Road vs mtb vs mix derailleurs
#1
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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.
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#3
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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)
Rear road derailleurs used for tighter gearing (e.g. 12/25)
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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?
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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.
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.
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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
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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.
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.
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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.
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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
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.
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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).