Why is the rear wheel of a scooter wobbling?

[OHarmony]

For a wobbling rear wheel, check the following aspects separately: whether the tire pressure is insufficient, whether the rear axle nut is loose, whether the tire has bulges or is improperly installed and twisted, whether the rear shock absorber is too soft, whether the rear wheel bearings are damaged, and whether the rear rim is deformed. The related explanations are as follows: 1. Inspection items: If it is a pedal-assist scooter, also check whether the engine mounting bracket bushings are aged and loose. If it is a underbone or straddle-type scooter, check whether the rear swing arm screws are loose or the swing arm bushings have excessive clearance. 2. Hand test: For a scooter's rear wheel, you can feel slight front-to-back movement by gently pulling it with your hand (this is actually not the wheel's looseness), but there should be no side-to-side movement. If the rear wheel appears to wobble side to side, check whether the tire has bulges or is twisted. Aluminum wheels generally do not deform.