CeramicSpeed Bottom Bracket - T47a - 24mm SpindleT47a Bottom Bracket for Shimano T47a for 77mm asymmetrical shell. T47a is a threaded bottom bracket shell design, utilizing the oversized interface of BB right, but with the benefit and peace of mind of a threaded interface. Compatible frames feature an asymmetrical 77mm shell width, placing the non drive side bearing within the frame, and the drive side bearing externally. Equipped with precision dust covers for a snug & secure fit that also fully
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