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Hook-Edge Rim
From WikiPedalia
A rim with a ridge on the inner edge to help retain the bead of a clincher tire, as shown in the cross section at the right. Some older rims were straight-sided, and will not hold a tire as securely as a hook-edge rim (that is, the tire cannot be inflated to as high a pressure.) Virtually all good-quality rims in current production are of the hook-edge type.
