That's a good question Geoff. I've been occupied today with other things but now I've had the reminder I'm up for starting it off if as I'll be free by then.
I'd love to see you put that ebike on the Kickr as I had a good look at some of the latest mtb ones recently, not that I'd get one, but they do look very impressive. Seriously, do you think you could do it sometime and race us to see what it can do? I think we need a test to see if a UK legal one can beat a reasonably fit person on a racer. No pedalling of course
On a climb it would win hands down, the problem would come elsewhere, as it is limited to 25 kph and would stop assisting above this. Then it's just a heavy mountain bike.
On Alpe d'Huez or Ventoux though, it could average 25 kph up it, as it would kick out 250 W of assistance and a fit rider could provide another 250 W or more. 500 watts average should make about 15-16 mph. Less than 30 minutes up Alpe d'Huez would hardly tax the rider or the battery! Coming down again would be fun as well.
If they release a proper road bike version, with no suspension, drop bars, and about 5kg less than the mtb one I'd find it hard to resist. As it is, a mtb bike that can fly up steep climbs and with a range of 40-60 miles but needs no license, insurance, registration, petrol, minimal maintenance ... Yes please!
Geoff
P.S. His is the £2400 Trek Powerfly+ 7 hard tail. Nice looking mtb.