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Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E

Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E

Item # AM10140
Our Price: $71.21
Trailer Tires and Wheels
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Shipping Weight: 15 lbs
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AM10140 - 145/80-12 Kenda Trailer Tires and Wheels
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Product Expert Mary E

Is this right for you? Product Expert Mary E says:

Yes, if you:

  • Need a higher weight capacity to support your heavy camping gear
  • Often tow long distances on the highway on the way to the campsite
  • Frequently tow a trailer on wet or icy roads

No, if you:

  • Speed while towing on the highway
Radial special trailer tire with automotive-grade tread has a ply rating of 10 and a 1,520-lb max load at 80 psi. Designed for highway use. Constructed of double steel belts and full nylon plies. Fits 12" wheels. Great Prices for the best trailer tires and wheels from Kenda. Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E part number AM10140 can be ordered online at or call 1-833-496-1390 for expert service.
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  • Reviews (1595)
  • Q & A (0)
  • Photos
  • Why etrailer?

Kenda Trailer Tires and Wheels - AM10140

  • Tire Only
  • 12 Inch
  • 145/80-12
  • Load Range E
  • Radial Tire
  • K - 65 mph
  • Kenda

Radial special trailer tire with automotive-grade tread has a ply rating of 10 and a 1,520-lb max load at 80 psi. Designed for highway use. Constructed of double steel belts and full nylon plies. Fits 12" wheels.


  • Radial ply tire is great for highway use
  • Constructed with double steel belts and full nylon plies for superior function and long life
    • Premium rubber compound materials help disperse heat
  • Automotive-grade, computer-generated tread has sipes that channel water away from the tire to improve traction during wet, snowy, or icy conditions
  • Special trailer (ST) tire has sturdy sidewalls so that it can handle heavy loads
    • Created specifically for trailers and not intended for use on other vehicles
  • Meets DOT specifications


  • Fits: 12" x 4" rims
  • Tire size: ST145/R12
    • Section width: 5.7"
    • Outer diameter (when inflated): 21.3"
  • Capacity:
    • Load range: E
    • Ply rating: 10
    • Maximum load: 1,520 lbs at 80 psi
  • Maximum speed: 65 mph
  • 5-Year limited warranty
  • 1-Year worry-free guarantee

1-Year Worry-Free Guarantee

This tire has a 1-year worry-free guarantee. If within the first 12 months the tire is damaged in any way, it will be replaced at no charge.

Karrier S-Trail Radials with Automotive-Grade Tread

Kenda Karrier S-Trail Tread Vs Standard Tread

Unlike standard trailer tire tread, which has solid, continuous ribs, the automotive-grade, computer-generated tread on these Karrier S-Trail radials has ribs with breaks. These breaks allow water to run off to the sides. The Karrier S-Trail tread also has sipes. Siping is a process in which thin grooves (or sipes) are cut into the rubber of the tire. The grooves channel water away from the tread so that the tire makes better contact with the road. Both of these features greatly improve traction during wet, snowy, or icy conditions.

Karrier S-Trail radials are constructed with double steel belts and full nylon plies for increased durability and endurance. The premium rubber compound materials of this tire help disperse heat.

Radial Tires vs. Bias Tires

Radial tire vs bias tire graphic

Radial ply tires are designed for trailers that are towed on the highway. The cords on a radial tire are positioned at a 90-degree angle to the direction of travel so that they lay across the width of the tire from wheel lip to wheel lip. This construction prevents the cords from rubbing against one another when the tire flexes, unlike the cords on a bias ply tire. As a result, radial tires have less rolling resistance and heat buildup, which leads to a longer tread life and improved steering at higher speeds.

10140 Kenda Karrier KR25 S-Trail ST145/R12 Radial Tire - LR E

Customer Satisfaction Score:

Customer Reviews

Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E - AM10140

Average Customer Rating:  4.8 out of 5 stars   (1594 Customer Reviews)

Radial special trailer tire with automotive-grade tread has a ply rating of 10 and a 1,520-lb max load at 80 psi. Designed for highway use. Constructed of double steel belts and full nylon plies. Fits 12" wheels.


I needed a quality set of tires for my 1959 Lil Loafer camper trailer, the only tires I could find at any tire shop local to me were bias ply and nothing over a load range D. So needless to say those would wear out real fast and not track very will. These Kenda radials will fill the need perfectly. A load range E 10 ply rating will give me the confidence I need when hitting the road. I had them mounted at a local tire shop and took it out for a test run and they sure help the little trailer track nice. Great tire for a little vintage trailer.

