How to Check for a Bent Trailer Axle Spindle
Updated 08/25/2026 | Published 05/22/2014 >
Question:
Other than by looking, is there a way to measure or determine with some level of precision if a welded on spindle is bent? I think maybe I can take a carpenters speed square and put it on the spindle and the other side against the brake drum backing plate and that will give me a pretty good idea if its bent. Any ideas? Thanks.
asked by: Mark
Expert Reply:
Assuming your tires are in good shape without any bulges the easiest way to determine if you have a bent spindle is to take a straight edge that is longer than the tire and lay it across the tire parallel with your trailer frame and then measure the distance from the frame to the straight edge in front and back of the tire. If the distance is the same then the spindle isn't bent.
Beyond that your best option would be to take the trailer to someone qualified in trailer repair to have them check the spindle alignment.

Cliff M.
8/25/2026
What if the tire wear is on inside of tire? Wouldn't the spindle be bent inward? If so the measurement would be the same on each end of tire to frame? My spindle is scored on the inside toward backing plate. Spindle could still be straight not bent?

Product Page this Question was Asked From
Square BT8 Spindle for 2,000-lb Trailer Axles - 1-1/2" Wide
- Trailer Spindles
- Standard Spindle
- Without Flange
- L44643
- 1-1/2 Inch Diameter
- Square
- For 2000 lb Axle
- TruRyde
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Greg D.
2/6/2020
I have a Midwest boat trailer that keeps wearing the inside tread of the right tire only left side wears perfect, I do have a kicker motor on the right rear of my boat any thoughts, my thinking is that the axle must be bent is there any way of checking this