Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  

Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Thread Tools Search this Thread
Old 09-13-05, 12:58 AM   #1
Junior Member
Thread Starter
Join Date: Aug 2005
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
need some help!

I am looking into buying the parts to convert my bike to fixed gear. My bicycle has 126mm spacing in the rear dropouts, and i believe requires a 68mm shell for the BB. I would like to purchase the bulletproof cranks. In order to get a straight chain line what spindle length should i get the BB in? would 107mm be ok? also, will the bulletproof cranks fit any taperd square bb, (for instance the one made by IRO) without any type of conversions etc? And for the final question- I live in san francisco, ride long distances and of course there are lots of hills, whats is good gearing for an area like this?
Muirfield is offline   Reply With Quote
Old 09-13-05, 07:21 AM   #2
jack of one or two trades
Aeroplane's Avatar
Join Date: Jun 2005
Location: Suburbia, CT
Bikes: Old-ass gearie hardtail MTB, fix-converted Centurion LeMans commuter, SS hardtail monster MTB
Posts: 5,637
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
1. Chainline depends on the hub, BB spindle, and crank. You need at least two nailed down in order to determine what you need for the third. And it may take some adjustment/trial and error.

2. Bulletproof cranks AFAIK take the standard shimano taper, which is more than likely what the IRO BB is. Though you can probably find a shimano UN53 or UN73 BB for the same price, and in a variety of spindle lengths. Campy taper is the only other type that I know of, and that's restricted to the more exotic manufacturers like Campy (duh) and Miche.

3. Gear ratios are all over the place. You'll probably hear that a 44/16 or thereabouts is pretty good. Try it, and if you don't like it see if you can trade your cog or chainring with somebody.

Good luck.
Aeroplane is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -6. The time now is 07:28 AM.

  • Ask a Question
    get answers from real people!
Click to start entering your question.