Well, yes. My mtb is dahon Cadenza xl with 39t/18t chainring/rear cog. This, with 2" tyres gives 47.5 gear inches in the 4th gear (according to sheldon’s calculator). This gear gives me 20-22km/h with comfortable cadence. 25 km/h if I spin really fast =)
Strida SD with 18" wheels has 48 gear inches according to this post. So it looks like what I need.
I would have preferred something closer to the original strida 5 gear (53 gear inches), but, while finding/ordering bespoke chainring (90t?) might be an overcomable problem, finding a source of custom-length belts would be much more troublesome…