Why does a wheel shake at 50-70 mph?
At motorway speed, a wheel that is out of balance by roughly 5-10 grams can send a shimmy through the steering wheel, seat or floor pan. The fault is usually a missing or displaced wheel weight, a tyre that has worn unevenly, or a rim that has picked up road damage. A spinboss mobile balancing visit brings the balancer to the vehicle, so the wheel can be spun and corrected without a workshop queue. The result is a wheel assembly that rotates evenly at speed, not just at idle.
What does a spinboss mobile balancing visit include?
The technician removes each wheel, mounts it on a balancing machine, and measures static and dynamic imbalance. Static imbalance creates a bounce; dynamic imbalance creates side-to-side wobble. Correct weights are fitted to the rim, usually on the inner and outer planes, and the wheel is re-spun to confirm the reading. On a mobile spinboss call-out, the van also carries a torque wrench and tyre pressure gauge, so the refit ends with the correct tightening sequence and pressures.
Which checks should happen before the van arrives?
Three checks save time and prevent a repeat visit:
- Tyre pressures: set them to the vehicle placard cold, not to the maximum printed on the sidewall.
- Tread and damage: look for bulges, cuts or embedded screws; balancing cannot cure a structural tyre fault.
- Wheel cleanliness: heavy mud or brake dust on the rim can mask a weight position and give a false reading.
If a tyre has a sidewall bulge, replace it before balancing. A balanced but damaged tyre can still fail at speed, and the vibration may return as a safety problem rather than a comfort issue.
How should you test the result after the visit?
Drive a short mixed route, then reach a legal motorway speed where traffic allows. The original 50-70 mph shake should be gone; a faint change in steering feel can settle as new weights seat. Recheck wheel nut torque after roughly 50 miles, using the vehicle manufacturer’s figure. If vibration returns at the same speed, ask the technician to check runout and road-force variation, not simply add more weights.
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