Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Largest cog for Shimano 10 speed compact?

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.

Largest cog for Shimano 10 speed compact?

Old 05-25-10, 01:14 PM
  #1  
FinanceGuy
Senior Member
Thread Starter
 
Join Date: Dec 2005
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Largest cog for Shimano 10 speed compact?

What is the largest workable cog (higher than the stock 28) with an Ultegra 6700GS rear derailleur and 50-34 crankset?

Will an IRD 12-30 or 12-32 cassette work?

Thanks
FinanceGuy is offline  
Old 05-25-10, 01:32 PM
  #2  
dperreno
Senior Member
 
Join Date: May 2008
Location: Beverly Hills, MI
Posts: 590

Bikes: '72 Fuji Finest, '80 Austro-Daimler Inter 10, '06 Fuji Team Issue, '06 Salsa Las Cruces, Nashbar Frame single speed

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The GS seems to have enough wrap capacity (39T), but the jockey wheel may bump on the 30/32T rear cog. You can probably fix this by using a longer B-screw or reversing your B-screw http://www.parktool.com/repair/readhowto.asp?id=64
dperreno is offline  
Old 05-25-10, 02:41 PM
  #3  
Al1943
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Posts: 9,438

Bikes: Trek 5500, Colnago C-50

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The answer to your question depends partially on the derailleur hanger specific to your bicycle. Most Shimano road derailleurs can handle up to a 30t cog. Some folks have reported using a 32, while others have had problems with a 30.
Al1943 is offline  

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.