Choosing a Replacement 3,500 lb Idler Axle for a 7x12 Enclosed Trailer
Updated 11/13/2025 | Published 10/23/2025
Question:
i need a 3500lb idler axle for a 7x12 enclosed trailer. which one do i need?
asked by: Andrew T
Expert Reply:
Hey Andrew!
Knowing the weight capacity of your axle is definitely a start, but I'll also need to know the hub face and spring center dimensions, which you can see in the attached photo as well as the video I'm linking about finding the right trailer axle.
For an axle system that works without knowing that information we have the Timbren Axle-Less Trailer Suspension w Idler Hubs # A35RS545, but this means you're swapping out your suspension as well. If you want to go this route, great! But if you want to stick with a standard axle, just get me those dimensions and I'll be more than happy to help you find what you need!
What happened to your old axle?
(click to enlarge)
Product Page this Question was Asked From
Timbren Axle-Less Trailer Suspension w Idler Hubs - Standard Duty - No Drop - 5 on 4-1/2 - 3,500 lbs
- Trailer Axles
- Rubber Spring Suspension
- Standard Grade
- Idler Hubs
- 3500 lbs
- 5 on 4-1/2 Inch
- Universal Fit
- No Drop or Lift
- Timbren
more information >
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Jon G.
11/13/2025
Hey Andrew, did you end up going with the Timbren Axle-Less suspension for your 7x12 trailer or find a standard axle once you had the measurements? Your update could make it easier for the next person trying to match an axle to their trailer.