered 5 wheels w/tires, very nice.

Helpful neighbor so impressed he ordered a HD single set for his new DIY snowmobile trailer.

Customer satisfaction 100%, from phone order, online support, product information, immediate shipping, install instructions, followup... HIGHLY RECOMMENDED!


Comments
I have just a little more to add regarding my purchase: Two sets, of the Timbren Axle-less assemblies, 1200 lb, and 5 wheels. I placed the order via phone, and whoever was on-call that day provided great answers and recommendations regarding the units, wheels and tires. At 31 feet, the trailer originally exhibited amplified porpoising on any bumps or dips in the road. Also bouncing and occasional sideways tipping due to the single axle. It made a lot of noise on my mountain community washboards. I speculated that the Timbren units would solve most, if not all of these problems and they have. Installation on my older 31 ft European ie, metric and no longer manufactured glider trailer was a mere 4.5 hours from removal of the old single axle to setting the trailer back down on its new assemblies. Instructions are complete, precise, useful and helpful. Appreciated. Little to comment on as installation was all straight-forward. I would like to describe the maiden voyage to the airport and back, but there is nothing to tell, other than it towed beautifully proper alignment instructions, and all that I viewed from the rear view mirror looked like a magic carpet ride. It rides over washboards and pot holes like a marathon hurdler, the 4-wheel independent suspension is great. Packaging: the shipping boxes all arrived in good condition, but the cardboard component boxes inside them... not so much. Most were ripped and open due to heavy components lightly surrounded with brown packing paper, just token amounts. Parts: all was accounted for minus a pair of spindle axle washers for one set, easily replaced at the local farm and ranch supply. No squawk, just an fyi. I am very pleased with your product and support, and was happy to leave a 5-star review with photos. The upgraded suspension was also a topic this past weekend at the glider port by those who regularly trailer their ships to various soaring events, some as far as a thousand miles away. My compliments to eTrailers, hope you can use my info,
-- comment by: Kelly F - 11/28/2018


by:

Review from a similar Axle-Less Suspension in Trailer Axles


A must have suspension if you're building an off-road trailer!


Comments
Its been a year and this suspension is still doing great!
David R - 09/27/2021
25
207
Show More Reviews

Ask the Experts about this Timbren Trailer Axles



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    I recommend an axle-less system for your trailer. The axle-less systems can be mounted to the trailer frame. This means you do not need the springs and hangers and you aren't restricted by the width of the trailer frame. If you need electric brakes with the hubs I recommend part # A35RS545E. This system has a straight spindle and includes brakes, bearings, races and seals, and hubs with a 5 on 4-1/2 wheel bolt pattern. If you are looking for idler hubs with the axle I recommend part...
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  • Recommended Timbren Axle-Less Trailer Suspension System to Replace 3500 lb Axle
    We don't carry an axle that has these specs, but we do have an axle-less suspension system that will work perfectly for your. We have a Timbren system that replaces your leaf spring suspension, and is a universal fit for different lengths. It has the EZ Lube spindles you are seeking as well. For a system with electric brakes, I recommend the Timbren Axle-Less Trailer Suspension System w Electric Brake Hubs - Straight Spindle - 3,500 lbs # A35RS545E and for a system with an idler hub,...
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    According to your axle tag it looks like you have a 3,500 lb axle that is overall length 94.5 inches with spring centers 70 inches. Since we don't have any standard axles that match those dimensions best option we have would be Timbren axle less kit like the part # A35RS545E for if you need brakes or # A35RS545 for idler hubs. If you wanted a traditional straight axle you'd have to find a local trailer shop to you who can order in custom axles based on dimensions.
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    Assembly is pretty straightforward for the Timbren Axle-Less Trailer Suspension System w Hubs # A35RS545 that you referenced, but no it does not come fully assembled. To see how the parts come in box see the picture I attached. To see how the hubs would assemble on the hub with the included bearings and seals see the video I attached. Fast forward to the 1:20 mark as up to that point the video is focused on removing the seals and bearings.
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    From the website link you sent, I got a great idea what you need. Unfortunately we do not have a replacement axle in our available inventory for you at this time. Another option to consider is moving to a Timbren axle-less suspension system like Item # A35RS545. The Timbren axle-less system, Item # A35RS545, provides a smooth, quiet, and safe ride and eliminates the need for an axle. This allows for maximum ground clearance, lowers your overall deck height, and it fits any frame width....
    view full answer...
  • Information Needed to Add a Second Axle to a 1987 Shelby Trailer
    Since there could have been axle modifications to your 1987 Shelby Trailer there really is no way of telling what axle you have on your trailer from my end. What you can do though is check the weight capacity of your current axle and find out what the hub-face-to-hub-face (A) measurement is and the spring-center-to-spring-center (B) measurement is and get an axle that is comparable. You will also want to check to make sure that you get an axle that has the same spindle measurements (inner...
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  • Recommended Timbren Axle-Less Trailer Suspension System for Boat Trailer
    To fit your boat trailer, I recommend the Timbren Axle-Less Trailer Suspension System w Hubs - Straight Spindle - 5 on 4-1/2 # A35RS545. This system will have the hubs you need as well as the suspension so you don't need to work about the leaf springs. This is a universal fit, so the odd sizing of your current axle and spring centers won't be an issue. You will just need to get a 2 inch square bar to attach to the integrated holes in this assembly. I've attached a video to help, but...
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  • Could the Timbren Axle Less System A35RS545 Fit a 1984 Starcraft
    Most likely the Timbren Axle Less System part # A35RS545 would work well on your camper but you would need to compare the dimensional drawings I attached to the setup of your trailer to see if it would clear everything. The hubs are 5 on 4-1/2 inch bolt pattern like it sounds like you would need. Due to the universal nature of this setup I can't really see a reason why these wouldn't fit though.
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  • Outside of Tires are Wearing too Quickly
    It sounds like you are not putting enough weight on the axle. Since the arch that axles have are meant to help accommodate the weight, you most likely are not putting enough weight on it. If that doesn't work then I recommend going with a different axle as replacing tires very often can be a bit of an expense. I am linking our selection of axles for you to look through, but I do recommend going with a Timbren axle-less suspension system, like part # A35RS545. These do tend to have a little...
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  • Replacement 3,500 Lb Axle for a Boat Trailer with EZ Lube Spindles
    Most trailer axles have a weep hole if water gets into the shaft but the main concern is getting water in the hubs. This can usually be eliminated by using a double lip grease seal. If you can measure the grease seal or read the part numbers you have now then I would see if we have a replacement for you. However, we do not have a standard axle in the measurements you provided. We do have the Timbren Axle-Less Trailer Suspension System part # A35RS545 that will work as a replacement. This...
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  • Timbren Axle-Less System Recommendation for a Boat Trailer
    The Timbren Axle-Less systems like the part # A35RS545 that you referenced would work great on a boat trailer. These work great on boat trailer applications because they don't have an axle that runs down the middle of the trailer which can hurt ground clearance.
    view full answer...


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