Author Topic: 2 questions about my new school bike.. (Read 761 times)

lk_97 · « **on:** November 28, 2009, 09:13 AM »

1. my bike has a us bb so if i kept the us bb in and took a crank from a bike that had a mid bb would the crank fit through the us bb?
2. My bike also has brake lugs, what brake do i need to fit them?
Thanks.

Dark Diggler · « **Reply #1 on:** November 28, 2009, 09:19 AM »

What frame is it ? and what cranks are they (to help id the spindle size as there are 3 sizes)

lk_97 · « **Reply #2 on:** November 28, 2009, 10:03 AM »

Its a diamondback 3 peice crank and a fit logic with a profile bb
Thanks

Gary72 · « **Reply #3 on:** November 28, 2009, 10:16 AM »

All a MID BB is, Is an Americam BB without the cups. So just swap the whole MID BB crank into the US cups

HEYWOOD BMX · « **Reply #4 on:** November 28, 2009, 10:18 AM »

You`ll need a u-brake,loads available from any decent BMX shop.You`ll need to know the spindle size,ie a 19mm spindle will need a 19mm bottom bracket.Some Diamondback cranks have a 20mm spindle.Can you get the bearings with the DB crank and see if they fit into the cups one Profile bottom bracket?