The fitter at my LBS measured my sit-bones again at my request, and came up with the same basic measurement - it just changed from 11 to 11.5cm - so that would be 115mm. That seems narrow to me - but it was the same basic measurement two times in a row.

So the B17 is on my LHT, and I got it from my LBS since I could pick it up for a much lower price than Wallbikes - though I will regret that if I have to switch. In my short 2 mile ride when I brought my LHT home it seemed fine - indeed I didn't even notice the saddle at all. But that was only two miles - if that far. Seated on the trainer it seemed to me that perhaps my sit-bones were a little close to the edge, but that may not have been correct.

Stella still has the stock saddle she came with, and so far that is comfy - we will see once I start building my mileage base. 15 miles is one thing, if the B17 works out then I will probably just go ahead and switch Stella's saddle out as well just to be safe.