M mekill60 Guest Nov 4, 2009 #3 I recently bought a mirraco bmx bike from a friend, and it has sealed bearings in it. They are really broken and I need a new pair, but I'm unsure of the size. Does anyone know how to tell what size bb I need?
I recently bought a mirraco bmx bike from a friend, and it has sealed bearings in it. They are really broken and I need a new pair, but I'm unsure of the size. Does anyone know how to tell what size bb I need?
R Reece New member Nov 4, 2009 #4 it all depends there is a few diffrent types of bb theres mid,us ect. mid only comes in 19mm and 21mm and it most likley a mid bb
it all depends there is a few diffrent types of bb theres mid,us ect. mid only comes in 19mm and 21mm and it most likley a mid bb