Delivery was fast as well, less than a week. The price is fair with the exception of the Canadian exchange on the US dollar. And the website works smooth for orders, I'll be back for other stuff for sure.

The tires are performing very well. We have a longer trip planned this summer so that will give them a good run, but I’m sure they will be great.
Doug K - 05/29/2018


After two seasons on my tandem axle boat trailer (5100 lb combination) I’ve been very happy with the tires. I have about 5k miles on them and they are holding up nicely. Highly recommend, far better performance than what I got out of the factory supplied tires (tread separated and broken cords after 2 years on factory tires)


Got the new tires and had them mounted up. Im glad etrailer had a better small tire for my 5x8 trailer. Ive Had other tire shops tell me 4 or 6ply was the only ply available for the small trailer i had and the farm stores only offered the 4 or 6 ply tire.
Etrailer had 10 ply,radial tires for my need that is rated up to 65 mph on the highway and im very happy. Living on a gravel road, and using the small trailer on the farm i would have flat tires all the time with the old weaker 6 ply tires it came with and they wouldnt last very Long if used them on the pavement.

Still going strong. No flats and tread wear is still doing great also. Id say theres only about 1000 miles on them as i dont use the trailer every day but i did use it on my farm where the other tires wouldnt last long before getting a flat from a cut off tree stump or thorns. I will buy again when needed and have told plenty other people about the tires and where to get them.
James - 09/07/2019


Easy to order, quick shipping and exactly the tires that I needed for my Acme EZ.Tow Dolly. Now let’s hope they “wear” appropriately!


There was a bit of a hiccup in service, I ordered a tire that was apparently not in stock. I was sent an email suggesting another tire but it took me several days of not seeing any change in the order process. Can’t remember what their site was saying but nothign was happening. SO I looked at the one email that was sent and discovered it was out of stock. They need to revise the system to report that issue when ordering. Otherwise, once The product was received it was sent and arrived within a few days.

I mounted the tires on my trar trailer we pull behind our Spyder. for a trip out west in June and July—the height of the heat wave— and loaded the trailer down. The tires performed very well and after about 10K miles, show next to no wear.
Parrish - 03/05/2022


I use this tire on my motorcycle trike. Until I found them on your site I was purchasing tires from [superstore] and they were not lasting long. The tires I got from etrailer last 3 or 4 times longer and at a good price.


Great tires and rims as the old ones were not as strong as these. I don't use the trailer much but they are still riding high. Thank you


I am 100 percent happy with the tires and rims, they are exactly what I was looking for. In the last year I have purchased 4 new 6 ply bias tires due to the new tires I had purchased the year before blowing out with a load. I purchased the 10 ply radial tires with the new rims for a new look and better reliability. The trailer pulls great and the tires and wheels handle excellent. These are great products that I couldn't find anywhere else. Thanks etrailer.


Great tire at a great price.made for the Highway To get to my destination

by: 10/12/2022

Excellent tire and a great price.The young lady I talk with was very pleasant and professional. She promised to ship quickly and I received a confirmation that it shipped the same day I ordered them. I highly recommend doing business with this company.


Great high speed trailer tire with an even better price!!!


Received tires very quickly after order was placed. E-trailer has never disapointed me yet. Their prices may be slightly higher than other vendors but they more than make up for this with their service.


This is the second pair of these ST 145/12 radial I have purchased for my vintage 1959 Lil Loafer trailer. After taking the first pair on a couple of short trips I realized I did not have a radial spare, only my old bias ply tires. Since I don't want to mix radial and bias I figured I should buy another pair for spares, (in spite of the exchange rate on the Canadian dollar and the cost of shipping to Canada). Still loving these tires in comparison to the bias ply, we are planning a longer trip still this year so that will be a good test.

Oh, I even reused the packaging to protect my bench top while repacking the bearings.


In spite of the covid delays happening everywhere, etrailer still came thru and delivered the tires and wheels I need to make my small business keep going!


I have ordered several items over the last couple of years. And the parts have always fit and high quality, did I mention the shipping fantastic and on time.


great service, fast shipping and always a pleasure to do business with


Assume they will be good, replacements for my cartowdolly Dolly


Be careful ordering tires and rims from this company, I received my order as three separate pieces, the tire was not mounted to the rim. If there was a place to specify that I wanted them pre-mounted it was not easy to find on their website. Next time I am going to my local [farm store].

