Lehner Basic XL 2800 on 24 volts?

[extremexmods]

I know the Lehner Basic XL motors are limited to 65,000 rpm. The rpm/volt quoted for the Basic XL 2800 is 2800 on the Lehner website. With 24 volts this works out to be 67,200 rpm. If this is the unloaded speed, would the loaded speed in a dual brushless powered e-maxx with this motor on 24 volts be less than 65,000 rpm? I was thinking about BK Electronics 12020 Warrior Controllers, 2 Lehner basic XL 2800 motors, and 20 cells. I would parallel wire the 2 speed controllers to get the full 24 volts with out having to use a total of 40 cells. Would this work, geared 20 or 21 tooth pinions and 66 tooth spur?

Speed chart for idea of speed

http://qcda.com/emaxx/speedchart.asp