Bent or buckled wheels
The back rim (or inner rim) of a wheel is quite malleable as there are no spokes supporting it to the wheel centre. An impact will deform this rim either by squaring off an area or areas (think of a 50p shape rather than a 10p) or bending the rim out away from the tyre. Both will result in vibration through the car or steering wheel, and often a loss of tyre pressure. If left unrepaired it can cause damage or premature wear to suspension components and tyres too. Repairs are carried out using a combination of heat, hydraulic rams and rollers and are virtually 100% successful with no lasting effects to the wheel.