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  1. #1
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    Regearing a MTB with road bike chainring & cassette?

    I real like my cheap MTB (GT Aggressor). I only ride on roads, sidewalks, etc. What I don't like are the slow MTB speeds. I was thinking of getting a road bike because I like the speed, but I'm not sure they fit my application. A lot of the road I ride on are beat up pretty bad and I need to hop some curbs, etc on occasion. I don't want a hybred bike.

    Would it be possible to have a road bike chain ring and cassette put on my MTB to incress the speeds? Even in my highest gear the road bikes effortlessly cruise right past me.

  2. #2
    Senior Member Brian's Avatar
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    Are you spinning out in your highest gear?

  3. #3
    slower than you Applehead57's Avatar
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    First thing is get tires with street tread. That's a huge change.
    I would change the cassette first, it's pretty cheap, and I don't think you need to change anything else to make it work. Perhaps a little adjustment of your derailleur adjustment screws, but I think it'll work immediately.
    After trying the new cassette, see if you need to replace the chain rings. That's not cheap,but it is do-able.
    "Lack of opportunity does not constitute virtue". Diana Tickle.

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    Senior Member Brian's Avatar
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    I'll agree with the tire swap, that's simple enough. But changing the cassette only gets you an 11 if your smallest cost was a 12. Cheap, but maybe not enough of a difference. If you've got a 44T up front, you can go up to a 46 or 48. Of course, if your cadence isn't that high, then it doesn't matter. If you don't spin, you'll never go fast.

  5. #5
    feros ferio John E's Avatar
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    I happily run a 48/13 (96 gear-inch) top gear on my mountain bike, which would be about the same ratio as a 41/11 or a 44/12.
    "Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
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  6. #6
    I couldn't car less. jeff williams's Avatar
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    What size mtn cassette do you run?
    My smallest cog was 12T so I replaced it with an 11T one. Like adding 3 teeth to your chainring.
    If you have a triple, adding teeth to the mid ring is no problem, not a cage issue.
    My chainstay dictates 38T ring mid max.
    So I run 38 -11. Offroad bike.
    If your cluster has a 12T..nowhere to go after 11 except after those chainrings.

    14-28 HG cassette? Well there you go. No 12 cog.
    You want a 12-28.
    The small cog reach doesn't matter -like if you wanted to say run a 32T hill cog =you need a long cage derailer.
    Get a 12-28. Try it first and if needed -get a 11T and lockring (you need the specific lockring).

    Going to a 11 from 14 will slow you down..er....speed you up. Be quite a difference.
    11 from a 12 is just under 2 mph increase in speed, running a 38T ring, 80rpm.
    One tooth =1.8 mph.

    Like 35$ ? For the cluster.
    I looked, your bike runs 38,48 I believe already.
    Last edited by jeff williams; 05-27-05 at 04:10 PM.

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