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Thread: Sprocket sizes

  1. #1
    Join Date
    14th September 2007 - 16:34
    Bike
    '18 DRZ400SM
    Location
    Wellington
    Posts
    2,116

    Sprocket sizes

    It's time to get my Chain and Sprockets done. I've just hit 30,000Km, and run out of adjustment. I want to change the Sprocket sizes. From what (little) I understand, dropping 1 tooth on the front, or adding 2-3 on the rear Sprocket provides better acceleration, and the cost of top-end speed. Is that right?

    Question is, is it generally advisable to alter the front, or rear sprocket, or does it make fuck-all difference?

    Fortunately, I can re-program the ECU to correct the Speedo error at Home, so I don't need to worry about a false readout, or a speedo healer.

    Thanks guys.
    "It would be spiteful, to put jellyfish in a trifle."
    \m/ o.o \m/

  2. #2
    Join Date
    13th April 2007 - 17:09
    Bike
    18 Triumph Tiger 1050 Sport
    Location
    UK
    Posts
    3,802
    Sounds like a good idea. A 250ish kph potential top speed is a waste of time here in NZ.

    They do kits with the right ratio for your bike. I heard of them on the Rat site. You might want to check the results others have had before taking the plunge.

    TuneECU is an amazing piece of freeware

  3. #3
    Join Date
    25th April 2009 - 17:38
    Bike
    RC36, RC31, KR-E, CR125
    Location
    Manawatu
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    7,364
    www.gearingcommander.com is your friend here!

    worst thing about changing gearing is higher cruise rpm I reckon, if you got a bit of room for movement there then go for it
    "A shark on whiskey is mighty risky, but a shark on beer is a beer engineer" - Tad Ghostal

  4. #4
    Join Date
    14th September 2007 - 16:34
    Bike
    '18 DRZ400SM
    Location
    Wellington
    Posts
    2,116
    Wicked site. Thanks bogan!
    "It would be spiteful, to put jellyfish in a trifle."
    \m/ o.o \m/

  5. #5
    Join Date
    3rd February 2004 - 08:11
    Bike
    2021 Street Triple RS, 2008 KLR650
    Location
    Wallaceville, Upper hutt
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    5,238
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    1 tooth difference on the front has about the same effect as 3 difference at the back, but obviously 1 tooth at the front is easier to accomodate within the standard chain and cheaper as well. Going too small (ie like 13 - 14) on the front causes more chain wear.
    it's not a bad thing till you throw a KLR into the mix.
    those cheap ass bitches can do anything with ductape.
    (PostalDave on ADVrider)

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