Gravity RC Tire “Break In Bit”

Works exactly as expected for breaking in tires with an impact

Surprisingly centered. I tried to make one of these out of a cheap bit and spare hex and it was so off centered and wobbly, I just decided to buy a real one.

Pro: the shaft appears to be a 4mm grub screw, so you can probably replace it if needed or use a longer one for stadium truck wheels or other deep wheels if the stock shaft is too short.
Con: It comes with a cheap nylock nut that if you need to tighten the wheel down (which i don't), will need a wrench or you could use a nut without the nylon...
A better option would have been a setup station type aluminum thumb nut like the AKA tool, but that one doesn't seem to have a replaceable shaft so I went with the gravity.

Works very good for what it is. However, the 1/4" bit is coated and will not fit a quick connect 1/4 drill. The coating makes the 12mm hex quite tight fitment as well.