How to Adjust Shims for Rear Wheel Torsion Beam Tire Wear?
2 Answers
After disassembling both ends, connect them to the inner hub of the wheel. Adjust the support steel screws, then increase or decrease the thickness of the shims either forward or backward until the angle is properly adjusted.
I've dealt with many tire wear issues caused by torsion beam rear suspensions, and adjusting shims is a key step. First, observe the tire wear pattern. If the outer edge is excessively worn, it usually indicates excessive toe angle, requiring thinner shims; if the inner edge is severely worn, thicker shims are needed. I use a laser alignment tool to measure the current suspension parameters, then remove the wheel and the torsion beam connection point to install the appropriate shims, ensuring precise alignment. When doing it yourself, make sure to have all the necessary tools ready, such as a torque wrench and a set of shims with different thicknesses, and don't forget to mark the positions to avoid incorrect installation. After adjustment, drive a few dozen kilometers and check the wear changes again. Also, remember to check tire pressure and balance, as these issues can easily worsen tire wear. If the wear is too uneven, it's safer to just replace the tires. The whole process requires careful attention, and avoid making too large an adjustment at once to prevent uneven suspension stress.
