ok guys, iv done my homework some more and have been very surprised at what i found. I wish to cruise around on my bike at 30mph, at first I though the 36t could do this no problem, but after further reading it seems that even the 36t to get to 30mph (which i could do easilly) would still be pushing a rather high rpm just at cruising at 30mph, so what does this mean? Should I go to the 34 or 32 tooth sprocket for what im trying to achieve? And please remember that im not driving this on public ways, so I don't care of the 25mph speed limmit for bikes were im from, im driving on private land and can go as fast as i want.