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The shims enable the 24mm Shimano shaft to fit the wider BB30 diameter. They enable you to fit a 24mm shaft Crankset [like the Shimano Dura Ace 9000] to a BB-30 frame [such as the Cannondale Supersix].
It is important to note these shims extend the total width of the assembly. You MAY need to use shim-washers to take up any slack, consequently, it is wise to measure the total crankset shaft length to make sure the Wheels Manufacturing BB30 Shims allow fitting your chosen chainset. For example, the Cannondale Supersix requires additional shim-washers to accommodate the length of a Dura Ace crankset.
I hope this helps.
3 months, 2 weeks ago
Adelaide SA, Australia