bike building Q 77 Responses

Last post: 1 year, 10 months ago | Thread started: Mar 20, 10, 11:51 a.m.

RespondNew TopicDisable Images

• scottON

  I ordered a new 170mm bontrager crank for my old fuji S.R.R. Frame... I disassembled and removed the old crank assembly to make way for my shiny new gears... The threaded lock rings inside are pretty mashed up and the bearings are ready to fall out. The new crank is a 3-piece with only the arms, gears, and axle included.

  My question is: what parts do I need to purchase to make my new crank sit nicely and spin freely inside the frame?

  I am a total novice trying to figure this thing out but a lack of knowledge has gotten me stuck at this point.

  Mar 20, 10, 11:51 a.m. – Permalink

• sisu

  Go to a bike shop.

  

  You must be logged in to add a note. Login now or register for an account.

  Cancel

  Dog-earMar 20, 10, 11:58 a.m. – Permalink

• detritus

  Not really the most appropriate forum for this kind of query, I'd've thought. Anyway, whenever I'm stuck with something like this, I have a dig through YouTube, as there are a few bike shops/heads who've produced basic tutes for idiots like us.

  http://www.youtube.com/results?s…

  

  You must be logged in to add a note. Login now or register for an account.

  Cancel

  Dog-earMar 20, 10, 12:08 p.m. – Permalink

• boobs

  You need what's called a bottom bracket assembly. And you need to be sure to get one with the correct thread.

  

  You must be logged in to add a note. Login now or register for an account.

  Cancel

  Dog-earMar 20, 10, 12:18 p.m. – Permalink

• nocomply

  try asking on http://www.bikeforums.net/

  

  You must be logged in to add a note. Login now or register for an account.

  Cancel

  Dog-earMar 20, 10, 12:31 p.m. – Permalink

• Tofublock

  http://www.sheldonbrown.com/

  

  You must be logged in to add a note. Login now or register for an account.

  Cancel

  Dog-earMar 20, 10, 1:52 p.m. – Permalink

• freeskihp

  eh, you kind of fucked yourself over. 3 piece cranks are largely intended for BMX frames. As such they come with pretty large diameter, press-in bearings. Road bikes on the other hand use small diameter thread in bearings called a Bottom Bracket that are generally sold separately from the cranks themselves. The bottom bracket is the axle that connects the two arms. Take it to a bike shop but there's a pretty good chance that what you just bought is totally useless

  

  You must be logged in to add a note. Login now or register for an account.

  Cancel

  Dog-earMar 20, 10, 1:57 p.m. – Permalink

• monNom

  you probably need one of these:
  

  

  
  ( 'integrated' bottom bracket bearing cups)

  go to a bike shop, they'll sort you out and get rid of your old bb for you.

  • No.– imadesigner

  

  You must be logged in to add a note. Login now or register for an account.

  Cancel

  Dog-earMar 20, 10, 8:44 p.m. – Permalink