Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 03-06-05, 04:24 PM   #1
Peek the Geek
is slower than you
Thread Starter
 
Peek the Geek's Avatar
 
Join Date: Jan 2005
Location: WI
Bikes: Gunnar Sport, Marin Pine Mountain, Gunnar Ruffian, Gunnar Roadie, BMC Fourstroke, Salsa Vaya
Posts: 1,486
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Road vs mtb vs mix derailleurs

Excuse the very basic question, but... Checking out various cycloscross bike specs, I see quite a few with a road-type front der. and a mtb type rear der. Just wondering what the benefits are of using a mixed setup, and why do some choose to do all road components or all mountain components.
__________________
Proud supporter of the Chippewa Off-Road Bike Association (CORBA)
www.chippewaoffroad.org

Peek the Geek is offline   Reply With Quote
Old 03-06-05, 04:31 PM   #2
docbluedevil
Senior Member
 
Join Date: May 2004
Location: Hilly Colorado
Bikes:
Posts: 144
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rear mtb derailleurs used for mtb/wide gear cassettes (e.g. 11/34)
Rear road derailleurs used for tighter gearing (e.g. 12/25)
docbluedevil is offline   Reply With Quote
Old 03-06-05, 04:40 PM   #3
Peek the Geek
is slower than you
Thread Starter
 
Peek the Geek's Avatar
 
Join Date: Jan 2005
Location: WI
Bikes: Gunnar Sport, Marin Pine Mountain, Gunnar Ruffian, Gunnar Roadie, BMC Fourstroke, Salsa Vaya
Posts: 1,486
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by docbluedevil
Rear mtb derailleurs used for mtb/wide gear cassettes (e.g. 11/34)
Rear road derailleurs used for tighter gearing (e.g. 12/25)
So is either one much more common than the other? Does the decision come down mainly to the type of terrain a rider will be on most of the time?
__________________
Proud supporter of the Chippewa Off-Road Bike Association (CORBA)
www.chippewaoffroad.org

Peek the Geek is offline   Reply With Quote
Old 03-06-05, 05:07 PM   #4
dlbcx
Senior Member
 
Join Date: Dec 2004
Bikes:
Posts: 108
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Peek the Geek
So is either one much more common than the other? Does the decision come down mainly to the type of terrain a rider will be on most of the time?
Pretty much; the shifters will work with either type of derailleur. I run an Ultegra FD and an old XTR on the back. The only thing that might be problem if you try to use one of the newer XTR RD that is designed for the Rapid Rise shifters.
dlbcx is offline   Reply With Quote
Old 03-10-05, 03:14 PM   #5
Sloth
Senior Member
 
Join Date: Jul 2004
Bikes:
Posts: 293
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I run a RR XTR rear derailleur with a road shifter, no problems. Everything is reversed, but it works just fine.
Sloth is offline   Reply With Quote
Old 03-10-05, 03:58 PM   #6
darkmother
Get the stick.
 
darkmother's Avatar
 
Join Date: Nov 2004
Location: Toronto, ON
Bikes: 12 Y.O. Litespeed MTB, IRO Jamie Roy fixie, Custom Habanero Ti 'Cross, No name SS MTB, Old school lugged steel track bike (soon)
Posts: 1,543
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The road FD's are shaped to work with larger big rings than the MTB equivalent. You can still use a MTB FD, but presumably it won't work quite as well. Rear deraileur is similar. MTB rears are designed for a wider gearing spread, but will still work on with a road cogset.

I'm using MTB front (old school 110mm BCD stuff) and MTB rear deraileurs on my cross bike. I run a triple with 28/42/52 gearing, and a rear road cluster of 12-25. It seems to work very well, shifting is great.
darkmother is offline   Reply With Quote
Old 03-11-05, 06:22 PM   #7
2WheelMotion
Member
 
2WheelMotion's Avatar
 
Join Date: Feb 2005
Location: Colorado
Bikes: 2002 Surly Instigator, 1999 Litepseed Blue Ridge, 1997 Trek Y-33, 1992 Schwinn 540
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Can I use an Ultegra 9spd brake/shifter with an older (8spd) long cage XT rear derailleur? I guess I'll have to buy a newer 9spd mountain cluster
2WheelMotion is offline   Reply With Quote
Old 03-22-05, 02:25 PM   #8
touringv
Newbie
 
Join Date: Mar 2005
Bikes:
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Sloth
I run a RR XTR rear derailleur with a road shifter, no problems. Everything is reversed, but it works just fine.
It seems like it is more intuitive. The big lever always means "faster" on either shifter, the smaller one ="slower." Do you have any problem with rear downshifting on your set up? My Dura Ace lever/ XTR Rapid Rise Rear D combo seems to want to jump a gear going down (but not up).

Anyway, MTB rear derailleurs "hold" more chain so you can run wide range (11-32, 11-34 in some cases) cassettes. Road deraillers with the same cassettes would either bottom out (contact the small cogs) or do the equivalent of knee hyperextension on the large ones,depending on the length of the chain.
touringv is offline   Reply With Quote
Old 03-23-05, 09:44 AM   #9
ZenNMotion
Senior Member
 
Join Date: Dec 2003
Location: Inside the beltway
Bikes:
Posts: 236
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Sloth
I run a RR XTR rear derailleur with a road shifter, no problems. Everything is reversed, but it works just fine.
Wow- can you bunnyhop backwards too?
ZenNMotion is offline   Reply With Quote
Old 03-23-05, 09:49 AM   #10
ZenNMotion
Senior Member
 
Join Date: Dec 2003
Location: Inside the beltway
Bikes:
Posts: 236
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by 2WheelMotion
Can I use an Ultegra 9spd brake/shifter with an older (8spd) long cage XT rear derailleur? I guess I'll have to buy a newer 9spd mountain cluster
You can use a 9 speed sti shifter with an 8 speed cluster, works OK, you just have a ghost click. Don't get a new cluster until the old one is trashed. In fact it might even work marginally better in wet mud than 9 speed as it's not quite so finicky about adjustment, and 8 speed chains are stronger. The older XT derailleur will work fine.

If you don't want anything larger than a 27t in the rear, a road rear derailleur will shift a little faster, be less prone to snagging the chain on something, and better prevent chain drop when you're sloppy with bouncing your bike around on remounts. But if you're not racing it's not a big deal.

Last edited by ZenNMotion; 03-23-05 at 09:55 AM.
ZenNMotion is offline   Reply With Quote
Old 03-23-05, 12:54 PM   #11
Sloth
Senior Member
 
Join Date: Jul 2004
Bikes:
Posts: 293
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Do you have any problem with rear downshifting on your set up? My Dura Ace lever/ XTR Rapid Rise Rear D combo seems to want to jump a gear going down (but not up).
Nope, no problems. I'm using DA bar cons.
Sloth 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 01:24 AM.