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MTB crankset on road bike.

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MTB crankset on road bike.

Old 08-10-12, 01:35 PM
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biknbrian
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MTB crankset on road bike.

What does it take to put a MTB triple crankset on an integrated shifter (Sora) equipped road bike?
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Old 08-10-12, 01:41 PM
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Possibly a new frame, the rings on an MTB crank may hit the chainstays, may not, you need to investigate. If it fits, then a new possibly a Front Mech, it won't pull the same amount of cable as the road shifter did, depending on what type of BB (HT2 type) you are using, you may be able to use spacers to avoid this. There could be other issues, but this is for starters.

What is the objective with this, if you are looking at lower gearing, why not just get a larger range cassette &/or a compact crank.
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Old 08-10-12, 01:49 PM
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In terms of what tools? Can you be more specific?
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Old 08-10-12, 01:55 PM
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We ride steep back roads quite frequently. My wife claims that she never uses the 52 tooth ring on her road triple, but she often finds herself in 1-1 spinning her way up hills. She already has an 11-32 rear cassette. Her bike is a Cross Check we put together. I swear I've seen touring bikes running MTB crank sets. I expect to have to buy a new derailleur just to match the chainring arc. So basically will a brifter pull a MTB front dérailleur correctly for the spacing on a MTB crankset?
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Old 08-10-12, 01:58 PM
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Originally Posted by caloso View Post
In terms of what tools? Can you be more specific?
I have tools and have built bikes, I just don't know about mixing road and mountain components?
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Old 08-10-12, 02:03 PM
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Is she running a road triple ATM? If so a MTB crank that uses the same BB spindle length (assuming square taper)

If not, I'd dig up a compact crank 50/34, even that may require different bottom bracket, depending on current road crank.

She should use her big ring more on flats and downhills. 42x11 or 39x11 wears more quickly than a 52x15 (or whatever the equivalent gear to 42x11 is)

Need to know make/model/year/BB interface of current cranks.
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Old 08-10-12, 02:10 PM
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I guess I should clarify that to me it isn't a question about the bottom bracket area or the crank itself. My question is about cable pull and derailleur movement.
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Old 08-10-12, 02:13 PM
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Originally Posted by biknbrian View Post
What does it take to put a MTB triple crankset on an integrated shifter (Sora) equipped road bike?
The tools to do the job. And the crankset, of course

I have mountain bike cranksets on several road bikes and never had an issue with installing them. You may have to deal with spacers to get the chainline right but even that isn't a given nor that hard.

You probably won't need a new front derailer and should avoid putting a mountain bike front derailer on an STI equipped bike. They don't play nice together. Instead use the current road front that the bike has. It will work even with a 44 tooth outer.
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Old 08-10-12, 02:17 PM
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Is she running a road triple at the moment?

There may be a much cheaper/easier/better solution than putting on an MTB triple.
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Old 08-10-12, 02:17 PM
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Originally Posted by cyccommute View Post
The tools to do the job. And the crankset, of course

I have mountain bike cranksets on several road bikes and never had an issue with installing them. You may have to deal with spacers to get the chainline right but even that isn't a given nor that hard.

You probably won't need a new front derailer and should avoid putting a mountain bike front derailer on an STI equipped bike. They don't play nice together. Instead use the current road front that the bike has. It will work even with a 44 tooth outer.
Thank you, that is exactly what I was looking for.
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Old 08-10-12, 02:19 PM
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Using MTB cranks on road bikes, especially one like the Cross Check, is easy. You will need a 68 mm bottom bracket for the crank, not an MTB 73 mm one. Your road front derailleur will probably work with the new crank despite the "wrong" curvature but you will have to lower it to the proper clearance with the smaller chainrings. Typically, brifters do not work well with MTB front derailleurs since their cable pull is different.
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Old 08-10-12, 02:26 PM
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Originally Posted by HillRider View Post
Using MTB cranks on road bikes, especially one like the Cross Check, is easy. You will need a 68 mm bottom bracket for the crank, not an MTB 73 mm one. Your road front derailleur will probably work with the new crank despite the "wrong" curvature but you will have to lower it to the proper clearance with the smaller chainrings. Typically, brifters do not work well with MTB front derailleurs since their cable pull is different.
Thanks for another reassuring answer. I am leaning towards an outboard bearing style and I know they usually come with several spacers so adapting to the correct width and adjusting chain line and such should be no big deal.
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Old 08-10-12, 02:43 PM
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I installed a Mt bike Shimano Deore triple crankset, and both derailleurs without and issue what so ever, I also used the Deore BB and spindle from from the same Mt bike.
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Old 08-10-12, 05:25 PM
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The first step is to take off the road bike crank and install the mtb crank. If both are square taper, I would not change anything except cranks. As you tighten the mtb crank observe to see if the small ring is going to hit the frame. If it does not hit the frame then proceed to step 2 and adjust the front derailer. Then take it for a test ride. If you are lucky you are finished unless you want to change the chain length and replace the rear derailer with one that has enough capacity to take up the slack in the chain.
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