This is non-negotiable. If you try to use this on a clean garage floor without bolting it to a plate or the concrete, the entire unit will tip over the second you apply leverage. You need a dedicated 2'x2' piece of 3/4" plywood or lag bolts into the floor.
For changing standard 14"–17" steel rims and heavy truck/tractor tires, it is a beast for $70. For trying to mount a 20" low-profile run-flat onto an Audi, it is a recipe for bloody knuckles and a bent rim. companion hdtc
Because you turn the wheel by hand using the pry bar, you have total feel for what the rubber and rim are doing. You won't accidentally gouge an alloy wheel with a power arm. For steel wheels, it’s practically foolproof. The Bad (Cons) 1. The "Duck's Head" is Clunky The tool uses a traditional "duck's head" (the wedge that goes between the tire and rim) attached to a long pry bar. It works, but it requires significant upper body strength. Mounting low-profile tires (45-series or less) on this machine is an act of willpower—and sometimes a few choice words. This is non-negotiable