TIRE ROTATION VS WHEEL ALIGNMENT

Head to head

The last row is the one to say to the customer. They are complementary: rotation on the clock, alignment on the evidence.

Which one does the car need?

Bridgestone lists four signs of misalignment: uneven tread wear, a pull to the left or right, a steering wheel off centre when driving straight, and steering-wheel vibration. The trick at the counter is separating those from ordinary position wear, which rotation exists to manage. Walk it in this order.

Intervals

Rotation is a mileage job. Bridgestone’s general rule is every 5,000–8,000 miles or every six months, and USTMA recommends 5,000 to 8,000 miles when the owner’s manual gives no period. For many drivers that lands on the same visit as the oil, which is why it belongs next to the oil change interval on the service card. Bridgestone breaks it down by vehicle type:

New tires should be rotated by 5,000 miles, because deep fresh tread is the most prone to uneven wear. Alignment has no single mileage: USTMA ties it to symptoms, impacts and the owner’s manual, while Bridgestone suggests aligning and balancing every 5,000 to 6,000 miles. A sensible shop policy is to look at alignment every time the car is up for rotation and adjust only when the readings say so. Build both into the maintenance schedule builder.

What the alignment tech actually measures

An alignment is a suspension adjustment. Bridgestone describes the three angles a technician is mainly concerned with:

Camber is the lean seen from the front; toe is the in-or-out point seen from above; caster is the tilt of the steering axis seen from the side, with positive caster tilting it toward the driver. Print the before-and-after readings and staple them to the repair order.

Reading the tread before you sell either

The tire tells you which service it needs, and it is worth writing the pattern on the inspection sheet before the car goes up. Bridgestone ties each pattern to a cause:

Measure depth at each corner while you are there. USTMA puts the replacement point at 2/32 of an inch. A tire already at the limit does not need rotating — it needs replacing, and any alignment fault behind the wear should be fixed before the new set goes on.

Rotation patterns the shop should use

The pattern depends on the drivetrain, whether the tires are directional, and whether the sizes match front and rear. Bridgestone publishes the Tire and Rim Association’s patterns:

Why alignment follows suspension work

Alignment angles are set by suspension parts, so anything that moves or wears those parts moves the angles. Bridgestone names worn bearings, ball joints and other suspension parts as contributors to camber misalignment, and USTMA warns that striking a pothole can cause alignment issues. Struts are the clearest case, which is why the suspension repair cost guide treats the alignment, at $130–$180 of labor plus about $20 of supplies, as part of the strut job rather than an extra.

Writing it up