Sprocket, chain, and gear ratios.

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OK boys and girls!  I know that trying to explain things on the internet is a fools errand.....but here goes.

The argument is that changing sprockets will only affect the high end or the low end not the gearing in between...so like 1st gear and 6th gear, not 2, 3, 4, and 5.

Look at the chart above....the grey lines are the "stock gearing for this particular bike...the blue is the modified "lower gearing"..

Note that the blue gearing, the first gear is "lower" therefore more torque...this bike will be faster off the line (all else being equal)...but then notice. ...the blue bike hits redline at about 60 mph, and has to shift to second gear...see the torque drops off significantly! At 60 mph the grey bike is still pulling, lots of torque...and it continues up to 70 mph, with MORE TORQUE THAN THE BLUE BIKE!!!!

At 70 the grey bike shifts to second, and now the blue bike has more torque....but the blue bike hits redline at 83 MPH and must shift to third gear...

The grey bike  can run second gear all the way to 87 MPH....

But look what happens at 95MPH....the grey bike in second gear has the exact same torque as the blue bike has in third gear!

again....look at 110 mph.....the  bikes are in different gears...but same torque and same speed!

Blue forth gear and grey third gear are nearly identical curves!


Grey third gear takes you just about the same as blue fifth...


Blue 6th gear peters out at redline at about 138 MPH...

Yet grey still has two more gears!

Grey 6th gear peters about at 160 MPH where the wind resistance = the thrust at the rear wheel.

But the point is...the graph is essentially identical for both bikes "in the middle"  the change in gearing only changes the bottom and the top ends

To make it even clearer:


The black line is the theoretical "perfect gearing" for that bike....note that both the blue and the grey bike generally follow that line....except for the beginning and the end.

This is why changing your sprockets only affect first gear, and 6th gear  (well 5th and 6th in the example...but there is no performance increase, or acceleration increase in any of the middle gears...

Lower ratio means better jump off the line...and slow top speed
Higher gears mean slower off the line and higher top speed


the middle are not affected...yes you may find yourself using different gears at different speeds...but the overall mid range performance is not affected.


Sorry for the long winded post...I know those who understand will "get it"...those with misconceptions will not change their incorrect thinking...
at least I had fun researching the charts and all!

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