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 12-14-03, 09:12 PM   #1
nabwong
Senior Member
Thread Starter
 
nabwong's Avatar
 
Join Date: Nov 2003
Location: Somerville, MA
Bikes: Trek 7000, KHS Comp fz 1995
Posts: 60
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Has anyone combined a 9spd crank and 7 spd rear successfully?

Right now i'm running a rear 7 speed set up. HG70 cassette and chain, with STX components. And recently i just bought a XT mega 9 crank. The question is, has anyone successfully combined a 9speed crank and 7 speed rear successfully? If not, i think i'll have to upgrade the rest of the bike. Getting the crank soon, so i'll let you know if i'm successful.

What do you all think?
nabwong is offline   Reply With Quote
Old 12-14-03, 09:39 PM   #2
nabwong
Senior Member
Thread Starter
 
nabwong's Avatar
 
Join Date: Nov 2003
Location: Somerville, MA
Bikes: Trek 7000, KHS Comp fz 1995
Posts: 60
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ok, This could be an answer. Is there a 7spd cassette that is thin enough for use with a 9spd chain? Or can we use a 9spd cassette minus 2 of the gears?

Please help me resolve my foolishness!
nabwong is offline   Reply With Quote
Old 12-15-03, 01:44 AM   #3
rancid_chicken
Senior Member
 
rancid_chicken's Avatar
 
Join Date: Dec 2003
Location: Cookeville, TN
Bikes: Cannondale 1FG, older Cannondale F-500, Custom F-600 Cannondale, Masi Gran Corsa, and a steel bike hand built by my father
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
One of my friends uses a nine speed rear hub, crank, and deraillures with a spaced seven speed cassette and thumb shifters. He has had no problems but is thinking of finally making the change to eight speed due to a short supply of seven speed shifters.
rancid_chicken is offline   Reply With Quote
Old 12-15-03, 06:52 AM   #4
mrfix
Senior Member
 
Join Date: Apr 2002
Location: mass
Bikes:
Posts: 942
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I install 9 speed cranks on 7 and 8 speed system all the time, they shift great, just use a quality 9 speed shimano chain and you won't have any issues. Teh systems work well together.
mrfix is offline   Reply With Quote
Old 12-15-03, 07:54 AM   #5
nabwong
Senior Member
Thread Starter
 
nabwong's Avatar
 
Join Date: Nov 2003
Location: Somerville, MA
Bikes: Trek 7000, KHS Comp fz 1995
Posts: 60
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks guys, you make me feel a lot better. HAHAHA!
nabwong is offline   Reply With Quote
Old 12-15-03, 07:56 AM   #6
nabwong
Senior Member
Thread Starter
 
nabwong's Avatar
 
Join Date: Nov 2003
Location: Somerville, MA
Bikes: Trek 7000, KHS Comp fz 1995
Posts: 60
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
So what's the best 9 speed chain?
nabwong is offline   Reply With Quote
Old 12-15-03, 11:11 AM   #7
mrfix
Senior Member
 
Join Date: Apr 2002
Location: mass
Bikes:
Posts: 942
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
CN-7701 shimano, 6.6mm wide with hardened pins. Nothing shifts or improves shifting on a shimano system more.
mrfix is offline   Reply With Quote
Old 12-15-03, 05:21 PM   #8
miamijim
Senior Member
 
miamijim's Avatar
 
Join Date: Aug 2003
Location: Tampa, Florida
Bikes:
Posts: 13,291
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 45 Post(s)
In general front cranksets are not 7,8, or 9-speed specific. They're either doubles or triples. As all above have mentioned...it'll work fine.
__________________
WWW.CYCLESPEUGEOT.COM 1984 Schwinn Paramount; 1987 Schwinn Paramount; 1975 Tom Ritchey, 198X Vitus
miamijim is offline   Reply With Quote
Old 12-15-03, 08:49 PM   #9
nabwong
Senior Member
Thread Starter
 
nabwong's Avatar
 
Join Date: Nov 2003
Location: Somerville, MA
Bikes: Trek 7000, KHS Comp fz 1995
Posts: 60
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for all the help guys. Basically, i always freak out. I should be getting my crank in a couple of days and will update the outcome. Yeah, I found some websites saying that all i need is a nine speed chain and that should work.
nabwong is offline   Reply With Quote
Old 12-17-03, 02:37 PM   #10
stumpjumper
Lagomorph Demonicus
 
stumpjumper's Avatar
 
Join Date: Sep 2001
Location: Dayton, Ohio, USA
Bikes:
Posts: 791
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
stick with your 7-speed chain if your keeping a 7-speed rear. I ran a 9 speed xt crank / 7 speed stx rear for almost two years with no problems at all.

A crank is a crank.
stumpjumper is offline   Reply With Quote
Old 12-17-03, 04:19 PM   #11
Avalanche325
Senior Member
 
Avalanche325's Avatar
 
Join Date: Apr 2003
Location: Pasadena, CA
Bikes: Litespeed Firenze / GT Avalanche
Posts: 3,162
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I would think a seven speed chain would be better.
Avalanche325 is offline   Reply With Quote
Old 12-21-03, 07:14 PM   #12
meb
Senior Member
 
meb's Avatar
 
Join Date: Aug 2003
Location: arlington, VA
Bikes:
Posts: 1,745
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by miamijim
In general front cranksets are not 7,8, or 9-speed specific. They're either doubles or triples. As all above have mentioned...it'll work fine.
The 9 speed cranks have slightly narrower teeth for optimal derailment of the narrower chain on and off the chainrings and the chainrings are spaced slightly closer for faster shifting with the narrower chain. Going in the direction you are, you are less likely to notice the difference than someone going the other direction. Most people going in the opposite direction of you find the shifting change tolerable. You should be able to keep the same indexed shifters up front, just less tolerance in the calibrations than with shifters designed for 9 speed chainring intervals. The worst problem you would have with the off size Chainrings is SLIGHTLY rougher shifting. And you will get a slightly better Q-factor.

Id stay with the wider chain since the tighter spaced cassette is apt to be more temperamental with the off size chain than the chainrings.
meb 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 08:28 AM.