Yes but don't forget that road riding generally entails better surfaces than city riding where potholes, train tracks and other unexpected obstacles are a lot more common. Not only that, but a lot more people riding fixed do lots of curb hobs and possibly some bunny hops here and there, whereas a lot of roadies wouldn't dream of doing these things (of course, there are the cool ones who race cyclocross in the off season and get a kick out of curb hopping their nice road bikes and taking off-road detours; I like those guys). Rear wheel for city riding, 32-36 spokes is the best bet for anyone over 160lb IMO. Front wheel varies.