The GRANITE-X is derived from the geometry of the GRANITE road bike model. If the speed remains high and the surface changes from asphalt to gravel and forest paths, a bike with an adjusted tire width and subtle geometry modifications is just the thing. Whether 40 mm in 700C or 48 mm for 650B is entirely up to the customer. Ideally, two wheelsets and the next multi-day bike-packing tour follows the fast ride with the club colleagues. GRANITE-X  - Versatility in its most elegant form. ride.on.rocket.