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 10-15-10, 05:13 PM   #1
Oysterboy
All work and no play...
Thread Starter
 
Oysterboy's Avatar
 
Join Date: Sep 2010
Bikes:
Posts: 144
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
So what's the downside of using MTB components on a road bike

I have an XTR rapid rise derailleur on my '98 Fisher Joshua Z0 (yes, thank you, it's a friggin' awesome bike). While out riding today I re-realized that the XTR derailleur on that bike is truly awesome. Are there any good reasons for not considering an MTB derailleur for my TT build?
Oysterboy is offline   Reply With Quote
Old 10-15-10, 05:19 PM   #2
AEO
Senior Member
 
AEO's Avatar
 
Join Date: Jun 2007
Location: A Coffin Called Earth. or Toronto, ON
Bikes: Bianchi, Miyata, Dahon, Rossin
Posts: 12,258
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
it's a bit heavier
rapid rise reverses the direction of the shifting, so your levers will do up on a down and down on an up.
it's a bit slower, not that most people would notice it, due to the angle and distance from the top pulley to the cassette. closer and more parallel to the ground gives smoother, faster and crisper shifts.

other than that, there's no real downside.

oh, I think I've heard that the latest generation of XTR rear derailers do not match up to road cable pull ratio. The front derailer never matched up between road and mtb, but barcons in friction mode could fix that.
__________________
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
http://sanfrancisco.ibtimes.com/arti...ger-photos.htm
AEO is offline   Reply With Quote
Old 10-15-10, 07:07 PM   #3
mcgreivey
STFD
 
mcgreivey's Avatar
 
Join Date: Jul 2008
Location: North Bergen, NJ
Bikes: '80 Windsor Carrera Sport, '02 Specialized Sirrus A1, '10 Giant Escape 2
Posts: 778
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Aside from the technical things AEO metioned, the only issue might be whether you care if road snobs will laugh at you. Personally, I don't care whether people don't approve of my bike, but some people worry about such things.
mcgreivey is offline   Reply With Quote
Old 10-15-10, 07:09 PM   #4
wunderkind
Pro Paper Plane Pilot
 
wunderkind's Avatar
 
Join Date: May 2009
Bikes:
Posts: 1,645
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I think MTB parts are often seen with touring road bikes like the Deore models. I am thinking they are prolly more "hardy" than the road bike cousins.
wunderkind is offline   Reply With Quote
Old 10-15-10, 07:33 PM   #5
Wordbiker
Pwnerer
 
Wordbiker's Avatar
 
Join Date: Jun 2005
Location: Pagosa Springs, CO, USA
Bikes: Road, MTB, Cruiser, Chopper, BMX
Posts: 2,907
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A) Rapid-Rise sucks.
B) Real roadies will laugh at you.
C) If you need that much gearing capacity, they have good reason to laugh at you.
__________________
Quote:
Originally Posted by ahsposo View Post
Ski, bike and wish I was gay.
Wordbiker is offline   Reply With Quote
Old 10-15-10, 09:53 PM   #6
reverborama
Broom Wagon Fodder
 
reverborama's Avatar
 
Join Date: Jul 2006
Location: Minnesota
Bikes: Fuji Supreme; Kona Wo; Nashbar road frame custom build; Schwinn Varsity; Nishiki International; Schwinn Premis, Falcon Merckx
Posts: 1,232
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Some mountain derailleurs don't have the barrel adjuster on them -- I have an LX that does and an XTR that doesn't. If it doesn't you will have to find a place to insert an in-line adjuster.
reverborama is offline   Reply With Quote
Old 10-15-10, 10:35 PM   #7
tk1971
Senior Member
 
tk1971's Avatar
 
Join Date: Sep 2010
Location: San Gabriel, CA
Bikes: Nishiki Prestige, Reign, IH Warrior, Rockhopper, Brompton, Q-Bike, Forever, Free-Ride, Dahon, Merckx Premium, Litespeed Teramo, Raleigh MTi 1000, Motobecane Fly Ti, OnOne 456, Kona Unit, Transition TransAM
Posts: 272
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by Wordbiker View Post
A) Rapid-Rise sucks.
B) Real roadies will laugh at you.
C) If you need that much gearing capacity, they have good reason to laugh at you.
A) For road maybe (haven't tried it yet), but MTB, it works great

B) What's a "REAL" roadie and why do you care if someone laughs at you? I've never actually ever witness anyone laughing at others in public. I've also read that "Real roadies" will laugh under any of these other circumstances as well: Wearing a Camelpak; wear MTB shorts; ride without road specific shoes with their mating clipless pedals; and don't meet up at the local StarBucks before every ride.

