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 08-05-08, 11:03 AM   #1
canam73
Senior Member
Thread Starter
 
Join Date: Jun 2007
Location: Haunchyville
Bikes:
Posts: 6,374
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Need Shimano Front Derailleur Help

I am building up a road bike for my wife and plan using a R600 compact crankset (50/34) with a SRAM 9-speed cassette. I recently ordered Tiagra derailleurs from Nashbar to complete the drivetrain. This is the front that I ordered:

http://www.nashbar.com/profile.cfm?c...t%20Derailleur

mainly because it said it was compact crank compatiple and had a multi-clamp that should work with the 31.8mm seat tube. But when I received it and opened it up it looked completely different than the picture, the clamp was for a 34.9mm tube and there were no shims or other provision to make it properly fit a smaller tube. Also, the instruction specifically list the maximum chainring difference as 15 or less, not the 16 that my (and most other?) compacts have.

I called Nashbar and talked to a tech who told me that 1)The picture on their website for that product is wrong and that the double which I need is longer slender like the one that I received. 2) They forgot to send the shims and he would send a set right out. And 3) that the one they send would in fact work fine with a 16t chainring spread.

So can anyone confirm or deny what I have been told? I don't have the rest of the parts yet to actually test it out.

Thanks, Steven.
canam73 is offline   Reply With Quote
Old 08-05-08, 01:11 PM   #2
Al1943
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Bikes: Trek 5500, Colnago C-50
Posts: 9,433
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If she has shifting problems a good alternative may be to replace the 50t big ring with a 48 or 49 (110 BCD).
Al1943 is offline   Reply With Quote
Old 08-05-08, 01:51 PM   #3
maddmaxx 
Small Member
 
maddmaxx's Avatar
 
Join Date: Nov 2003
Bikes: Leader home built hardtail, Diamondback Response
Posts: 7,136
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 132 Post(s)
It will work fine with the 16 tooth spread.

1. Shimano is very conservative with their max ratings which can almost always be beated by a tooth or 2

2. Shimano came late to the compact crankset party and took the time to make a crankset that was spec'd to work with the existing Shimano derailliurs without problem. Some of the other early compact cranks worked best with a special derailleur for the 16 tooth spread.

I believe that once you have the shims that you will be good to go.
__________________
We are an empire. Use it wisely.
maddmaxx 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 11:34 AM.