Park Tool Bottom Bracket Tool - Hollowtech II - BBT-9

SHIMANO 6800 Ultegra 11-Speed Crankset

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Borrowing 9000 Dura-Ace technologies, the Ultegra 6800 crankset now has Optimum Power Transfer 4-arm design.

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Product Review

Borrowing 9000 Dura-Ace technologies, the Ultegra 6800 crankset now has Optimum Power Transfer 4-arm design.

New front derailleur chain guide design to reduce chain drops
Hollow glide chain rings 11 speed compatible
Made in Japan

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Park Tool Bottom Bracket Tool - Hollowtech II - BBT-9