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 12-28-06, 02:35 AM   #1
PartyPat
UBIQUE
Thread Starter
 
PartyPat's Avatar
 
Join Date: Feb 2006
Location: Perth, Australia
Bikes: Avanti Giro, Avanti Barracuda
Posts: 87
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Chain Length

I'm replacing my rear cassette from a 13-25 to a 12-27. Replacing the chain and large chainring at the same time too. Due to the change in the new cassette range, do i need to change my chain length from it's original no of links or do I keep it the same?

Cheers
PartyPat is offline   Reply With Quote
Old 12-28-06, 03:34 AM   #2
Phoible
Senior Member
 
Join Date: Jun 2006
Bikes:
Posts: 159
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You will need a slightly longer chain. Use one of the sizing methods on the Park Tool or Sheldon Brown's website. The easiest thing to do is to wrap the chain around the largest cog and the largest chainring, and add one full link to that length.
Phoible is offline   Reply With Quote
Old 12-28-06, 07:13 AM   #3
capwater
Senior Member
 
capwater's Avatar
 
Join Date: Dec 2004
Location: Quahog, RI
Bikes: Giant TCR Comps, Cdale R5000, Klein Q-Pro, Litespeed Siena, Piasano 105, Redline Conquest Pro, Voodoo Bizango, Fuji Aloha
Posts: 1,509
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Slap it on and go. Couple teeth are no big deal. I routinely swap cassettes from 12-25 (training) to 11-21 (racing) with no ill effect. Unless your chain was on the short end originally for the 13-25, the 12-27 will be fine. You shouldn't be crosschaining in the 53-27 anyway.
capwater is offline   Reply With Quote
Old 12-28-06, 07:30 AM   #4
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'd check it anyways if I were you. There's no guarantee your current chain was correct length to begin with.
operator is offline   Reply With Quote
Old 12-28-06, 07:33 AM   #5
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,776
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
Quote:
Originally Posted by operator
I'd check it anyways if I were you. There's no guarantee your current chain was correct length to begin with.
Absolutely. Cross chaining, particularly big-big, is not recommended but the chain must be long enough to allow it. An inadvertant choice of that gear can do a lot of damage if the chain is too short.
HillRider is offline   Reply With Quote
Old 12-28-06, 07:55 AM   #6
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,543
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 62 Post(s)
So what's the big deal? With a new cassette and new chainring I assume you are getting a new chain anyway because it would be really dumb not to.

Wrap it around the big/big combination bypassing the rear derailleur. Add 1 inch of chain. Done.
Retro Grouch is offline   Reply With Quote
Old 12-28-06, 10:37 AM   #7
Al1943
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Bikes: Trek 5500, Colnago C-50
Posts: 9,433
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by HillRider
Absolutely. Cross chaining, particularly big-big, is not recommended but the chain must be long enough to allow it. An inadvertant choice of that gear can do a lot of damage if the chain is too short.
+1

IF the old chain was the correct length there should be no reason to make the new chain any different. The difference in a 13-25 and 12-27 should not require a chain length change. The two tooth difference between a 25 and a 27 is very small, but one length of chain is an inch, that's a lot.

Al
Al1943 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 06:41 AM.