Why are wheels for single speeds so heavy? I can see 2 reasons. 1. They use at least 32 spokes and the spokes are always straight (ie not butted). Why do we need so many spokes and why not butted? 2. They have solid axles. Has anybody any idea if a quick release with a chain tug to stop the axle pulling over would work? It might save weight and would be easier to get on/off when fixing punctures. Can you change the axle form solid to quick release? Any ideas anyone?