yes sure, many Strida users would like to use an IGH…
Just, there is none on the market which can be used on a single side mount - take a look at the common ones - all of them are intended to be mounted on two points.
A while ago there was a single-side IGH presented by (oh well…I believe it was Cannondale?), but it’s still just a prototype.
Moreover that are (even if single sided) IGH’s not that narrow - too wide for the extremely narrow Strida hubs…
Why do you think they (Ming) did so much work with the development of the EVO bottom bracket drive?
Answer: Because there’s simply not other possibility to get more gears (besides the unreliable ATS and the expensive Schlumpf two speed drives).
To the mentioned difference, mainly
5.0 → 16 inch metal wheels, metal bottom bracket
SX → 18 inch wheels, metal bottom bracket
LT → 16 inch plastic wheels, plastic bottom bracket
There might be also other little differences regarding supplied accessories, but these are depending on the local distributor and their taste, too.
There’s nothing private about this question. I’m obviously not the only potential customers who’d buy a Strida if it had a wider range, although I understand that coming up with a new frame is not a minor change:
I’ll keep any eye on what comes out of Eurobike 2015.
As mentioned above, I didn’t even calculate if it would be possible to use the (newer) Pinion drives - regarding primary ratio and the possible chainwheel - pulley combinations.
(I believe it would be necessary to switch to chain drive.)
The EVO drive is made by Sturmey-Archer, exclusively for the EVO