ตีนผี Shimano GRX RD-RX815 2x11 Speed Di2 Rear Derailleur ของแท้ศูนย์ไทย

Features GRX RD for 2x Di2 electronic drivetrains and max 11-34 cassette usage Shimano e-Tube Project Di2 electronic shifting component Di2 shifting precision and stability with minimal input effort, incredible shift speed Clutch design for optimized chain tension, reduced chain slap, missed gears Shadow RD+ design protects cage/assembly from damage, improves shifting plane Designed for traditional hanger systems, with direct mount option (remove B-link) Hollow B-Axle is stainless steel, with incredible stiffness Aluminum/GFRP body, pivots, axles; stiff, strong, light, w/ plated or anodized finishes 4 fluoric coated bushings keep action smooth, consistent & pivots torsionally aligned 13T pulley wheels Aluminum cage plates are durable, resilient, and light, with anodized finish Compatible with 2nd generation Shimano road Di2 Dual Control levers and GRX 1 2x Max 17T front chainring differential Works with 2x on 11-30, 32, 34 cassettes; w/ HG-EV 11-speed/HG-X11 chains Programmed electronic shifting with Synchro option- fast and accurate Single e-Tube port Compatible with all E-Tube Di2 technology including firmware updates Finish: GRX/Di2 Scheme Weight: 287 grams