1)
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12 drive sprocket WILL give more acceleration than a 13...... if you DON'T change the DRIVEN sprocket at the same time.... That's not complex physics! That's EXACTLY what is stated above..... Alan has made the reasonable assumption that the guy is going to change the driven sprocket, too..... even though he doesn't SAY so!
However, when most people change the Drive sprocket, they change the DRIVEN one as well. If the Ratios are the same, then the acceleration will remain almost utterly IDENTICAL.
Eg:-
10 drive, 70 driven
..... is almost PERFECTLY identical to:-
11 drive and 77 driven
2)
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Yes, smaller drive sprockets cause more heat for the reasons given in the thread above.
However, the increase in heat is MINUSCULE...... Just try grabbing a chain on a 13 sprocket kart the instant you stop after the race.... you'll find QUITE how hot the chain is...... Trust me.... wear GLOVES when you do it!
3)
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If you use a 12 tooth drive gear, you can use a smaller DRIVEN sprocket for the same 'ratio'. The advantage is that you are not so likely to 'kerb' the DRIVEN sprocket that's being used with the 'correct' small DRIVE sprocket than if you were using the correct LARGE drive sprocket. On short circuits, this can be very important but have NOTHING to do with acceleration
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As John said, a Ratio of 7:1 is a ratio of 7:1 whether it's 10/70 or 11/77
Ian
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