Gravel Bike Product

Overview

A gravel bike is a drop-bar bicycle designed for surfaces between smooth tarmac and singletrack: dirt roads, forest doubletrack, washboard gravel, and the paved links in between. The category took its modern shape around 2015–2018 when disc brakes, tubeless tires, and wide-range single-chainring drivetrains converged. Compared with a road bike, the geometry is slacker and longer (head angle around 70–71° versus 73°), the bottom bracket sits lower, and the frame clears tires two to three times the volume.

The machine is organized around the Frameset: a Frame in carbon or aluminum with a dropped driveside chainstay that creates clearance for 45 mm-plus rubber without lengthening the rear end, paired with a full-carbon Carbon Fork. Wheels clamp in with 12 mm Thru-Axle Pair, which locate the disc rotors repeatably in a way quick-release skewers never did. A sacrificial Derailleur Hanger protects the frame in drivetrain strikes common on rocky descents.

How it works

The tubeless tire is the core technology. In the Tubeless Wheelset, each Tubeless Tire seats its bead against a shelf in the Rim, the spoke bed is sealed with tape, and a Tubeless Valve valve inflates the chamber directly. With 40–60 ml of latex Tire Sealant sloshing inside, punctures up to about 6 mm seal themselves in a wheel revolution or two. Removing the inner tube removes the pinch-flat failure mode, which is what allows pressures of 1.5–2.5 bar — less than half road pressure. At that pressure a 42 mm tire deforms around gravel instead of bouncing off it, which is simultaneously the suspension, the grip, and much of the comfort of the whole bike.

The Drivetrain is typically 1x12. A single 40–42T narrow-wide ring on the Crankset — alternating thick and thin teeth filling the chain's alternating link widths — replaces the front derailleur entirely. Range comes from the Cassette, a 10–44T cluster spanning 440 %, shifted by a Clutch Rear Derailleur whose friction clutch resists cage rotation so the Chain cannot slap the chainstay over washboard. The Shift/Brake Levers integrate everything at the hoods: each lever blade is a hydraulic brake master cylinder, and the right-hand paddle indexes the derailleur.

Brakes and contact points

The Brake System uses flat-mount hydraulic Brake Caliper units on 160 mm Disc Rotor discs. Disc brakes matter off-pavement for a simple reason: the braking surface is at the hub, not the rim, so mud, dust, and water picked up by the tire never reach it, and a dented rim no longer means a pulsing brake. The sealed Hydraulic Hose runs and Brake Fluid column also need no adjustment as the Brake Pads wear, because the caliper pistons self-advance.

The Cockpit centers on the Flared Drop Bar, whose drops splay outward 12–16°. The flare widens the grip by 40–80 mm exactly where the rider holds the bar on rough descents, adding steering leverage without widening the hoods position used for cruising. A short 70–90 mm Stem keeps steering calm, and thick Bar Tape damps the high-frequency buzz that gravel feeds into the hands. At the other contact point, the Seating group pairs a short-nose Saddle with a 27.2 mm Seatpost — the narrow diameter is a deliberate compliance choice, flexing several millimetres under impacts where a 31.6 mm post would transmit them.

Carrying capacity

What separates a gravel frame from a road frame with big tires is the Accessory Mounts package. A typical frame offers three or more bottle positions (Bottle Cage, including under the down tube), a Top-Tube Bag Mount for a bolt-on bag at the stem, and Fender Eyelets for full fenders or a rack. The fork adds Fork Cargo Boss Set — a three-bolt pattern on each leg rated around 3 kg — which turn the bike into a self-supported touring machine. Loaded bikepacking setups routinely carry 10–15 kg of gear this way without panniers.

Variants

The category spans race gravel (steeper, lighter, 40 mm tires, sometimes 2x drivetrains with 48/31T cranksets for tighter gear steps) to adventure gravel (slacker, 50 mm+ clearance, suspension forks with 30–40 mm travel, dropper posts). 650b wheels with 47 mm tires interchange with 700c on many frames, keeping the same rolling diameter while adding volume.