48:17 on the road. Never had any problems.
First time I turned up with that on a group ride, everyone was moaning about how they’d have to wait for me on the climbs.
By the third hill, everyone had worked out that the only way to climb on SS is simply to hit the hill hard and that actually I was the one waiting for them.
It took them a lot longer to work out that the only time I did have trouble keeping up was if they were caning it downhill.
I’ve found the same off-road – on the occasions that we’ve been a mixed group of geared & SS, the SS riders are usually first to the top of the hill. Speed on off-road downhill is far more a function of the terrain than max gear size.