I don't think my bike could hit 30 going downhill
Then again, I have 28" wheels and the first thing I did was replaced the stock 41 with a 56 tooth gear. Speed here is not inportant, getting up hills is. From what I've read in the bike forums I might have one of the most modified motors as far as bolt on's go. Everything external has been up-graded. When I get a new 49cc I'll be tearing into the 66cc and modding everything possible to make more power and the up-grades needed to handle the output. Right now I've started on that; clutch improvements were needed with what I've done already. It now wants to wheelie when I start it! I have to lean forward to keep weight on the front wheel.
New motor the first of June, hopefully Spooky Tooth is back online by then