11-09-13, 10:50 PM
without going too much into detail:
the standard final drive ratio for the fazer is 3.200 (15 teeth at front, 48 in rear). changing up a tooth at the front will give you a final drive of 3.000, and changing down to 14 teeth on front will give you a final drive of 3.429.
if these numbers dont mean anything to you, all they mean that is that (in the case of a standard setup) for every 3.2 times the front sprocket rotates, the rear wheel will spin once. the smaller this number, the less turns it takes to rotate the rear wheel once. this means for any given RPM of the engine, the rear wheel will be going round faster, and so the top speed will increase (but the acceleration will decrease by the same top speed gain).
the same can be said about going the other way, it will take more turns to rotate the back wheel and so the top speed will come down, but torque and acceleration will increase a given amount. you can work this out in the % difference between the gear ratios for a rough guide (real world changes will vary slightly from the theory in my experience, but its a good starting point).
so if you go down a tooth from 15 to 14, you will lose 6.68% of your top speed, but gain the same in acceleration/torque.
If you go from 15 to 16 teeth, you will lose 6.25% of your acceleration/torque, but gain the same in top speed.
As I say, take some of these with a pinch of salt, because increased wind resistance etc will affect top speed as well, so this is by no means exact...
...I think :rollin
the standard final drive ratio for the fazer is 3.200 (15 teeth at front, 48 in rear). changing up a tooth at the front will give you a final drive of 3.000, and changing down to 14 teeth on front will give you a final drive of 3.429.
if these numbers dont mean anything to you, all they mean that is that (in the case of a standard setup) for every 3.2 times the front sprocket rotates, the rear wheel will spin once. the smaller this number, the less turns it takes to rotate the rear wheel once. this means for any given RPM of the engine, the rear wheel will be going round faster, and so the top speed will increase (but the acceleration will decrease by the same top speed gain).
the same can be said about going the other way, it will take more turns to rotate the back wheel and so the top speed will come down, but torque and acceleration will increase a given amount. you can work this out in the % difference between the gear ratios for a rough guide (real world changes will vary slightly from the theory in my experience, but its a good starting point).
so if you go down a tooth from 15 to 14, you will lose 6.68% of your top speed, but gain the same in acceleration/torque.
If you go from 15 to 16 teeth, you will lose 6.25% of your acceleration/torque, but gain the same in top speed.
As I say, take some of these with a pinch of salt, because increased wind resistance etc will affect top speed as well, so this is by no means exact...
...I think :rollin