My Genesis Croix de Fer

I don't trust my very knobbly tyres to grip (Rocket Rons), so corner very cautiously- then I saw that AndyP had what looked to be 90% file tread with side lugs, and was going significantly faster than me through the corners.

Don't be surprised - tread just clears mud. Pressure - or a lack of it - gives you grip. No mud? Don't need no tread.