What it does
Commander is a tool to calculate online the effect of
changing various parts of a
motorcycle's drive train."
motorcycle owners want their bike to behave differently from stock or current
setup at certain speeds or RPM. In that case there are several ways to
achieve that and one of them is changing the gearing. The Gearing Commander can
be used to predict the effect the change will have and thus save you spending
money on the wrong parts !
changes people make are different
Rear Sprocket, different
Front Sprocket, different rear Tire size and different
Chain. Besides these you could also change the gearbox ratio's and
the Primary Drive Ratio although that takes
some "major surgery". The Gearing Commander's database stores all
gearing specifications for over 1500 bikes and uses them to calculate
speeds, RPM's, chain length etc. By selecting your bike and changing 1 or
more variables you can predict the theoretical outcome without having to spent
money on costly experiments !
Gearing Commander saves money :-)
results are calculated online using factory gear
data that you can change to your current or future gear data, you can configure your bike as it
currently is and configure it the way you are considering it to be and see the calculated consequences !
Using the Gearing
Commander you can:
theoretical top speed of your bike in all gears for chain drive, belt drive
and shaft drive bikes.
of sprocket changes on speed at specific RPM
of sprocket changes on RPM at specific speed's
speeds in stock, current and custom setup related to gear and RPM
speeds in custom setup for 49 sprocket combinations for use on the racetrack
of other rear tire dimensions (for instance wider) on (top) speed and
circumference for setting of cycle computer
of changes on sprocket center distance (rear wheel travel
needed to tighten the chain or belt)
the number of links (new chain length) your chain should be to have a big enough adjustment
the number of teeth (new belt length) your belt should be to have a big enough adjustment
on whether to have a smaller front sprocket or to have a bigger
optimum tooth-links combination to minimize chain and sprocket wear
result tables into
for a more visual effect of the changes
graph see results of changing sprockets on Shift-Speeds in all
gears & setups (Speed range/gear)
Final Drive Ratio Chart
Gearing Ratio Table to see effect of sprocket changes on overall
||Create Total Gearing Ratio table which
shows the effects of a different rear tire
size on the Overall gearing ratio.
Chain- (Cd) and Belt-diameters (Bd) in graph to see if sprockets
with chain/belt will
fit your bike.
calculations are based on the specific gearing data of a bike either
entered by you or loaded from the database.
provided is based on theoretical calculations in optimal conditions and therefore
it will differ from reality. For instance all chain length calculation are without
taking into account current chain wear and tension.
Also all calculations
depend on the M.P.RPM entered but there is no guarantee that your bike will
actually reach M.P.RPM. This depends on the power your bike delivers,
the wind resistance and the way it is geared.
As all results are calculated, we do not take any speedometer or rev-counter deviations into
So results shown should match your GPS not your speedometer
(when actually running all entered parameters).
So please use all
results as guidelines rather than facts !
Commander is optimized for Edge, Internet Explorer 8 & Up and Mozilla FireFox 4
on Motorcycle Gearing Basics
Back to Gearing Commander