201 rpm is at 36v. A 36v battery will be 40v, so you get proportionally more speed. I have a 201 rpm front one, which used to to do about 18 mph, but then I discovered that you can get more speed by joining the green and black wires on the three speed switch connector on the KU93 controller. I don't understand how this three speed switch works because on my code 13 500w rear with KU123 controller, I get about 20% boost, on my Dahon with Q100 and KU63 about 10%, but on my 350w CST (same internals as BPM) the speed increases from 20mph to 33mph!. On other bikes/motors, I get no boost with the same controllers. Saneagle got about 15% with his Q128 and KU63.
If you get the 36v 201 rpm version and run it at 48v, you'll get 33% more speed.
BMSBattery have sent Code 17, code 15 and code 13 as 201 rpm versions, but the different versions have a huge difference in speed. You could try asking them first which ones they'll ship. Youmight get a more sensible answer from Greenbikekit.com.
The code 13 to me is the best because it has very strong climbing with KU123 controller and will easily maintain 20 mph on the flat
