Wheel alignment is the position of the wheels relative to your car. When properly aligned, the wheels point in the right direction. Without proper alignment, the wheels resist your steering commands, as well as each other. Alignment also affects gas mileage and tire wear. If your tires are pointed in different directions, they fight against each other and can cause tread wear. Computerized alignment equipment is used to measure all alignment angles on today's cars. These include both adjustable and non-adjustable angles. (Non-adjustable angles require repair or replacement of the suspension component.) These are the most common adjustable angles.