The Ridley ASTR GRX600 2x12 embodies the "aero-to-weight" philosophy applied to gravel racing: a versatile HM carbon bike that combines aerodynamic performance, low weight and modern geometry to dominate both gravel races and fast rides on all terrains. Shimano GRX600 2x12-speed drivetrain, tire clearance up to 47mm with double chainring setup and tubeless ready wheels, all at an accessible price point (from €3,299).

Technical Summary

The Ridley ASTR (Essential Series range) incorporates all the innovations of the high-end ASTR RS and makes them accessible. The HM carbon frame weighs 1090 g in size M (±10%, raw frame), only 200 g more than its RS big brother, while maintaining aerodynamic profiles and optimal stiffness. The ASTR carbon fork integrates a crown diffuser to improve airflow and a D-Shape steerer to enhance directional stiffness. Designed for ambitious gravel racing, the ASTR prioritizes speed and efficiency without compromising comfort or versatility.

Technical Highlights

• Aero-to-weight: Ridley no longer makes you choose between aerodynamics and light weight. The ASTR delivers aero performance comparable to the Kanzo Fast, while remaining light thanks to an optimized carbon lay-up and profiled tubes without excess weight.
• Modern Performance geometry: Head tube angle 71.5° (M/L/XL) for quick and precise steering, steepened seat tube angle at 74° for better power transfer on climbs, short chainstays of 425 mm to maintain liveliness and acceleration responsiveness.
• Generous tire clearance: Up to 47 mm in 2x (52 mm in 1x) to accommodate large tires offering grip, comfort and terrain versatility.
• Lowered bottom bracket (75 mm): Lower center of gravity for increased stability at high speed and in technical descents.
• Reduced head tube height: More aerodynamic and aggressive position, suited to the gravel racer.
• Shimano GRX600 2x12sp groupset: Dedicated gravel drivetrain with 46-30 chainrings and 11-36 cassette, GRX 800 rear derailleur (medium cage 36T max), ergonomic GRX600 levers, Flat Mount disc brakes for powerful and progressive control.
• DT Swiss tubeless ready wheels: Reliable DT Swiss 370 hubs, G Classic aluminum rims (or G1800 depending on version) with 25mm depth and 24mm internal width, tubeless compatible for low-pressure riding.
• Removable front derailleur mount: Allows conversion to 1x setup if needed, without compromising frame aesthetics.
• Modern standards: BB86 bottom bracket, 12x142mm thru-axle (rear) and 12x100mm (front), Flat Mount brakes, round 27.2 mm seatpost (4ZA Cirrus) for maximum flexibility and comfort.

Drivetrain and Equipment

The Shimano GRX600 2x12-speed is the reference gravel groupset for intensive and versatile use. The 46-30 chainrings paired with the 11-36 cassette offer complete gearing, from steep climbs to fast rolling sections. The GRX 800 rear derailleur (higher model than the 600 series) ensures precision and reliability, even on rough terrain. The ergonomic GRX600 levers and Flat Mount disc brakes provide control and modulation in all conditions. The Continental Terra Speed 700x45c or Vittoria Terreno Dry 700x47c tires (depending on version) in tubeless ready prioritize rolling speed and grip, while allowing reduced pressures for more comfort and traction.

Geometry and Standards

The ASTR geometry is designed for competitive gravel racing. A 71.5° head tube angle (M/L/XL) for incisive handling, a 74° seat tube angle to optimize power in the seated position, 425 mm short chainstays for liveliness, and a 75 mm lowered bottom bracket for stability at high speed and in technical sections. The Stack/Reach in size M (571/406 mm) offers a slightly aggressive but adjustable position thanks to adjustable stem height. Available in 5 sizes (XS to XL), the ASTR adapts to all body types. The modern standards (BB86, 12mm thru-axle, Flat Mount, 27.2 mm round seatpost) ensure compatibility, stiffness and ease of maintenance.

Cockpit and Finishing

The Deda Superzero Alloy Gravel handlebar (width 400-420mm depending on size, flare 16°, drop 120mm, reach 75mm) offers long-distance comfort and control on technical singletrack. The Deda Super Box stem (90-100mm) ensures stiffness and steering precision. The 4ZA Cirrus 27.2mm seatpost (zero offset, 400mm length) provides additional vertical comfort thanks to its controlled flexibility. The Selle Italia Model X or Model A saddle (depending on version) completes the equipment. The paint finish varies between Glossy and Matt depending on colorways, all refined and elegant: Black Metallic/Bronze Gold, Empress Grey/Anthracite Metallic, Rich Orange Metallic…

Available Variants

• Size XS variant: Ref. SBIASTRID076 (AST02As, Black Metallic/Bronze Gold, Glossy) or SBIASTRID081 (AST02Bm, Empress Grey/Anthracite Metallic, Matt) — Stack 536mm, Reach 376mm, stem 90mm
• Size S variant: Ref. SBIASTRID077 (AST02As) or SBIASTRID082 (AST02Bm) — Stack 550mm, Reach 392mm, stem 90mm
• Size M variant: Ref. SBIASTRID078 (AST02As), SBIASTRID083 (AST02Bm) or SBIASTRID098 (AST26D2s) — Stack 571mm, Reach 406mm, stem 90-100mm
• Size L variant: Ref. SBIASTRID024 (AST01As), SBIASTRID079 (AST02As) or SBIASTRID084 (AST02Bm) — Stack 595mm, Reach 419mm, stem 100mm
• Size XL variant: Various refs. depending on colorway — Stack 619mm, Reach 432mm, stem 100-110mm

All variants share the same ASTR HM carbon frame, the same Shimano GRX600 2x12sp drivetrain and the same technical standards. Only the colorways, finishes (Glossy/Matt) and equipment details differ (DT Swiss G Classic vs G1800 wheels, Continental vs Vittoria tires). The recommended retail price ranges from €2,899 to €3,299 depending on versions and markets.