Ridley ASTR GRX600 2x12 / Black Metallic S / Black Metallic

Fast Riding, Smart Saving: The Ridley ASTR GRX600 2x12 in Profile

With the ASTR, the maker transfers all the strengths of the successful ASTR RS to a far more accessible price level: aerodynamically shaped tubes, a modern gravel geometry and generous tyre clearance are all part of the package here as well. This build couples the lightweight HM-carbon frameset with a sturdy, mechanical Shimano GRX drivetrain and is ready for any swift ride or gravel race on nearly every surface.

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At the heart of the bike is a frame made of HM carbon (high-modulus carbon) that carries the aero design language of the pricier ASTR RS: profiled tubes, a diffuser in the fork crown and the D-shaped steerer measurably reduce aerodynamic drag. The modern performance geometry with a 71.5-degree head tube angle, steep seating position, dropped bottom bracket and short chainstays promises stability at speed and agile handling on technical terrain. Propulsion comes from the mechanical Shimano GRX600 groupset in a 2x12 layout: two chainrings with 46/30 teeth and an 11–36 cassette produce 24 gears with a wide spread – range for long climbs just as for quick descents, plus robustness and easy servicing. You will search in vain for lighting: true to the performance philosophy, there is neither a lamp nor dynamo routing. The ASTR is only conditionally meant for bikepacking – rack eyelets are missing, but frame bags and slim aero packs work for fast multi-day trips. Highlights include the tyre clearance of 47 millimetres (in 2x mode) and 52 millimetres (in 1x mode), the 16-degree flared Deda Superzero alloy bar, the fitted 47 mm Vittoria Terreno Dry tyres with tan sidewalls, the dependable DT Swiss G1800 wheels and the comfortable Selle Italia Model X saddle.

Naming decoded: what ASTR, GRX600 and 2x12 reveal about this bike

ASTR is the family name of the platform and is pronounced "ASTor", not "ASTRa". There is no official long form; acoustically the abbreviation echoes the Latin "Aster" – the star – and underlines the core message of lightness and speed. The suffix GRX600 names the installed drivetrain tier: "GRX" is the gravel series of the component maker, while the number marks the middle, mechanical level with a very good bang for the buck. "2x12" describes the drivetrain layout – two chainrings and a 12-speed cassette add up to 24 gears. The Black Metallic paint job, a lustrous black with metallic shimmer, completes the visual picture, paired with the S frame size for more compact riders.

At a glance: how the ASTR sets itself apart from its series siblings

The ASTR is the base, Essential model of the ASTR family and deliberately sits below the ASTR RS. While the RS relies on elite-series ultra-light carbon, an aero D-shaped seatpost and the integrated Nimbus Pro cockpit and only accepts electronic groupsets, the ASTR pairs a slightly different HM-carbon layup with a round 4ZA Cirrus seatpost and a conventional Deda stem-and-bar combo – which also allows mechanical drivetrains such as this GRX600. Geometry and tyre clearance are identical between the two models, so riders who can do without the full race shelf get almost the same riding dynamics at a far gentler price. Compared with the electric E-ASTR this bike stays a pure muscle-powered machine, and versus the GRX Di2 or Force XPLR variants of the series it bets on proven mechanics instead of electronics.

Purpose: from fast gravel passes to ambitious dirt classics

The ASTR addresses everyone who wants to move briskly on gravel: it is ready for every quick ride and for gravel races on any surface, from quiet dirt lanes to hard competition courses. The sporty geometry with a low head tube and steep seat angle supports ambitious riders working on pace, while the wide tyre choice delivers grip and comfort. Unlike the Kanzo Adventure, which with rack mounts, lighting options and a relaxed position primarily targets bikepacking and long tours, the ASTR stays consistently performance-focused – it wants to ride fast rather than carry a lot. Compared with the older Kanzo Fast line it modernises aero and tyre clearance, and against the calmer all-road Grifn RS it remains the more consistent racing tool. Those who occasionally like to ride slightly loaded still find a reliable partner here, thanks to the mechanics and the generous gear range.