C) Why would anyone bother to laugh at someone that might need more gearing? At least you're out there riding. Isn't that what matters?

If it works on your bike, use it.

tk

Last edited by tk1971; 10-16-10 at 08:49 AM.
tk1971 is offline   Reply With Quote
Old 10-15-10, 10:46 PM   #8
Jeff Wills
Insane Bicycle Mechanic
 
Jeff Wills's Avatar
 
Join Date: Mar 2008
Location: other Vancouver
Bikes:
Posts: 7,980
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
Quote:
Originally Posted by tk1971 View Post
If it works on your bike, use it.

tk
I have an XTR derailleur on my "road bike": http://home.comcast.net/~jeff_wills/...-grr%20006.htm . My low gear is 24/34... 18 gear inches. I used this gear on a long, 10 to 15% climb last summer. I get along fine with "real roadies".
__________________
Jeff Wills

Comcast nuked my web page. It will return soon..
Jeff Wills is offline   Reply With Quote
Old 10-16-10, 09:31 AM   #9
pwdeegan
smitten by саша
 
pwdeegan's Avatar
 
Join Date: Sep 2008
Location: Eugene, OR
Bikes: Salsa La Cruz with Rohloff; mutt parts
Posts: 525
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i used to run an XT rear derailleur on my 1x9 road bike (with Ultegra brifters). it would confuse many roadies as i passed them, up hills and down; but mostly up hills. for my riding style, i found that the rapid-rise was less necessary on road riding than MTB, because i could pretty clearly anticipate hills and i never up-shifted more than one gear at a time.

here's to never mashing and happy knees.
pwdeegan is offline   Reply With Quote
Old 10-16-10, 11:10 AM   #10
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)
I don't understand why you would want a mountain type derailleur on a TT bike unless you plan to use it with a mountain cassette for a mountain time trial.

Mountain type cassettes don't work so well on long flat rides because the ratio jumps are too wide and cause big changes in cadence.
Having said that, if you need it you need it.
Al1943 is offline   Reply With Quote
Old 10-16-10, 11:25 AM   #11
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 20,436
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 656 Post(s)
It begins to function like a Touring bike, and the guys that can climb in a 39/23 gear will hammer off ahead.
fietsbob is offline   Reply With Quote
Old 10-16-10, 11:26 AM   #12
BCRider
Senior Member
 
BCRider's Avatar
 
Join Date: Mar 2008
Location: The 'Wack, BC, Canada
Bikes: Norco (2), Miyata, Canondale, Soma, Redline
Posts: 5,456
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It's about tuning the range of gearing to your needs and to hell with "style". Because I used to live in a location where there's normally heaps of hills I used MTB cassetes and derraileurs on all my bikes so I would have the range of gearing options to deal with all the climbs that came up. However I've recently moved out to where the valley around me is very flat with hills around the edges. I'm finally in a place where I can "safely" set up a bike with a proper road cassete and derraileur. But I think I'll likely keep a triple up front just in case I want to explore the hills around the edges now and then.
BCRider is offline   Reply With Quote
Old 10-16-10, 12:53 PM   #13
badamsjr
17yrold in 64yrold body
 
Join Date: May 2010
Location: Northern CA
Bikes:
Posts: 922
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by fietsbob View Post
It begins to function like a Touring bike, and the guys that can climb in a 39/23 gear will hammer off ahead.
Probably true about guys that can climb, but if the OP needs these gears (like me and others), he would NOT be keeping up with them in any event. I do not really care if 'real road riders' think my gearing is funny. I use what works for me, and they can go 'hammer off ahead' all they want. I have 24/34/52 with 11-34 9spd. The only hill I have had to walk is the VERY steep section at the top of Mt Diablo, but I am not alone there.
badamsjr 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 01:13 AM.