I just built a minibike its great fun but i cant drive it on the street so i decided to build an electric bike. the motor i was going to use was the MY1020 36v 1000 watt motor i did all the math for the max efficiency rpm@36v and calculating the gear ratio that would result in the best efficiency and still maintain reasonable speed, 10:1 with 26'' wheels at 25 mph putting out 570 watts on flat ground and about 15 mph on a 10% grade putting out about 1600 watts. I go to ebay to buy it and its sold out and they wont have more for 2 months, so i bought the 48v 1200 watt MY1020 model, i needed the specifications for that model so i e-mailed unitemotor and they told me that the motor is no longer in production and the specs are not available. Does anyone have the detailed specs for this motor? things like no load speed no load current torque at rated load, all the information provided was "48v 1200w@3200rpm 32A" not enough to calculate the peak efficiency speed. If anyone needs the 36v 1000 watt models detailed specs i got them from unitemotor http://www.freewebs.com/jakhole/MY1020G1000W.doc.