Wheel Torquing and Re-Torquing
Why it matters, what to do, and how to stay compliant
Wheel loss from commercial vehicles is rare — but when it happens, the consequences are severe. DVSA research is clear: there is no mystery. In many cases, wheel detachment can be traced back to incorrect or careless torque practices.
This article explains:
- What wheel torquing and re-torquing mean in practice
- Why wheel fixings can loosen after refitting
- What drivers, operators, and transport managers need to do
- How to stay compliant and manage risk effectively
What is wheel torquing?
Torquing is the process of tightening wheel nuts/bolts to a specified force, measured in Newton metres (Nm), using a calibrated torque wrench.
When carried out correctly, torquing:
- Helps clamp the wheel securely to the hub
- Allows the wheel fixing (stud or bolt) to stretch slightly, acting like a very stiff spring
- Reduces the risk of movement, wear, and progressive loosening
Too little torque can allow movement to occur.
Excessive torque can damage threads, studs, wheels, or seating faces.
Wheel fixings must always be tightened in accordance with the vehicle manufacturer’s specified torque values and procedures.
Why re-torquing is essential
Even where wheel nuts have been tightened correctly, early relaxation of tension can occur following wheel refitting.
DVSA research has shown that:
- Relaxation can occur even while a vehicle is stationary
- It results from settlement of mating surfaces, not vibration
- It affects all wheel fixings, regardless of whether threads are left-hand or right-hand
As this relaxation occurs, the clamping force reduces and the risk of wheel looseness increases.
When must re-torque checks be carried out?
Following road wheel removal and refitting, wheel fixing should be tightened:
- After the vehicle has been standing for 30 minutes,
OR - After the vehicle has travelled between 40 km and 80 km (25–50 miles)
Unless otherwise specified, this applies to all commercial vehicles.
Where manufacturer instructions differ from general guidance, the manufacturer’s procedure must always take precedence.
Recording re-torque checks
Re-torque checks form part of effective maintenance control and must not be overlooked.
- All re-torque checks must be recorded
- Records must be retained and available for inspection
- Records should clearly identify:
- Vehicle registration or fleet number
- Date, time and mileage
- Person carrying out the check
- Confirmation that the correct torque was applied
In the event of a roadside inspection or investigation, the absence of records may be taken as evidence of inadequate maintenance management. All vehicle maintenance records, including wheel torque documentation, must be kept for at least 15 months.
Tightening wheel nuts
- Always use a calibrated torque wrench
- Torquing should be carried out by competent and trained personnel only
- Do not rely on:
- Impact guns for final tightening
- Long bars or estimation
- Tighten wheel fixings:
- In the sequence specified by the vehicle manufacturer
- If no sequence is specified, by gradually tightening approximately diametrically opposed nuts in turn
Where drivers are required to carry out wheel checks:
- They must receive appropriate training
- They must understand what to report and when to escalate concerns
⚠️ Wheel fixings that are repeatedly loose must not simply be re-tightened.
The underlying cause must be investigated and any damage assessed.
Inspecting wheels and fixings
As part of routine maintenance and inspection:
- Check wheels for cracks, particularly around fixing holes
- Inspect studs, nuts, and washers for wear, damage, or distortion
- Check seating faces for raised lips or deformation caused by over-tightening
- Renew components where there is any doubt
Research has identified that low-quality replacement parts can contribute to wheel fixing failures. Where possible:
- Use manufacturer-approved parts
- Prefer parts that conform to BS AU 50 standards
Wheel types and compatibility
Most heavy commercial vehicles now use spigot-mounted wheels, located centrally on the hub and secured using flat-faced nuts with captive, rotating washers.
Other systems include:
- Straight-sided cone seat fixings
- Spherical seat fixings
These fixing systems are not interchangeable.
The incorrect combination of wheel and fixing type can prevent correct seating and lead to loosening.
Composite or dual-purpose wheels are not recommended.
The bottom line
Wheel maintenance may be demanding and time-consuming, but it remains essential.
Correct torquing, timely re-torquing, trained personnel, and accurate records demonstrate effective maintenance control and significantly reduce the risk of wheel detachment.
Look after your wheels, and there is a far greater chance they will stay exactly where they should be:
On your vehicle.
Sources:
- Guide to maintaining roadworthiness: commercial goods and passenger carrying vehicles https://www.gov.uk/government/publications/guide-to-maintaining-roadworthiness/guide-to-maintaining-roadworthiness-commercial-goods-and-passenger-carrying-vehicles
- Careless Torque Costs Lives https://www.gov.uk/government/publications/careless-torque-costs-lives