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 01-14-08, 06:46 PM   #1
biknbrian
Senior Member
Thread Starter
 
biknbrian's Avatar
 
Join Date: Jun 2007
Location: Pittsburgh, PA
Bikes: BiknBrian brand custom 26 inch commuter trekker, Cannondale F600 Single Speeded MTB, Nashbar Cro-Mo CX, some other bikes and parts that could be made into bikes.
Posts: 352
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Alivio to X-7 rear derailleur help.

Iím trying to replace and old Shimano Alivio rear derailleur with a used SRAM X-7. This is for an old 7 speed mountain bike, but I thought that as long as I continued to use the original 7 speed shifter that the rear derailleur would not matter. However I cannot get the derailleur adjusted properly. If I set the cable on the smallest cog it shifts fine on highest few gears, but does not pull all the way to the lowest, stopping short. If I pull enough cable to get the derailleur to shift into the lowest gear, it will not shift all the way into the highest gears. It seems as if the derailleur does not move far enough. Also the SRAM derailleur is labeled 1:1, but the Alivio has no markings. This is not a stop issue as I can move the derailleur by hand all the way from the smallest to largest gear.

I thought rear derailleurs were pretty much interchangeable as long as the shifter matched the cassette. Am I wrong?
biknbrian is offline   Reply With Quote
Old 01-14-08, 08:15 PM   #2
JiveTurkey
Low car diet
 
JiveTurkey's Avatar
 
Join Date: Aug 2007
Location: Corvallis, OR, USA
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
Posts: 2,407
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The rear derailleurs are NOT interchangeable. SRAM recently started using a new 1:1 cable pull ratio for its better rear derailleurs and right shifters (X-7 included). Their lower-end stuff still uses Shimano's 2:1 standard.

You'll need to either get a new Shimano/compatible RD or SRAM right shifter. Edit: I'm thinking the former route will be easier/cheaper, try a Shimano Deore: http://www.nashbar.com/profile.cfm?c...All%20Products
JiveTurkey is offline   Reply With Quote
Old 01-14-08, 09:23 PM   #3
JanMM
rebmeM roineS
 
JanMM's Avatar
 
Join Date: Jan 2006
Location: In Central IN
Bikes: RANS V3, RANS V-Rex, RANS Screamer
Posts: 13,521
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 52 Post(s)
I've had good shifting with a Deore RD on a 2000 KHS tandem.
SRAM's 1:1 ratio goes back to at least 2000 models.
JanMM is offline   Reply With Quote
Old 01-15-08, 07:31 AM   #4
biknbrian
Senior Member
Thread Starter
 
biknbrian's Avatar
 
Join Date: Jun 2007
Location: Pittsburgh, PA
Bikes: BiknBrian brand custom 26 inch commuter trekker, Cannondale F600 Single Speeded MTB, Nashbar Cro-Mo CX, some other bikes and parts that could be made into bikes.
Posts: 352
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by JiveTurkey View Post
The rear derailleurs are NOT interchangeable. SRAM recently started using a new 1:1 cable pull ratio for its better rear derailleurs and right shifters (X-7 included). Their lower-end stuff still uses Shimano's 2:1 standard.

You'll need to either get a new Shimano/compatible RD or SRAM right shifter. Edit: I'm thinking the former route will be easier/cheaper, try a Shimano Deore: http://www.nashbar.com/profile.cfm?c...All%20Products
Thanks, I'll just reinstall the Shimano which worked fine. I need new wheels at some point and may convert to nine speed with the SRAM shifters then.
biknbrian is offline   Reply With Quote
Old 01-15-08, 07:38 AM   #5
ang1sgt
Senior Member
 
Join Date: Apr 2007
Location: Chili, NY
Bikes: 88 Fisher Gemini tandem, 92 Trek 970, 07 Nashbar Frame, 08 Gary Fisher Paragon
Posts: 733
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The others are spot on with their information. I would like to add that the "X" Series from SRAM are exceptional shifters and are tops in my book. The Bike I built this past Summer I went with all X-7 stuff and I am very pleased. My New GF Paragon uses a full X-9 shifters and derailluers and these are even better.
ang1sgt 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 12:35 PM.