Thank you for your review. We do not mount any tires but we do have options available that come pre-mounted. I have attached some of your size:
-- Etrailer Expert Sierra K - 06/08/2021


Great product l! I trust these tires!


Great tire


The tires are gray for my trike. Will not buy from anyone else. Tried other tires but the didn’t last long as the ones I got from Etrailer.


I just received the tires today and haven't had them mounted yet so all I can is they look great. Summer before last, we took our pop up camper out West through 18 states in about 60 days. All of our camping up that point had been around Florida where we live, so no long road trips. On our out West trip we had 4 blowouts on our little pop up camper and since we were on the road, we would pick up tire/wheel assemblies from Wal-Mart or Harbor Freight. Did not really know what else to do. Experience has taught us better and that's why I ordered these load range E, 65 mph, 10 ply rating tires. The proof is in the pudding as they say, so in the fall, we will find out how good these tires are and I will write a full review then.

Very happy with these tires. Took another long trip last year, Florida to Maine, back home, then to Alabama, Ga and home. Towed 65 mph. No tire problems at all. What a relief!
Joseph - 04/04/2020


The tires came as fast as they said they would. I took them to my local tire shop to have mounted and balanced. They told me afterwords that the tires have a slight wobble they couldn't balance out, so time will tell on how well they wear. Put 60 miles on them so far and haven't noticed any issues.

Have not had any issues. Tires hold air good. I dont think Ive had to add air all year. They were still at pressure after sitting all winter. Been putting 2 to 3 60 mile trips weekly on them this summer. I dont tow over 60 mph. I was even forced off the road by a driver that crossed the center line. Very scary! Dont know how the boat didnt roll we were half diwn in the ditch. Tires stayed good.
Wally - 08/25/2021


I had both my original tires blowout on my camper these tires are way better quality!!! I was extremely please with how fast the delivery was . Especially because the holiday weekend was coming up an had a camping trip with the family planned. ( this is honestly the very first review I have ever written, but felt the need to do so based on extremely fast delivery) I have not yet traveled with these tires as of yet but will gladly write another review if necessary. Definitely will order more things from e-trailer


Great service, reasonable cost and good grade tire, had mounted and on the trailer, better than OEM tires. Always a great experience with

