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


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 04-09-11, 11:55 AM   #1
finsfree
Member
Thread Starter
 
finsfree's Avatar
 
Join Date: Oct 2009
Location: West Palm Beach, Fl
Bikes: Working on it...
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Going form a triple chainring to a double

Hello,

My bike come originally with a triple chainring crank. Could I change to a double chainring crank without doing to much modifying?

As far as modifying though, I am guessing I will have to buy a new bottom bracket (one that will work with the new crank that I get) and do some adjusting to the front derailleur?

Correct me if I am wrong....
finsfree is offline   Reply With Quote
Old 04-09-11, 12:07 PM   #2
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 29,660
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 217 Post(s)
Unless there's an issue of chainring selection, you can simply remove the third chainring. Ideally you'd want to move the crank inboard by about 3mm to correct the chainline difference (assumes it was right in the first place), but in many cases it isn't necessary.

If you do replace the crank, you may or may not need to replace the bottom bracket or spindle depending on what the new crank calls for.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 04-09-11, 12:53 PM   #3
finsfree
Member
Thread Starter
 
finsfree's Avatar
 
Join Date: Oct 2009
Location: West Palm Beach, Fl
Bikes: Working on it...
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by FBinNY View Post
Unless there's an issue of chainring selection, you can simply remove the third chainring. Ideally you'd want to move the crank inboard by about 3mm to correct the chainline difference (assumes it was right in the first place), but in many cases it isn't necessary.

If you do replace the crank, you may or may not need to replace the bottom bracket or spindle depending on what the new crank calls for.
Gotcha! Thanks!
finsfree 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 12:30 PM.