Finished in a striking Sterling Gloss (a metallic silver/grey), this model moves to a 1x drivetrain to maximize mud clearance and chain security. It retains the premium Reynolds 725 heat-treated steel frame but pairs it with a Chromoly thru-axle fork (rather than carbon), prioritizing absolute durability and load-carrying confidence over shaving every last gram.
Frameset & Geometry
Frame: Reynolds 725 Heat-Treated Chromoly, 12x142mm Thru-Axle, Internal Routing
Fork: Amplitude G100 Chromoly Disc, Triple Anything Cage Mounts, 12x100mm Thru-Axle
Handlebar: Amplitude G100, 16-degree flare
Stem: Amplitude G100, +/- 7 degree
Seatpost: Amplitude G100, 27.2mm
Saddle: Madison Flux Switch
Colour: Sterling Gloss
Drivetrain & Brakes
Shifters: Shimano GRX ST-RX610, 12-speed
Rear Derailleur: Shimano GRX RD-RX822 (Shadow RD+ Clutch)
Crankset: Shimano GRX FC-RX610-1, 40T Single Chainring
Cassette: Shimano CS-M7100, 10-45T, 12-speed
Chain: KMC X12
Brakes: Shimano GRX BR-RX610 Hydraulic Disc
Rotors: Shimano SM-RT64 CenterLock, 160mm
Wheels & Tires
Wheelset: Amplitude G100, 26mm internal width, Tubeless Ready (Valves Included)
Hubs: KT T20 (Front) / RR615 (Rear), CenterLock, Thru-Axle
Spokes: Double Butted 14g Stainless Steel
Tires: Maxxis Rambler, 700x45c, Tubeless Ready (TR), EXO
Max Tire Clearance: 700x47c (45c with mudguards)
Key Features & Capability
1x12 Shimano GRX: By eliminating the front derailleur, the CdF 40 becomes a much more capable mud-plugger. The 40T front ring paired with the wide 10-45T cassette provides a massive range that covers both high-speed descents and vertical climbs.
Reynolds 725 Durability: This heat-treated steel provides the legendary "zingy" ride quality of the Croix de Fer range but is strong enough to handle the extra stress of technical off-road riding.
Chromoly Thru-Axle Fork: Unlike the carbon fork on the 50, this steel fork is virtually indestructible. It’s the perfect choice if you plan on mounting heavy "Anything Cages" or front racks for a multi-month expedition.
Dropper Post Ready: The internal cable ports are designed to make adding an internal dropper seatpost a breeze—a rare and welcome feature for a steel adventure bike.