| Is it possible to put the Gears from a Road Bike on a Mountain Bike to increase the speed? Is it a simple job?

Is it possible to put the Gears from a Road Bike on a Mountain Bike to increase the speed? Is it a simple job?

Pomi D asked:


I’m not a bicycle pro, but i see it as simply changing the Main gears into the bigger ones from the road bike, is it possible - w/o changing the shifting mechanism???

Do i only have to change the rear cassette to the lower range, or i also have to change the front ones to the bigger ones as well???

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Comments

5 Responses to “Is it possible to put the Gears from a Road Bike on a Mountain Bike to increase the speed? Is it a simple job?”

  1. Bob A on April 30th, 2009 7:52 pm

    Yes, just change the cassette to a lower range of gears, but you may have to make adjustments to the “B” screw.

  2. Ride!Urban on May 3rd, 2009 2:31 pm

    You can swap the cassettes with no problem as long as you aren’t trying to put a Campagnolo one on there. You may have to buy a new shorter-cage rear derailleur, though…..just depends.

    Putting larger road chainrings on the mtb frame might be possible but you’ll need to try it out. There may be clearance issues with the chainstays. If so, one option would be to use a longer bottom bracket, but then you may run into ugly issues with chainline and shifting. You can certainly go up to a 46t or 48t ring on the mountain bike (and using larger corresponding rings on the small/middle so that you don’t make the front derailleur confused or angry). Larger than that, however, and you’ll just have to see.

    In either case, you’ll need to know how to re-set/reposition and adjust both derailleurs from scratch.

    Another option is to just pedal faster. lol. :o)

  3. hands.adrian on May 3rd, 2009 2:40 pm

    change either or both. not too hard IF you have the special tools.

  4. MtBikr on May 5th, 2009 11:13 am

    You do not need a road cassette, check the one you have on your bike now, it likely to have either an 11 or 12 tooth small gear. If you have a 12 get a new 11-xx to replace the 12-xx one you have, there is no good reason to get a road cassette except to lose a few grams and then you will give up the low 32 or 34 tooth gearing for those hard climbs. Now to gain speed you need to change the big ring gear. If you hunt around a bit you can find 46, 48, 50 and 52 tooth for 4 bolt cranks. You can put on a 46 with no shifting problems, but if you go to a 48 or larger you need to check the clearance of the derailleur and the ring gear and will need to readjust the clearance to allow proper shifting.

  5. Sam K on May 5th, 2009 4:37 pm

    Use any of the above mentioned options but be sure to check your chain length as it WILL be effected by changing either cogs or front chainrings. Depending on what you do you may need to add or remove 2 or 3 links to keep everything working right (derailler from pulling too much and catching in the cog set)