Ease your road bike racing to uphill without any sour legs, simply keep your Shimano and install Relic R40T sprocket to upgrade Shimano road derailleur gear ratio to 363% with less money but enhance best performance.  The oversized R40T kit combination with 16T not only work smoothly but also upgrade Shimano 10 spd cassette with a 28T cog or 11 spd cassette with a 32T cog.

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• Material: AL7075 T6 CNC machined (R40T)
•               Chrome Steel (16T)
• Cassette progression: Shimano 10 spd (11-28T) & 11 spd (11-32T)
• Sprocket weight: R40T (56g), 16T (19.5g)
• Kit includes: R40T, 16T and road extend hanger
• Color: Black & Green (R40T)
•              CP (16T)
• Remark:
• if you have questions about building R40T sprocket, please move to CATALOG for further information.