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  1. #1
    Senior Member acroy's Avatar
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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!!
    beer-bottle target

  2. #2
    biked well well biked's Avatar
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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-

  3. #3
    Small Member maddmaxx's Avatar
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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.

  4. #4
    Senior Member acroy's Avatar
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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.
    beer-bottle target

  5. #5
    me have long head tube TallRider's Avatar
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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.

  6. #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.

  7. #7
    Videre non videri
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    Can you really patent a spacing?

  8. #8
    biked well well biked's Avatar
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    Quote Originally Posted by CdCf
    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."

  9. #9
    I drink your MILKSHAKE Raiyn's Avatar
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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.

  10. #10
    Banned.
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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.

  11. #11
    Gone, but not forgotten Sheldon Brown's Avatar
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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
    [COLOR=blue][CENTER][b]Harris Cyclery, West Newton, Massachusetts[/b]
    Phone 617-244-9772, FAX 617-244-1041
    [URL= http://harriscyclery.com] http://harriscyclery.com[/URL]
    Hard-to-find parts shipped Worldwide
    [URL=http://captainbike.com]http://captainbike.com[/URL]
    Useful articles about bicycles and cycling
    [URL=http://sheldonbrown.com]http://sheldonbrown.com[/URL] [/CENTER] [/COLOR]

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