Sturmey Archer Rear Hub X-RK4 4sp TSS42 Disc twist
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• 6-bolt disc mount
• 4-Speed internal gear hub with gear ratio of 210%
• Gear steps of 28%, 28% and 28%
• Rotary gear selector without protrusions outside the frame
• Direct drive in 1st gear allows use of smaller chainwheels
• 6061 Aluminium hub shell
• 36 spoke holes
• Anodized alloy finish
• Weight: 1270g