the smaller ur overall diamater (wheel+tire) the faster u will accelarate. When I put on my 16's with low profiles for auto-x the car is really FAST and the gears become closer together. If u get the lighter 18's with a low profile tire (see my sig) then u will have a diamater really close to stock. With the lighter wheel u should be faster. Get the 18's anywayz couse they look better on accords.