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Timbren Axle-Less #ASR2KHD504 Suspension Deflection and Distance from Tire to Trailer Frame


Im about to order axles, hub/drums and electric brakes from you. I want to install an Axle-Less system 2000 lb HD 4inch lift, regular tire, #ASR2KHD504 on a Space Trailer bolted directly to the 2x3inch frame members with recommended frame reinforcement. It will carry 15inch tires and it will have brakes. Im trying to determine the resulting tongue height and clearance between tire and frame prior to ordering. I have three questions: 1 I used the formula you provide for determining wheel/tire diameter for an ST205/75R15 tire. How much should I subtract from the ground to spindle distance 13.55 for a tire under a static load? I estimate that I should subtract 1. 2 The specs diagram you provided from Timbren indicates an axle deflection of 1 5/8inch compared to an emptyinch trailer. What does emptyinch mean just the trailer weight or completely unweighted? And does deflectioninch refer to a loaded trailer at maximum axle capacity of 2000 lbs.? My trailer + payload will be typically be 1000-1200 lbs but occasionally more. I assume I should be using the 1 5/8inch deflection couple with answer to #1 to determine frame height above ground. 3 I need to know the side clearance between the above tire ST205/75R15 and Timbren bracket and hence frame/box using a Dexter 10inch hub and drum #84546UC3-EZ for regular 15inch tires, plus brake assembly. What is the clearance distance and how does one determine it? Many thanks!


Helpful Expert Reply:

To determine the distance from the spindle to the ground you basically just need to take the overall diameter of the wheel and tire and divide by two. Since the tire size 205/75-15 is right at 27 inches in diameter the distance would be 13.5 inches. There's probably a small amount of tire compression that would make it more like 13 inches.

The spring deflection of the Timbren kits is the distance between the suspension at a rest with no load on it verse the full capacity on the trailer. So it's basically the full distance the suspension will travel when in normal use.

When the Timbren Axle Less kit part # ASR2KHDS04 is installed the distance from the hub face to the frame of the trailer will be 6 inches. So since trailer wheels have a zero offset that means that exactly half the width of the tire will be on the inside of the hub face. Since the tire size you mentioned has a section width of 8 inches that means 4 inches of clearance would be taken away giving you a total of 2 inches between the tire and the frame of the trailer! This would be an adequate amount of clearance.

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helpful expert reply by:
Jameson C

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