Chris King's Devolution headset solves a serious problem: How to match up your parts when parts standards keep multiplying? The Devolution lets you match frames and forks that would be otherwise incompatible. Got a 1-1/4-inch frame and a 1-1/8-inch fork? King has a headset that will make that combo work. How about an older 1-inch threadless fork and a shiny new 1-1/8-inch frame? That's a possibility, too. No shims, no special adapters, just the parts you need to make sure all your bike parts play nice.