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Old 05-27-05, 05:25 AM   #1
RockinAR
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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.
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Old 05-27-05, 05:29 AM   #2
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Are you spinning out in your highest gear?
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Old 05-27-05, 05:46 AM   #3
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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.
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Old 05-27-05, 06:19 AM   #4
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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.
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Old 05-27-05, 02:53 PM   #5
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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.
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Old 05-27-05, 03:56 PM   #6
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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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