1. the back wheels just come off to remove them from the axle id hold them with pliers and tist them until loose
2. ive never personally bought magnets but ive heard theyre a waist of money
3. usually when i to put big wheels on all i do is superglue them onto the original rims, this is really easy to do but if u dont do it right the wheels will wobble a lot
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I HATE XMODS (when they're broken...like mine)