Surly Hurdy Gurdy Silver
Hurdy Gurdy is a nifty device that keeps your rear wheel from slipping forward in the dropout under pedal load. It’s designed for semi-horizontal front-loading dropouts (see second photo for an example). Hurdy Gurdy is investment cast of stainless steel for durability. Its two axle holes allow for a wide variety of fore/aft wheel positions. It will work with standard QRs, bolted axles, and nutted axles up to 10mm.