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With this particular central movement adaptor, for SRAM and Truvativ GXP with 24/22 mm BB 386 EVO axle frame 86.5 mm installation) with PF30 bearings. (Not Shimano Pressfit BB91!), The central movement BB30 PF is left in the frame, the traction compasses are placed to the right and left of the field, and then pushed through the GXP crank. Attention BB 386 frames have another size (= 86.5 mm) BB30 (= 68/73 mm) or pressfit30 (= 73 mm) frame. Please measure accurately.