quote:

Originally posted by matai:
Wife got this bike from a friend for free:

https://tinyurl.com/yy2glv7r

Surprisingly, it took all of 5 minutes after I took the training wheels off for my 5 year old to start riding it around all by his self, I was pretty impressed.

The problem is the bottom bracket keeps getting loose. Both me and his grandpa have tried fixing it multiple times but to no avail. It's just a super crappy open ball bearing design. Even when it's fixed it still grinds and sucks.

I'd just go out and buy a new one from REI or something but am exploring options to fix it.

I measured the outside bottom bracket diameter at 47mm, the width at 58mm and the crank is 123mm.

I can't seem to find any replacement cranksets or bottom brackets. Does anybody have any advice about if there are good replacements or if I'd be better off replacing the whole thing? Also if that's the case, any suggestions? He's got 2 little brothers hot on his heels so we tend to purchase things that will last for 3 boys.

Thanks!