Okay...I'm a sproket noob but let me see if I got this right.
Stock sprockets are a heavy steel or some other material correct?
Stock = Steel
Getting aftermarket aluminum sprockets would help reduce rotational mass which would help with acceleration.
Aftermarket front sprockets are still steel, rears can be steel or aluminum. If you go w/an aluminum rear, it will have less rotational mass, but not sure you'll notice a big difference. You will notice the biggest difference due to the dropping teeth in the front and/or adding teeth to the rear.
How is the bike affected if you change just one sprocket?
If you drop teeth in the front OR add teeth to the rear you will improve acceleration. However your total top end ability of the bike will also drop.
I imagine changing the front would help with quicker acceleration but what does changing the rear do?
If you add teeth to the rear it is like dropping teeth from the rear... both improve acceleration.
Does this affect gas economy? or not really as it doesn't affect the gearing and its still all based on how you are with the throttle?
Your cruising RPMs will be higher and in essence could affect fuel mileage. Doubt it will do much more than 1-2mpg and maybe even no measurable/consistent impact. You'll have more impact by how much the right hand likes "to play".
[QUOTE=MDeezy;337233]Since the stock sprockets are of a heavier thicker metal material, i'd imagine they last a lot longer. Since aftermarket stock ones are aluminum I'd imagine their lifespan is half? Steel sprockets will last longer than aluminum. Not sure exactly how much longer.
I mainly stayed away cause I figured it would affect gas econ, especially since I use mine for commuting in addition to fun.
A cheap test to see if you like it and if your fuel mileage is impacted much, if any, would be to drop one tooth in the front. Cost will only be about $25-$30 and if you don't like it you can easily swap it back and sell it to someone else. Rears are probably $60-$70.