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 02-13-04, 08:11 PM   #1
cycletourist
opinionated SOB
Thread Starter
 
cycletourist's Avatar
 
Join Date: Jul 2000
Location: Branson, Missouri USA
Bikes:
Posts: 968
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Can a 7 speed rear derailleur handle 8 cogs?

I am building a new road bike with an 8 speed wheel and I want to cannibalize whatever I can from my old 3x7 hybrid. Can I use the rear derailleur or will it not handle an 8 speed cassette? Indexing won't be an issue because I am using bar end shifters in friction mode.
cycletourist is offline   Reply With Quote
Old 02-13-04, 09:39 PM   #2
SteveE
Veni, Vidi, Vomiti
 
SteveE's Avatar
 
Join Date: Jun 2002
Location: Republic of Anaerobia
Bikes: Serotta Legend Ti, Romani Columbus SL, Soma Doublecross
Posts: 3,582
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Cycletourist,

Can you measure the distance between the smallest and largest cogs on the two cassettes? If the distance is the same between the two, I wouldn't think you'd have any problems as long as you're using friction shifters
SteveE is offline   Reply With Quote
Old 02-13-04, 09:50 PM   #3
Rev.Chuck
The Red Lantern
 
Rev.Chuck's Avatar
 
Join Date: Apr 2003
Location: Raleigh NC
Bikes:
Posts: 5,965
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If you are friction shifting, you should have no problem
__________________
Are you a registered member? Why not? click here to register. Its free, and only takes 27 seconds!
Help out the forums, abide by our community guidelines.

I am in the woods and I have gone crazy.
Rev.Chuck is offline   Reply With Quote
Old 02-13-04, 10:18 PM   #4
dafydd
JRA...
 
Join Date: Oct 2003
Location: philly
Bikes: trek 520 & 736, DeRosa Professional, Fuji Professional, Raleigh International 3-speed, Saronni (any info people?), Humber 3-speed, Raleigh Sports, Carlton Grand Prix coming soon!
Posts: 839
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I gave my housemate suntour retrofriction barcons and a cyclone mkII derailleur--which he shifts over a 9-speed cassette. comes a little close to the spokes but otherwise it works fine.
dafydd is offline   Reply With Quote
Old 02-13-04, 10:30 PM   #5
sch
Senior Member
 
Join Date: May 2003
Location: Mountain Brook. AL
Bikes:
Posts: 3,086
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 42 Post(s)
I used a '70s era five speed rear der on an STI equipped 8spd without any trouble when I retroed a PX 10 with a cast off 8spd setup. (Fr der also worked
til it broke a screw out of a casting and was replaced.) Steve
sch is offline   Reply With Quote
Old 02-13-04, 10:47 PM   #6
madpogue
My own worst nightmare
 
Join Date: Jan 2004
Location: Madison, WI USA
Bikes:
Posts: 1,237
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I would think that even with indexed shifting, you should be okay. The detents are always in the shifter, whether it's STI/RSX, grip, crapid-firer, thumb-top or whatever. Those detents correspond with the position of each cog. As was said, if the derailleur has sufficient range, and can handle the range of cog sizes, you should be good to go.
madpogue 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 12:01 PM.