Surly 10-12 Adaptor Washers Having the right wheel hardware can make or break your ride, which is why it's so important to make sure you're running the right parts. Having the proper washer for the type of wheel you're running is important because a 10mm bolted axle won't fit through QR washers, and QR springs wont catch the face of a bolted version. So, for the best results, order the correct odds and ends, and enjoy a smooth ride. Features Varying diameter features 6 or 10mm axle compatibility, for bolt on or quick release hubs | Surly | 10/12 Adaptor Washers 6Mm For Qr, Pair