-1 on the front is closer to a +2.6 or 2.7 on the rear. Swapping the rear is easy, the front isn't too bad either.
Actually, from a rotational mass perspective, most folks go with an aluminum rear sprocket which is a lot of rotational mass savings back there. More-so than dropping one tooth in the front... plus with the front being so small (diameter), the resulting affects are not as great. So even though you are getting a bigger rear for all of this, it is still much lighter (assuming it's aluminum) than the stock steel rear sprocket.
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?
Getting aftermarket aluminum sprockets would help reduce rotational mass which would help with acceleration.
How is the bike affected if you change just one sprocket?
I imagine changing the front would help with quicker acceleration but what does changing the rear do?
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?
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?
I mainly stayed away cause I figured it would affect gas econ, especially since I use mine for commuting in addition to fun.