The smallest "street" bike I could find in Zero's current lineup is over 30KW. There is a curious gap currently in the market between -8KW and +30KW. 15 KW is a number I came up with by looking at the advertised power of 250cc scooters. I was looking for enough grunt to do short 55 mph stints on the highway and that is about as low as you can go. I would have been at more than $5K for my Franken-Scooter, using cheapest available parts, with questionable warranties and not calculating the work. Calculate your work, add higher quality parts, like top of range ESC and BMS, some bigger Lithium SDI batteries, some teething issues, and you can double that amount. That brings you almost exactly in the price range of brand new baby Zero S with 7.2 KW battery and 5 year warranty on it. I never got far enough to decide on a motor. Below left, similar to what I was looking at, is 8KW continuous car hub motor from Qsmotor. Up to 19KW peak. It will fit down to 14 inch car rim (check out "darksiding" ). About $800 including shipping. Comes with the brake disc, so that is money saved . On the right is a 12KW continuous, 24KW peak 13" scooter motor from the same manufacturer. I would have charged at work, they have nice setup there for electric vehicles. The few times I would've had to charge on-the-go I would've used regular charging station for enough juice to get there.