The short answer is no. There is no reason to exclude other bike types from the off-road adventure. Lightweight mountain bikes are capable to cover the distance for the moderately fit. For those not so fit or just beginning with back-country adventures, the E-bike is fast becoming the bike of choice. Vivid do provide Gravel and E-bikes for rental on the tours. If you come from road cycling, then we suggest putting a smile on your dial and rent a gravel bike.