hillzofvalp
100 kW
Justin comments in email:
I had specified the dropouts in my CAD diagram to be 6mm (1/4") thick chromoly plate and included a pair of threaded holes so that we can make a no-nonsense single piece bolt-on torque arm. Here is a screenshot.
The spacing between dropouts was spec'd at 138mm so that it could better 7-8-9 speed freewheels with existing hub motors. However, I can't totally guarantee 100% that that's how the production frames actually wound up as a lot of things seem to get lost in translation regardless of how much you try to be clear. Our shipment is due to arrive in 3-4 weeks, so I'll know for sure then what actually got built. But dropout strength should not be a concern.
The motor that will be stock on the Xtracycle supplied units is the V2 eZee hub, along with a 25A controller, so at 36V it's good for just over 700w of output power, and at 48V it is just over 900w. But for us we'd be supplying with whatever motor people want on the back, and I wanted to make sure we can accommodate that.
Oh and the slot itself was naturally spec'd at 10.0mm opening, with a 14mm radius on the top. I didn't provide tolerances, but they know that the motor axle has to fit in there.