Cordless Angle Grinder Tool 4-1/2 inch, 20V Battery Grinder Kit, Brushless Power Angle Grinders with 2x4.0Ah Batteries, 3 Variable Speed Grinder with 35PCS Accessories for Metal Cutting, Grinding

Exactly what I'm doing with mine as we speak. Thankfully its isolated to the edge of the rim, so pick up an angle grinder off of Amazon (I got this one, and it works great "Cordless Angle Grinder Tool 4-1/2... https://www.amazon.com/dp/B0FX33SC53?ref=ppx_pop_mob_ap_share'). The rims are soft aluminum so with a little patience, and the method @AlarmedAd said, your rims will be good as new in no time