Wheels Manufacturing SOLO-SPEED Cog - 21t Fits SOLO-SPLINE SOLO-XD kits Blue MFPN=F9984 GRX BR-RX400 Disc Brake CaliperShimanos

GRX BR-RX400 Disc Brake CaliperShimanos ICE technology provides excellent heat dissipation

Left lever has no shifter parts for a clean dedicated 1x setup

CNC Machined 6061-T6 Aluminum Platform Injection Molded Copolymer Interface

}Wolf Tooth Tanpan 10-Speed Conversion

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Wheels Manufacturing SOLO-SPEED Cog - 21t Fits SOLO-SPLINE SOLO-XD kits Blue MFPN=F9984 GRX BR-RX400 Disc Brake CaliperShimanosWheels Manufacturing SOLO XD Cog 21t Blue. Wheels Mfg. SOLO XD and SOLO SPLINE Single Speed cogs are constructed with high end 7075 aluminum and designed with narrow to wide alternating tooth pattern allowing for superior chain retention. Cogs are optimized for use with Wheels Mfg. SOLO XD XD XDR and SOLO SPLINE Single Speed Conversion kit carrier systems only. Crafted with high end 7075 aluminum for light weight and extreme durability Cogs are