im on that gear calculator with the skid pad converter. there are no hills when i do ride it around town. but i do plan to track. i was going to throw a front clamp break on it a put a flip flop rear. than just flip it when i go to the track. im pretty sure i can keep up a good tempo/speed. this may sound ******** but can any size main, and cog mesh? i think i can go something bigger than that.