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Old 04-27-07, 08:48 AM   #1
acroy
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Can I run a road casstte on my mtb?

I use a converted mountain bike with slicks for commuting, and would like a tighter gear ratio. Plus, not like I need that 32-tooth low...

I have a 9-spd Sram PG 970 cassette, can I replace straight-up with maybe a 105 cassette? Is the spacing the same? Chain width the same?
Thanks!!
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Old 04-27-07, 09:07 AM   #2
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Quote:
Originally Posted by acroy
I use a converted mountain bike with slicks for commuting, and would like a tighter gear ratio. Plus, not like I need that 32-tooth low...

I have a 9-spd Sram PG 970 cassette, can I replace straight-up with maybe a 105 cassette? Is the spacing the same? Chain width the same?
Thanks!!

Yep, no problem. You'll need to shorten the chain accordingly, but as long as you're going nine speed to nine speed the chain width will be the same, the shifters will work, etc.-

P.S. You will probably need to adjust the B screw on the RD also, because of the smaller large cog on the 105 cassette-
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Old 04-27-07, 09:11 AM   #3
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I can recoment the SRAM 12/26 for the bike. In addition you can change to a 26/36/48 chainring from the deore group up front.
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Old 04-27-07, 09:15 AM   #4
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sweetness, thanks for the responses.
front ring is ok, i spin out mid 30's mph with current gearing, which is plenty... no hills here to speak of.
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Old 04-27-07, 09:43 AM   #5
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sounds as if you're good to go. I ran a 11-21 cassette for years with an XT rear derailer, just because I'd built up the bike before road-triple rear derailers were commonly available. Worked great.
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Old 04-27-07, 10:29 AM   #6
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+1. I converted a mid-90's Trek MTB for road use and am running a 12x25 Shimano cassette (8-speed, but that's immeterial) with the original Deore LX rear derailleur and it works just fine.

It's a real convenience that SRAM cassettes share (stole? ) the same spacing as Shimano.
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Old 04-27-07, 01:28 PM   #7
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Can you really patent a spacing?
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Old 04-27-07, 01:42 PM   #8
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Can you really patent a spacing?
Well, it's actually more than the spacing of the cogs, because the SRAM cassettes are compatible with Shimano freehubs. Licensing fees involved? I have no idea, but they're definitely considered (and advertised as) "Shimano compatible."
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Old 04-27-07, 02:29 PM   #9
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Quote:
Originally Posted by acroy
I use a converted mountain bike with slicks for commuting, and would like a tighter gear ratio. Plus, not like I need that 32-tooth low...

I have a 9-spd Sram PG 970 cassette, can I replace straight-up with maybe a 105 cassette? Is the spacing the same? Chain width the same?
Thanks!!
Been doing that for years on my commuter. 11-23 works just fine for me. Take the others advice and shorten the chain. The best way to get a good chain length is to thread the chain onto the large/large combination, without running it through the rear dérailleur. Pull it snug and add an inch before you cut.
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Old 04-27-07, 02:36 PM   #10
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I'm running a 11-25 on my new Trek 6000. I love it, and wonder why i didn't do this sooner. "Road" cassettes are best for the road, regardless of what kind of bike they are on.
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Old 04-27-07, 04:37 PM   #11
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Quote:
Originally Posted by acroy
I use a converted mountain bike with slicks for commuting, and would like a tighter gear ratio. Plus, not like I need that 32-tooth low...

I have a 9-spd Sram PG 970 cassette, can I replace straight-up with maybe a 105 cassette? Is the spacing the same? Chain width the same?
The terms "road" and "mountain" as applied to chains, cassettes, derailers and many other parts are nothing but marketing hype.

They're perfectly compatible, with the proviso that wide range cassettes (bigger than 30 teeth) require a wide range (long cage) rear derailer.

See: http://sheldonbrown.com/speeds

Sheldon "Don't Believe The Hypesters" Brown
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