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Rideworks MTB BB's are CNC machined from a solid billet of aircraft grade aluminium. The T47 designs allow for a stiffer interface, the larger cups accommodate over size bearings. Our seals are machine in house and we also fit A/C bearings as standard for Shimano / RaceFace type BB cups. The distance across the seal faces when mounted in shell is 98.5mm *WILL ONLY FIT A FRAME WITH A T47 SHELL*
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