Pete,
How are you going to mount the battery in the frame down low? Most people use frame bags to go inside the frame. You could use a “bottle battery” but every one of those I have seen is 1C or less, meaning that a 36v10ah battery struggles to put out 10 amps of power. 10 amps isn’t nearly enough (and is going to give you a very short battery life).
On my E road bike I have 32mm tires (gatorskin) on the motor. It’s pretty snug with calipers – I have to back off all of the adjustments to get the wheel off. It’s happy at 80-90 PSI, so that is better than running a 120psi 23mm tire.
My dilemma was what bike to build – 26” wheel or 700c/29” wheel. So I built both. The second motor was only $79 with no shipping cost (that is huge), and I had that built into a wheel locally. The motor and the throttle/PAS are the only things that need to be mounted to the bike so building a second ebike (sharing the battery) wasn’t very expensive.
Check out my bike builds for some more ideas and thoughts (a mountain bike and a road bike):
http://www.bikeforums.net/showthread...highlight=q100