Home Forums 250 Superkarts CR250 gearing

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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

       

    • #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 :-)

    • #15126
      Ian Harrison
      Participant

      Here’s a screenshot:

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