Schwalbe offers a formidable and comprehensive line-up of gravel tyres, with the three Pro models occupying the top tier. The G-One RS Pro is a semi-slick, the G-One R Pro is a general-purpose, small block tyre, whilst the G-One RX Pro is the most aggressive of the range. I would stop short of calling it a full-on mud tyre (I think Schwalbe’s G-One Ultrabite is even more aggressive), but the RX Pro certainly looks like it could cope with most conditions.
In a telling reflection of modern trends, the RX Pro starts at 40mm, and is available in up to 55mm width, in both black and ‘transparent’ (tan) side walls, so read no further if your frame doesn’t have at least 40mm of tyre clearance. Furthermore, there is no 650b option at all for small wheel fans.
