Race The Distance From Columbus Carbon Lab research department, the RTD uses their Futura Gravel fork, to give an unparalleled ride. From white roads to single-tracks, from unpaved paths to city-scapes, the RTD fork supports a wide range of uses. If used in wet conditions, adventurers and commuters can benefit of the RTDs capability to fit mudguards whilst maintaining clearance for tyres up to 35mm width. Oversized clearance means that without mudguards fitted you can use 40mm width tyres, for the most demanding off-road conditions.