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

Reply
 
Thread Tools Search this Thread
Old 12-30-12, 09:34 PM   #1
foxandsticks
Junior Member
Thread Starter
 
Join Date: Dec 2012
Bikes:
Posts: 16
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Determining a Straight Chainline

I have a wheelset on the way for the fixed gear I'm building, and I may replace the BB and crankset on this bike as well.

The BB's I'm looking at come in an array of sizes and I'm guessing it's possible to get one that would give me a perfectly straight or close-to chainline. How would I go about determining the right size BB?

Thanks
foxandsticks is offline   Reply With Quote
Old 12-30-12, 09:37 PM   #2
Wil Davis
Curmudgeon
 
Wil Davis's Avatar
 
Join Date: Aug 2005
Location: Nausea, New Hamster
Bikes: (see http://wildavis.smugmug.com/Bikes) Bianchi Veloce (2005), Nishiki Cascade (1992), Schwinn Super Sport (1983)
Posts: 1,572
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Check Sheldon Brown's web-site, also Park Tools site. Both go into enough detail that you should have no problem finding a solution! Good luck!

- Wil
Wil Davis is offline   Reply With Quote
Old 12-30-12, 09:39 PM   #3
Spoonrobot 
Senior Member
 
Spoonrobot's Avatar
 
Join Date: Jul 2006
Bikes:
Posts: 1,607
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 52 Post(s)
A quality crankset will have a recommend or included bottom bracket.
Spoonrobot is offline   Reply With Quote
Old 12-31-12, 07:55 AM   #4
Scrodzilla
There goes Tokyo
 
Scrodzilla's Avatar
 
Join Date: May 2009
Location: San Diego, CA
Bikes: EAI Bare Knuckle, 1975 Raleigh Pro Track
Posts: 26,565
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
Quote:
Originally Posted by Spoonrobot View Post
A quality crankset will have a recommend or included bottom bracket.
+1

What crankset will you be using?
__________________
__________________________________
Scrodzilla is offline   Reply With Quote
Old 12-31-12, 03:42 PM   #5
foxandsticks
Junior Member
Thread Starter
 
Join Date: Dec 2012
Bikes:
Posts: 16
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Well I'm hoping to use the crankset and BB that came on the bike, but I'm not sure how well it will line up, and I haven't counted the number of teeth on the gear. If it's not possible to use it then I was going to either scavenge around the bike co-op or find a cheap one online.

I was just wondering if you could calculate how the rear cog and crankset gear would line up.
foxandsticks is offline   Reply With Quote
Old 12-31-12, 03:54 PM   #6
FakeFuji
Senior Member
 
FakeFuji's Avatar
 
Join Date: Nov 2011
Bikes:
Posts: 657
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If you measure the distance from on side of the bb shell to the chainring then subtract 34 you will know the spacing of that, then do basically the same for the cog, and if your measurements are good youll have a general idea
FakeFuji is offline   Reply With Quote
Old 12-31-12, 06:02 PM   #7
Mumonkan
Brown Jersey Winner
 
Mumonkan's Avatar
 
Join Date: Apr 2012
Location: The Bad Woods.
Bikes:
Posts: 8,665
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 64 Post(s)
http://sheldonbrown.com/chainline.html
Mumonkan is offline   Reply With Quote
Old 01-01-13, 05:57 AM   #8
Bat56
Senior Member
 
Bat56's Avatar
 
Join Date: May 2010
Location: St.Paul, MN
Bikes:
Posts: 1,733
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Mumonkan View Post
Holy **** that's amazing! How did you find that? Is that wonderful information really free?
Bat56 is offline   Reply With Quote
Reply


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 12:10 AM.