sorry to respond so late. I have never replaced those bearings, mine were still good when I traded the moto 4 away. If they are pressed on, then I bet you would have to buy, or rent a puller. How to find one the right size I don't know. Wish I had some good info for you. Sorry. There is a salvage yard in Houston with motorcycle and I think atv's and parts . Not sure they would have what you need, but if you want to try, here is the info "Annie's Cycle Sales and Salvage" 11353 Eastex Freeway
(281)442-7056.
markc