Show More Reviews

See what our Experts say about this Kenda Trailer Tires and Wheels

  • Why Should Trailer Tires be Inflated to Their Max PSI
    With trailer tires you want to always run the max psi. Not only does it allow the tire to have it's max capacity when inflated to the max psi, but it also helps prevent the trailer tire from heating up while on the highway as well help prevent sway that would be caused by under-inflated tires. I attached a help article on trailer tires for you to check out as well.
    view full answer...
  • Do Trailer Tires have a Wear or Mileage Rating
    No, trailer tires like # AM10140 typically do not have a wear or mileage rating on them. The treads do have the wear indicators that you can see in the picture I have included.
    view full answer...
    Image 1 for
  • Will Karrier S-Trail ST145/R12 Radial Trailer Tire # AM10140 Fit on 4-Inch Rims
    Both tire sizes you referenced, 5.30-12 and ST145/R12, fit on the same 4-inch width rims. Both tire sizes have an overall diameter when inflated of a bit over 21-inches. The linked article on tire sizing may be of interest to you. Switching from a bias ply to a radial tire offers several advantages. A radial tire flexes more than a bias tire, giving it better ground contact, traction, stability, and tread wear. A radial tire will normally run cooler than a bias ply tire, especially when...
    view full answer...
  • How to Determine Tire Age and at What Age Should a Trailer Tire Get Replaced
    The common recommendation is that trailer tires should be replaced at 6-7 years of age regardless of if the tread of the tire is still good. This means 6-7 years after the manufactured date and not just when the tire was purchased. Here's how to tell a tire's age. The DOT number code will be stamped on one side of the tire, near the bead area. This tire identification number will start with the letters DOT, then the next two numbers or letters are the plant code where the tire was manufactured....
    view full answer...
  • Replacement Upgraded Tire Size to Replace a 5.30-12 Tire on a 1987 Jayco Pop-Up Camper
    I would go with an ST145-R12 Load Range E tire to replace your current 5.30-12 tires. This is a tire size that is slightly wider and taller than what you currently have that has higher capacities and are available in radials which are better than bias-plies. For a tire I would go with the Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E # AM10140. This tire has a 1,520 lb capacity when inflated to 80 psi. At the maximum air pressure, the tires will perform and wear best, and...
    view full answer...
  • Will a ST145/80R12 Trailer Tire Replace a 4.8-12 Trailer Tire
    Yes, 4.8-12 trailer tires and ST145/80R12 tires are both designed to fit a 12 inch diameter rim that is 4 inches wide. The only thing you will need to consider is vertical clearance. The Karrier S-Trail ST145/R12 Radial Trailer Tire # AM10140 that you referenced will be a little less than an inch taller. So if you have a fender above the tire you will need to consider this change in clearance. I attached an FAQ on trailer tires for you to check out also.
    view full answer...
  • Will ST145R12 Tires Work in Place of 5.30-12 Tires for a Pontoon Boat Trailer
    If you used 4 of ST145/R12 trailer tire # AM10140 the combined capacity would be 6,080 pounds. That is more than enough for the stated 4,200 pounds of your boat and trailer. The 145R12 and 5.30-12 have almost the same dimensions so clearance should not be an issue either.
    view full answer...
  • Troubleshooting 12 Inch Trailer Tires that Have Worn Out After 1,000 Miles
    Without knowing more about how the tires are wearing and what tires you have it's hard for me to say why your trailer tires are wearing like they are. It doesn't sound like they are overloaded so the first thing I would check is the tire pressure. Trailer tires should always be inflated to their max psi to ensure they get the max amount of mileage for the tires. Another place I would look is at the suspension components of your trailer. Worn out suspension can cause tires to wear strange....
    view full answer...
  • Need New Tires for a Trailer Hauling 2,500 to 2,800 lbs with 4.80 x 12 Tires
    A 4.80 x 12 trailer tire fits on a 12 inch x 4 inch wheel, so I would guess that is the size of your wheel. The size of the wheel is important when choosing replacement tires. The highest capacity tire that we carry for a 12 inch x 4 inch wheel is the Kenda Karrier S-Trail ST145/R12 Load Range E Trailer Tire, # AM10140. This tire has a weight capacity of 1,520 lbs at 80 psi. Two of them would have a weight capacity of 3,040 lbs. Keep in mind, increasing the weight carrying capacity of...
    view full answer...
  • Will 145/80-12 Trailer Tires Fit the Same Wheels as 5.30-12 Trailer Tires
    Trailer tires in sizes 5.30-12 and 145/60-12 (such as # AM10140) both fit the same size wheels so you could use them. Trailer tire # AM10140 is rated for 1,520 pounds at 80 psi. Please note that higher capacity trailer tires will not increase the capacity of the trailer. Both sizes are basically the same height and width with the 145 being slightly shorter. There should not be any clearance issues so there is no reason not to switch to the 145 size. I have included a couple of helpful...
    view full answer...
  • Looking for 4.80-12 Tires for Jet Ski Trailer
    Actually, 4.80-12 tires are still manufactured and we carry them. We sell the tires only, or the wheel/tire combo with the tire mounted on a wheel with a 4 on 4 bolt pattern or a 5 on 4-1/2 inch bolt pattern. If you click the link I provided, you can see our available tires and wheel/tire combos in that size. If you're getting a wheel/tire, be sure to choose the wheel that matches the bolt pattern of your existing wheels. I'll link you to an FAQ article that shows how to determine your...
    view full answer...
  • Switching From ST5.30-12 Load Range D Tires To ST145R12 Load Range E Tires On Jayco Camper
