I ordered a 60T sprocket from Boy Go Fast wednesday, got it today only three days later the whole way across the country! What a monster this sprocket is, it's a flat piece of cut plate steel a little over 1/8'' thick. Looks to be much stronger and higher quality than the stock dished cast 44T sprocket. I'm waiting for my new chain to arrive so I can install it, when it's assembled I'll post a GPS verified top speed and report the torque enhancement. My bike goes too fast to cruise comforatably now, my 180lbs friend had it up to 38MPH today on level ground. When I ride it the brakes are severly over worked and won't pull up hill very good.