redkow97 Posted July 31, 2013 Report Share Posted July 31, 2013 Anyone have a good gearing/speed calculator online?I would prefer one with mechanical ratios AND real-world estimates that factor in powertrain loss, true horsepower, and possibly even rider weight. (This stems from messing with gearing at PIRC last night on the XR. I am curious how much more I could gear it down before I hit the point of diminishing returns. We logged a GPS verified 48.3 mph with the bike pegged at the rev limiter. I am wondering if 6hp would be capable of 55 or even 60mph with tall enough gearing and enough flat ground. Purely an academic exercise with virtually no real-world application) Quote Link to comment Share on other sites More sharing options...
mojocho Posted July 31, 2013 Report Share Posted July 31, 2013 Check outwww.gearingcommander.comI've used this in the past. Quote Link to comment Share on other sites More sharing options...
Bad324 Posted July 31, 2013 Report Share Posted July 31, 2013 I want to say that 12oclocklabs had one on his site when I bought a speedohealer from him years ago for my first 600RR Quote Link to comment Share on other sites More sharing options...
redkow97 Posted August 1, 2013 Author Report Share Posted August 1, 2013 Looking at the gearing commander site, it's calling me a liar... I'm wondering if I need to adjust the wheel size to bring things into a more accurate calculation. That is the major discrepancy between my bike and JB's bike (I'm running moped tires, and he's running much taller BT-45's) Quote Link to comment Share on other sites More sharing options...
Helmutt Posted August 1, 2013 Report Share Posted August 1, 2013 Here's a couple tire calculators to see the effects of circumference changes.....hope this helps http://www.rbracing-rsr.com/tirediamcalc.html http://easycalculation.com/physics/classical-physics/motorcycle-speedometer-calibration.php Quote Link to comment Share on other sites More sharing options...
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