City & touring bike hubs - absolutely integral components
Hubs form the connection between frame and wheels and should roll smoothly with as little play as possible. For touring and city bikes, there are a few things you should consider when buying a hub. To ensure that the hub fits the wheels, pay attention to its compatibility with the other components. Consider axle type (quick-release, thru-axle or bolt-on axle), brake type (disc or rim brake) and which installation dimension the wheel has. You also have to pay attention to whether the rear hub has a hub gear or a coaster hub, and if the front hub has a hub dynamo. If so, you'll need to buy the appropriate hub.