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 07-02-10, 02:15 PM   #1
roccobike
Bike Junkie
Thread Starter
 
roccobike's Avatar
 
Join Date: Jun 2005
Location: South of Raleigh, North of New Hill, East of Harris Lake, NC
Bikes: Specialized Tarmac, Speialized Roubaix, Giant OCR-C, Specialized Stumpjumper FSR, Stumpjumper Comp, 88 & 92Nishiki Ariel, 01 Bianchi Campione, 87 Centurion Ironman, 92 Paramount
Posts: 9,447
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Can I use a Shimano 105, Triple Left shifter with a double crank?

I'm referring to a late model 105. I know that with older triple STI shifters, like RSX and 105, you can set up the triple shifter to work perfectly with a double crank. I've done it several times. However, a freind recently toasted a late model Tiagra triple when using it with a double compact crank. It was a Trek and it came that way from the factory. The bike shop that repaired it said this shifter was not made to work with that crank and they had seen this several times before. BTW, this happened within one year of purchase, still under warranty.
I've got a 06 Giant OCR-C3 with 105 triple left (10 speed). I'm seriously thinking of going from a triple to a compact double. The question is, will this shifter also have problems working with a double or is the problem limited to Tiagra 9 speed left?
Thanks for all replies.
__________________
Roccobike BF Official Thread Terminator
roccobike is offline   Reply With Quote
Old 07-02-10, 05:14 PM   #2
joejack951
Senior Member
 
joejack951's Avatar
 
Join Date: May 2004
Location: Wilmington, DE
Bikes: 1984 Trek 660, 2003 Specialized Hardrock, 2004 LOOK KG386i (RIP), 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2014 Islabikes CNOC 14 (son's)
Posts: 10,366
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 289 Post(s)
The shifter was toasted due to user error, not that the shifter wasn't designed to work with a double. Apparently, so many users made this same error with 105 10 speed shifters that Shimano stopped selling them as double/triple compatible and went back to separate double and triple versions. What your friend, and many others like him, did was attempt to shift past the high stop screw. Due to the somewhat delicate nature of brifters and their ratcheting mechanism, this was enough to break some internal component. If you want to avoid taking this risk, set up the shifter to use the positions intended for a triple's middle and big ring as opposed to the inner and middle ring (Shimano's recommended installation). You'll be able to overshift going down but this will only leave you with a very loose shift cable. Attempting to overshift up will have you pressing against the shifter's internal stops instead of stressing the ratcheting mechansim.
joejack951 is offline   Reply With Quote
Old 07-02-10, 09:27 PM   #3
roccobike
Bike Junkie
Thread Starter
 
roccobike's Avatar
 
Join Date: Jun 2005
Location: South of Raleigh, North of New Hill, East of Harris Lake, NC
Bikes: Specialized Tarmac, Speialized Roubaix, Giant OCR-C, Specialized Stumpjumper FSR, Stumpjumper Comp, 88 & 92Nishiki Ariel, 01 Bianchi Campione, 87 Centurion Ironman, 92 Paramount
Posts: 9,447
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Thanks for the response. I can do that.
__________________
Roccobike BF Official Thread Terminator
roccobike is offline   Reply With Quote
Old 07-02-10, 10:24 PM   #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)
Shimano will warranty your shifter if you **** it up a triple shifter in that fashion.
operator is offline   Reply With Quote
Old 07-03-10, 04:07 AM   #5
cs1
Senior Member
 
cs1's Avatar
 
Join Date: Feb 2004
Location: Clev Oh
Bikes: Specialized, Schwinn
Posts: 6,705
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 33 Post(s)
Campy doesn't have that problem.
cs1 is offline   Reply With Quote
Old 07-03-10, 07:33 AM   #6
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)
Quote:
Originally Posted by cs1 View Post
Campy doesn't have that problem.
Yeah those ergo replacement parts that they make are just for show.
operator 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 09:14 AM.