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For running your Shimano Hollowtech-II cranks in your BB30 frame the Crank Spindle Shims press fit directly into the BB30 bearings.
The shims are designed for any 24mm NON TAPERED spindle crank. Based on industry standard BB30 bottom bracket shells they're simple and easy to install and machined for an exact fit. You will need the 6806 bearings already installed into the BB30 shell to utilise this conversion.
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