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Replacement rear bolt thru-axle for the Ribble Ultra-Aero SL R / SL carbon frameset platforms. This lightweight yet robust axle features a 6 mm Allen head and minimal taper design that allows you to mount your wheel safely and securely for complete peace of mind. Hub Spacing: 142x12 mmAxle Length: 173 mm Thread Pitch: 1.5 mmHead: 6 mm Hex