Home Forums 250 Superkarts CR250 gearing

This topic contains 5 replies, has 3 voices, and was last updated by  Ian Harrison 5 months, 1 week ago.

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  • #14398

    Gerry MCN
    Participant

    I know this is a long shot but does anyone have a link or formula for gearing on a CR250, showing various front sizes to rear sizes, what approximate top speed would be at max or various RPM’s

     

    #14411

    Ian Harrison
    Participant

    Hi Gerry

    Drop me a mail on sales@viper-racinguk.co.uk and I’ll e-mail what you need.

    Best Regards

     

    Ian

    #15076

    James McMahon
    Participant

    Give this a go….
    Credit goes to John Denman and his original “gearmaster.xls” that he made for the CR125….

    https://www.dropbox.com/s/t5zh3uc9g46bnz6/CR250%20GearMaster.xls

    Actually Ian if you’d error check this sheet I’d be much obliged!

    #15111

    Ian Harrison
    Participant

    Hi James

    That’s OK as far as it goes, but it’s pretty basic and doesn’t display enough information at one time, so makes it more difficult to make a quick judgement. But it works and it provides the necessary info.

    Mine gives a more comprehensive display i.e. speed in each gear in kph and mph in 500 rpm increments and includes a list of the Viper alternative gear ratios to input if required.

    I’ll try and put up a screen shot of mine, tomorrow (but the display area on this forum is crap!!) and work out a dropbox so that anyone can download it.

    Best Regards

    Ian

     

    #15126

    Ian Harrison
    Participant

    Here’s a screenshot:

    #15157

    Ian Harrison
    Participant

    Hopefully this works guys.

    Click on the link and save a copy, with the compliments of Viper Racing UK.

    https://www.dropbox.com/s/jmryaap4w37fm2n/CR250%20Speed%20Calculator.xls

     

    Best Regards

     

    Ian :-)

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