YST BB-830-Shim Fits PF BB30 for Hollowtech II cranks Shimano, FSA, Race Face and others The YST BB-830-Shim Fits PF BB30 for Hollowtech II cranks or most 24mm BB spindle crank. Threads together for a secure no creak fit. A great up grade from a OE bottom bracket. Lightweight alloy body, sealed bearings for Press Fit BB30 type bottom bracket shells. Compatible most straight 24mm spindles (Shimano type). Tool Need: 44mm outer cup diameter with 16 notches (hollow-tech II tool) bottom bracket tools to fit. The Park Tool BBT-69.4 fits perfect.