Rear Sprocket

Discussion in 'Maintenance' started by Milky, Aug 25, 2011.

  1. Milky

    Milky Active Member

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    Bit of advice. Heard that you can fit 42 T rear sprocket instead of 40 T to 2005 Blade to give a bit more low down grunt. Speedo will not be accurate, but by how much mph wise ??:help:
     
  2. dan.1moore1

    dan.1moore1 Senior Member

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    10 MPH ish
     
  3. Remal

    Remal It's ME
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    sorry off topic but made me think of this

    Sean Connery's agent calls him up and says: "Sean, I've got you an audition tomorrow morning about 10ish"

    To which Sean replies "Tennish? I don't even have a racquet"
     
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  4. flatstickHRC

    flatstickHRC Active Member

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    There is a calculator on the healtech speedo healer website.

    I don't think +2 teeth will affect it that much.

    The figure will increase/decrease depending on your speed but I would expect around 3-5% difference.


    The speedos are a mile out to begin with anyway so wouldn't worry too much.
     
    #4 flatstickHRC, Aug 25, 2011
    Last edited: Aug 25, 2011
  5. Brym

    Brym Active Member

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    Rough guide would be about 10% over reading. I did that on my old GSXR and factored it in if i rode past a speed camera etc to be sure never had a problem. And as said they are a bit out as standard anyway
     
  6. djfleming22

    djfleming22 Active Member

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  7. flatstickHRC

    flatstickHRC Active Member

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    Right here we go


    The speedo over reads by 5% as standard

    With a 55 rear tyre it over reads by just 2.3%



    Go up 2 teeth on the back to a 44 on a 50 tyre and speedo over reads by 9.5%

    Go up 2 teeth with a 55 rear tyre (which I have) and speedo over reads by 6%


    So up 2 teeth on the back with a 55 tyre gets your speedo more or less back to where it was when it left the factory
     
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  8. flatstickHRC

    flatstickHRC Active Member

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    Masher if you fit -1f +2r on a 50 tyre you will over read by 15% or 12% with a 55 tyre
     
  9. Milky

    Milky Active Member

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    Thanks for advice folks defo something I'll consider when I get it back
     
  10. dan.1moore1

    dan.1moore1 Senior Member

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    So my 55 tyre with standard sprockets will be out ? Good enough excuse for me to go up 2 teeth i reckon lol
     
  11. flatstickHRC

    flatstickHRC Active Member

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    Well yes and no


    The standard speedo has a 5% over read built in

    So with a 55 tyre it reduces it to just a 1% over read so your actually more accurate with the 55 tyre.

    Fitting a 44t will take it back to 6% so roughly back to standard speedo reading.
     
  12. Jamiestrada

    Jamiestrada JamieMultiTraitor

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    I have a 55 rear so Going +2 on the rear sproket then, and I dont have to spend £80 on a speedo healer like I did on the R1

    Result !

    !!!UPDATE!!!

    Just got a 44th 530 sprocket from Talon in yeovil Anodised gold for £30, so will be fitting that tonight, then hope it stops raining !
     
    #12 Jamiestrada, Aug 26, 2011
    Last edited: Aug 26, 2011

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