SRAM Chain Apex D1 Flattop 114Links w/PowerLock 12 Speed Workshop Tools 71001 LLB - ABEC-5 Angular-Contact

71001 LLB - ABEC-5 Angular-Contact Bearing (C3 clearance) - 12 x 28 x 8mm -

if you prefer

1 Tech 3 Duo lever offering genuine bite point and reach adjustment without tools

Shimano 105 Di2 RD-R7150

All about comfort

SRAM Chain Apex D1 Flattop 114Links w/PowerLock 12 Speed Workshop Tools 71001 LLB - ABEC-5 Angular-ContactSRAM Chain Apex D1 Flattop 114Links w PowerLock 12 SpeedFlattop technology is so much more than a distinctive look. It allows our 12 speed chain to be lighter, stronger and more durable than anything that came before. The Apex chain uses the same construction as the Rival and Force chains, with a polished grey finish. 12 speed Flattop technology allows for a narrower chain with quieter operation and increased strength and durability Includes Flattop