Is it necessary? I'm trying to mount a 49cc engine on it. It seems like I could just put some longer bolts on there, and it would be fine. I have $0 budget for this project, so I'm trying to find some workarounds on that. Any suggestions? Also, the stock Fat Cat tire on the back - does it last any longer than any other wheels unaided? I do have a replacement that I could fortify and use if necessary, so I'm just curious if I'll need to go get it, lol.