    I would recommend switching from the ST5.30-12 tire size to the ST145R12 size because the advantages of going to a radial design tire. Because of the construction of a radial tire, the tire has more flex and will allow for more ground contact. That will improve traction and better tread wear. It also gives the radial tire better stability. The radial tire will normally run cooler, if not overloaded, which will help the tire last longer, especially when the tire is under a load. You...
    view full answer...
  • What is the Difference Between the Load Range D and E for the Tire Size ST145R12
    Load range D has a capacity of 1,220 lbs at 65 psi, whereas load range E has a capacity of 1,520 lbs at 80 psi. Basically the only difference between the two is the weight capacity. With trailer tires you always want to have them inflated to their maximum that way you get the best handling, braking and wear characteristics. You should note that if you increase the load capacity of your tires it will not necessarily increase the overall capacity of your setup. You must always go with the...
    view full answer...
  • What is Recommended Tire Pressure for Trailer Tires
    When inflating trailer tires the recommendation is to inflate the tire to the max tire pressure listed on the sidewall when the tires are cold. So if your max pressure is 80 then that is what you would need to inflate to when cold. The increased pressure when hot is normal. Ideally in your situation where the temperature range is so extreme you would inflate the tires while cold in the temperature that they would be cruising in. If you don't inflate to max pressure the tires will not...
    view full answer...
  • Wider Tire Recommendation to Replace 4.80-12 Tire Size
    The widest tire we offer that will fit the same rim as your 4.80-12 tires is going to be a ST145/R12 tire like part # AM10140 which has a section width of 5.7 inches. Overall diameter would be increased by less than an inch. This will give you a tire that is .8 inches wider.
    view full answer...
  • Replacement Tires for 12 Inch Rims on Trailer that is Used on Highways and Off-Road
    Even though you do ride over bumpy roads part of the time I would still stick with radial tires if they're available in the size you need. Bias tires are generally better for off-road conditions but the radials can handle some bumps in the road too. And the advantages of a radial tire on the highway will have a great impact over the bias on rough roads. I've linked our selection of tires that fit 12 inch rims. If you can tell me your exact tire size I can make a more specific recommendation.
    view full answer...
  • Will Kenda ST145/R12 Fit on Same Rim as 4.80-12 Tire
    Both tire sizes you mentioned are designed to fit a 12 inch diameter wheel that is 4 inches wide so yes, the part # AM10140 that you referenced would work well for you.
    view full answer...
  • Recommended Tires For 5x7 Trailer With 12 Inch Wheels For Long Highway Driving
    The 5.30-12 tires fit on a 12 by 4 inch wheel. For your application, I definitely recommend a radial tire over a bias tire. The 90 degree cross belt will give you a better ability to keep traction on highways and will dissipate heat better. The best tire I can recommend for your wheel size is the Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E, # AM10140. This tire will have a speed rating at 65 mph max and a load capacity of 1,520 lbs at 80 psi. The speed rating...
    view full answer...
  • Is The Maximum Load Rating Listed For A Single Tire Or Pair
    Yes, that is correct the Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E part # AM10140 load capacity is per tire inflated to the recommended max PSI. However, some trailer tire manufacturers have a load capacity per pair of tires. This particular tire is rated 1,520 lbs at 80 psi per tire.
    view full answer...
  • Largest Trailer Tire Size for a 12" Wheel on Utility Trailer
    The largest size tire that you can fit on your current wheels is the Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire # AM10140. This has an overall diameter of 21.3" and a section width of 5.7" meaning that it is about 0.5" larger in diameter and 0.8" wider. I can definitely help you to find bigger tires than that if that's what you're wanting but before we can determine the biggest tire you can install I'll need to know how much fender clearance you have as well as how much clearance...
    view full answer...
  • Recommended Radial Tires To Replace 5.30x12 Tires On 1976 Popup Camper
    For the replacement tires on your 1976 popup camper, I recommend the Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E # AM10140. These will be a slightly wider and shorter than your current tires, but will mount to the same wheels. They have a width of 5.7 inches and overall diameter of 21.3, which isn't a very noticeable difference. These tires have automotive grade tread and are rated for 1520 lbs at 80 psi.
    view full answer...
  • Availability of Trailer Tire in Size 145R12
    We have the tire size 145R12 by itself. For that you would want the part # AM10140. I attached a review video for this tire for you to check out as well.
    view full answer...
  • Best Trailer Tire Option for 12 inch Trailer Rim
    Your rim size is actually 12 inch based on the tire size you listed. You probably measured the rim including the mounting lip which adds an additional inch. So the best option we have for a 12 inch trailer rim is the radial tire size 145/R12 like part # AM10140. A radial tire flexes more than a bias tire, giving it better ground contact, traction, stability, and tread wear. A radial tire will normally run cooler than a bias ply tire, especially when the tire is under a load. A tire that...
    view full answer...
  • What Does "Always go With Lowest Rated Component as Towing Capacity" Mean
    I found the statement you mentioned: "You must always go with the lowest rated component in your towing setup as the overall capacity. " This does not mean you have to stick with the Load Range D tire. It just means that if you go with a D and it happens to be the lowest rated component in your setup it would be the overall capacity.
    view full answer...

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