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Compatibility- 2x12-speed
Developed with the ethos of reducing weight and adding style
Dimension NDR reduces compression of soft tissue
It's no wonder Wirecutter's review frankly admits "we don't say this often
Shimano Tiagra RD-R4000 11 Speed Rear Derailleur (Black) Brand-Zone 3 Compatibility- 2x12-speedThe Shimano Tiagra RD R4000 rear derailleur is designed for modern 2x11 speed road drivetrains, delivering smooth, precise, and reliable shifting performance. Featuring a compact and refined construction, it combines lightweight materials with durable engineering to ensure consistent operation across varied riding conditions. The integration of Shimanos Shadow RD design provides a low profile structure that enhances stability, reduces chain slap, and
