Wheels are magic. Wheels are easily as important as the frame and fork when it comes to influencing how a bike rides and feels. A lot of experienced road cyclists have several sets of wheels to call upon depending on the task in hand and the time of year. Lighter wheel rims can shave seconds of your speed in the hills and make your bike feel more responsive. Deeper section aero wheels, while being heavier can also improve your speed but the benefit will only be felt at higher speeds. Deep section rims can also handle strangely in strong winds. There's also the choice of whether to stick with normal clincher type wheels or branch out into the weird and wild world of tubular wheels and tyres.