Shimano Ultegra Shimano SM-BTR1 Dura-Ace 7970 and Ultegra 6770

The power house of Di2 is a long-life 7.4V Li-Ion battery that is both compact and reliable taking s

Shimano Ultegra Shimano SM-BTR1 Dura-Ace 7970 and Ultegra 6770

The power house of Di2 is a long-life 7.4V Li-Ion battery that is both compact and reliable taking shifting effort away from you Excellent sealing and reliability have been proven through repeated field tests in various riding conditions including extreme temperatures rain mud and cobble stone roads Using a hard wired battery system which is both light weight and accurate compared to current wireless technology and#40;as a wireless system would require 4 batteries: one for the RD one for th

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