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 05-14-06, 05:28 AM   #1
born2bahick
Official Website Waterboy
Thread Starter
 
born2bahick's Avatar
 
Join Date: Dec 2004
Bikes: a lot
Posts: 3,271
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ultegra double Question

I did a search and didn't find what I'm looking for, I have an ultegra ten speed double, had thought about a compact crank but was wondering if I could just get a smaller chainring to replaced the 39 tooth ring? if so should i expect shifting problems by going to a 53 34 setup? wondered if it was possible or if anyone has done it with sucess?
born2bahick is offline   Reply With Quote
Old 05-14-06, 05:33 AM   #2
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Posts: 26,908
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 209 Post(s)
Take a good look at where the bolt holes are on your 39 tooth chainring. You'll realize that putting a smaller diameter 34 tooth ring on your crank just isn't possible.
Retro Grouch is offline   Reply With Quote
Old 05-14-06, 05:40 AM   #3
phillybill
Senior Member
 
Join Date: Aug 2004
Location: phlia
Bikes: paratrooper, bullhead, cdale bad boy
Posts: 819
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
38 is about as low as they make them for a 130 BDC, and I have a site that made a 37 but the bolts were placed high into the teeth. If you want to do something like a 53 / 34 you need to look at a compact crank with a compact front dr to make the shift difference. Go look at the Road thread....they have lots of compact crank advice.
phillybill is offline   Reply With Quote
Old 05-14-06, 09:20 AM   #4
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: 29,116
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 179 Post(s)
Shimano now has an Ultegra level compact crank (50x34) that uses the same bottom bracket as the normal double and will work with the standard double front derailleur.

As noted, 38T is the smallest commonly available ring that will fit the 130 mm bolt circle on your crank and the change from 39 to 38 is insignificant.
HillRider 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 11:08 AM.