You should only have to replace a wheel bearing after miles & miles of cycling, however it is something that can fail sooner than you think if it's not properly looked after. Part of taking care of your wheel bearings means replacing them as soon as you notice something is amiss.
For a step-by-step guide on how to replace a wheel bearing, watch this handy how to video.
Once you know what you want from your tyres, figuring out the ones suitable for you and choosing the right tyres for your bike is a smooth operation. Each bike and discipline requires its own specific tyre type and certain tyres are suited to specific terrain.
Learn about choosing the right tyre for your bike by watching this how to video which gives you expert advice.