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

Thread Tools Search this Thread
Old 08-18-11, 03:22 PM   #1
Thread Starter
Join Date: Aug 2011
Location: Ireland
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Identifying my Shimano groupset - and upgrading cassette.

My triathlon bike - bought 2nd hand about 10 years ago for 1,200 - has a Shimano Dura-Ace group-set. The cassette has 9 cogs: smallest 12, biggest 23.

I'm trying to find out if I can upgrade to a 10 cog cassette will keeping the same rear derailleur and brake/shifters. I think it's a 7700 group-set.

Coolmain is offline   Reply With Quote
Old 08-18-11, 03:36 PM   #2
Senior Member
Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
Posts: 4,844
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 44 Post(s)
No, if you want to keep your current shifters, and go 10 speed, it's not possible; as the rear shifter doesn't have enough clicks / positions. You will probably find it easier / cheaper to get a new bike if you want 10 speed.
jimc101 is offline   Reply With Quote
Old 08-18-11, 07:14 PM   #3
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: 28,982
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 124 Post(s)
You can keep your rear derailleur since 9-speed Dura Ace is compatible with other and newer groups. You will need new shifters as jimc101 explained and, unfortunately, brifters are the most expensive single item. You could save a fair bit of money by using 105 or Ultregra brifters unless you insist on Dura Ace.
HillRider is offline   Reply With Quote
Old 08-19-11, 12:31 PM   #4
Collector of Useless Info
Join Date: Aug 2009
Posts: 1,408
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If it's a tri-bike, it probably has bar-end shifters. Bar-end shifters usually have a friction mode, but running 10-speed friction mode takes a very steady hand to align the rear derailleur well enough on every shift to keep it from ghost-shifting. In practice, friction shifting is for 8 speeds or less. You'll need new 10-speed shifters, but the derailleurs are probably OK.
cycle_maven is offline   Reply With Quote

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 08:52 PM.