i have a banshee with 21" tires in the rear for added clearance. I've noticed my bottom end is not as strong as when I had the small stock tires on.
If I go one more tooth on the rear sprocket or one less on the front, how much will this decrease my top end?

 

i would just drop a tooth in the front, i think there what 15 stock? so drop down to a 14 or whatever and it will prolly feel the way it was