My ebike motor's rim is an absolute pain to mount tires on. I know that it's a problem with the rim itself since I've put my exact same tires on another rim with much less effort. Potential DIY defects aside, Is it feasible to grind down my rim to decrease its diameter? I'd rather not spend money on a new rim and service to re-lace my motor.

Edit: The rim in question is the Sun Ringle Rhyno Lite 26x2.00 with 36 holes.