Shimano's first carbon gravel front wheel is purpose-built for unpaved riding — light at 639g, tubeless-ready from the box, and shaped around a 25mm internal rim width that keeps 32–50mm tyres planted and stable at lower pressures. The WH-RX870 brings full-carbon construction to the GRX line without compromising the day-long reliability that defines the groupset.

Highlights

• Full-carbon rim: 32mm depth, 25mm internal / 30mm external width for an optimal gravel tyre profile.
• Tubeless-ready: Pre-installed rim tape means you can go tubeless straight out of the box.
• Lightweight build: 639g front wheel keeps unsprung weight low on rough terrain.
• 24 straight-pull bladed spokes: External alloy nipples for easy spoke tension adjustment in the field or workshop.
• Cup-and-cone hub bearings: Time-proven system prized for long-term serviceability and home maintenance.
• Centre Lock disc interface: Compatible with Shimano Centre Lock rotors across the GRX and road range.
• 12×100mm thru-axle: Stiff, precise front-end feel on technical gravel and mixed-surface terrain.

Carbon Rim Design

The 32mm shallow rim profile balances aerodynamics and crosswind stability on exposed gravel routes. At 25mm internal width, the rim supports tyre widths from 32mm up to 50mm, allowing the tyre casing to assume a more rounded profile for better cornering grip and lower rolling resistance at reduced pressures. The hooked bead design ensures secure tyre seating in tubeless configuration.

Hub & Spoke Build

Twenty-four straight-pull bladed spokes lace to Shimano's GRX-specific alloy hub with cup-and-cone bearings — a system well-regarded for long-term serviceability and ease of home maintenance. Contact seals shield the bearings from mud, grit, and water ingress common on gravel riding. External alloy nipples make spoke tension adjustments straightforward in the field or workshop.

Compatibility & Fit

Fits 700c frames with a 12×100mm front thru-axle and Centre Lock disc brake mounts. Recommended tyre range is 32–50mm (622mm bead diameter). Compatible with Shimano 11-speed and 12-speed road and gravel drivetrains. Tubeless sealant and valves are not included — use a dedicated gravel tubeless kit for first-time set-up.