2 simple questions! :)

[Rilot]

Purely a longevity increase. No performance benefits at all unless you start messing with the number of teeth.

 

[satanicguardian]

How do teeth affect the performance? :O

 

[Kreeeee]

If you change the ratio between the teeth on the front and rear sprockets, it's like changing gears on a bicycle.

 

[satanicguardian]

Ohh I see, should have guessed really.. I still haven't had enough coffee or tea today to function properly, I'm like a zombie till I've had my fix!