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Pro Di2 seatpost battery mount for SM-BTR2, for 27.2 - 28.6mm seatpost

Pro Di2 seatpost battery mount for SM-BTR2, for 27.2 - 28.6mm seatpost

Pro Di2 seatpost battery mount for SM-BTR2, for 27.2 - 28.6mm seatpost

Rubber Di2 battery mount for installing SM-BTR2 battery into seatposts without mount option as standard