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Thread: K12RS v K12LT gearing

  1. #1
    1960R100S 46211's Avatar
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    K12RS v K12LT gearing

    I have a ?..... I have a 02 K12RS with a 33/12 rear drive. A guy in my motorcycle club gave to me a brand new rear drive unit from his 09 K12lt witch is a 34/13 ( he tricked it ). Would the LT be a lower gear or a higher gear then the RS gear.

  2. #2
    Curmudgeon At Large Bobmws's Avatar
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    33/12 = 2.75
    34/13 = 2.62

    The LT gearset will cruise at 60mph at a few lower RPM than the RS gearset. Your acceleration will be slightly slower.
    Bob Weis
    '04 K12RS - Hannigan Hack
    www.earplugco.com

  3. #3
    Benchwrenching PGlaves's Avatar
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    Quote Originally Posted by Bobmws View Post
    33/12 = 2.75
    34/13 = 2.62

    The LT gearset will cruise at 60mph at a few lower RPM than the RS gearset. Your acceleration will be slightly slower.
    That is a 4.72% change in ratio. So whatever the stock gearing has the engine turning at any given speed will be reduced by 4.72% at any road speed, in the same gear.

    So, for example, if with the original gearing the engine was turning at 4,000 it would be turning be turning at 3,811 with the new gearing
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://www.bigbend.net/users/glaves

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