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Old 12-16-07, 05:08 PM   #1
jetjock
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44/32/22 MTB crank on my road bike?

Am reposting this from the road cycling forum.

I am wondering if a mtb triple crank on my road bike will work.

I already have the ultegra long cage rear and triple front deraileur and use 9 speed barends.

Ive been playing around with the gear ratios and I really like the gearing a 11/21 9speed
cassette gives with this crankset. 108 on the top end and around 28 on the bottom plus
night tight spacing all the way thru the middle ring.

Any reason or considerations on why this will or will not work?
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Old 12-16-07, 05:12 PM   #2
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You might have issues getting the front derailleur to work properly, but heck it's not like you'll ruin anything trying.

You might have better luck pursuing a compact crank or perhaps one oriented towards touring (kinda midrange between mtb and road)
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Old 12-16-07, 05:40 PM   #3
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Or just get a cheap front MTB derailer as well. A plain Deore will do just fine, and doesn't cost at all much.
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Old 12-16-07, 05:42 PM   #4
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Or just get a cheap front MTB derailer as well. A plain Deore will do just fine, and doesn't cost at all much.
Aren't there issue with getting road shifters and MTB derailleurs to play nicely?
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Old 12-16-07, 05:50 PM   #5
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You may need a longer bb so the smallest chain ring doesn't hit the frame (or gives enough room for the chain).
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Old 12-16-07, 06:28 PM   #6
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Quote:
Originally Posted by jetjock View Post
Am reposting this from the road cycling forum.

I am wondering if a mtb triple crank on my road bike will work.

I already have the ultegra long cage rear and triple front deraileur and use 9 speed barends.

Ive been playing around with the gear ratios and I really like the gearing a 11/21 9speed
cassette gives with this crankset. 108 on the top end and around 28 on the bottom plus
night tight spacing all the way thru the middle ring.

Any reason or considerations on why this will or will not work?
Lots of touring folks use this set up. There really aren't too many problems. Your front derailer will handle the job just fine. If it doesn't look into a Tiagra front triple since it's more forgiving then the more expensive front road derailers. If you have to, might be able to use a mountain front since you are using barend shifters.
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Old 12-16-07, 06:54 PM   #7
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I installed a Race Face 44/32/22 on my touring bike (an old road bike) along with a 113mm ISIS BB and although the chain line isn't the greatest it works fine. Looks like a 108mm BB would improve the chainline in this case but ain't gonna mess with it since I'm changing touring bikes this winter.

I used a Deore Mountain bike Front D, all of 12 bucks I think and one size fits all. (comes with shims)

In the case of a touring bike the 44 big ring was plenty of top end for traveling but for my road bike I use and also recommend a compact crank with a 50 ring for the top speed.
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Old 12-16-07, 07:35 PM   #8
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Originally Posted by dobber View Post
Aren't there issue with getting road shifters and MTB derailleurs to play nicely?
not with friction shifting, and bar ends a friction in the front, users choice in the rear.
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Old 12-16-07, 07:37 PM   #9
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also, look at the sugino xd600 (unless you've got outboard bearings). Nice gearing and all siver to match the rest of your setup.
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Old 12-16-07, 08:25 PM   #10
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Forgot to mention I used downtube friction shifting for that crankset.
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Old 12-16-07, 08:31 PM   #11
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My impression was that you'd want to switch to a mountain front derailleur so the curvature of the cage plates matches the smaller chainrings.
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Old 12-16-07, 09:53 PM   #12
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I have a Trek 520, and when I bought it 7 years ago, I asked the shop to swap the drivetrain with an XT crankset with 44-34-22. I have kept the 105 (road) derailleur and it works flawlessly with bar-end shifters (i.e. friction in front).

The only problem would be if I were using STI levers, as they don't allow trimming.
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Old 12-16-07, 10:34 PM   #13
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I agree that the proposed setup should work. On one of my bikes I've got 9 speed bar ends, XT rear derailleur, 11 x 32 nine speed cassette, 105 front derailleur, and a 110/74 BCD crankset with 46/36/24 chainrings. It shifts beautifully front and rear. I did use a dremel tool to reshape the 105 front derailleur's outer plate a bit, to better match the 46t large chainring. That part is kind of fun, what with the sparks and all-
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Old 12-16-07, 11:56 PM   #14
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Aren't 9-speed bar-ends the bee's knees?
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Old 12-17-07, 05:49 AM   #15
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Quote:
Originally Posted by thechamp View Post
not with friction shifting, and bar ends a friction in the front, users choice in the rear.
That's assuming he has bar end shifters. Since he stated he had a road bike, one would natually assume he's got brifters, right?


According to Sheldon there is some issues with Brifters and MTB derailleurs - http://www.sheldonbrown.com/upgrade-gears.html

It's kind of ambiguous though.
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Old 12-17-07, 07:42 AM   #16
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Hey thanks for all the replys.

I do use barends. And love them. I bought a pair of cane creek speed bars and had them cut down
and shortened and they put the shifters just below my handle bars and my knees dont hit them when climbing out of the saddle.
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Old 12-17-07, 07:53 AM   #17
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Quote:
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That's assuming he has bar end shifters. Since he stated he had a road bike, one would natually assume he's got brifters, right?
It's not an assumption, the OP specifically said he has bar end shifters.
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Old 12-17-07, 08:01 AM   #18
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I had my oldie steel road bike set up with a Sugino mountain triple for a long while, and used it as my tow-the-kids and touring bike, and it worked great. Got a cheap mountain FD, long-cage RD, and twiddled at the bike shop to find the right bb axle length to get reasonable chainline. I had a 5-sp freewheel in the back, and probably could have climbed mount Everest with that thing. With friction shifters, you can do anything.
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Old 12-29-07, 12:14 AM   #19
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what kind of cable routing do you have for the rear deraileur? If it's above the chainstay you might have a clearance issue when you lower the front deraileur to match height with the new smaller chainring. This may or may not be addressed with a different FD.
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Old 12-30-07, 10:17 PM   #20
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I measured my bike. It would be close, but it would work. You might have to install the front derailleur 2-3 mm above its ideal position. No big deal with bar-end shifters; it would just mean a little bit more trimming.

P.S. my Trek 520 has 44-34-22 and the cable is under the chainstay. But there is about 4 mm between the derailleur at its lowest position and the chainstay.
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