Wind Deflectors (0)

Wind deflectors for trucks and HGVs, including cab roof deflectors and side deflectors to reduce aerodynamic drag and improve fuel efficiency. Wind deflectors are a practical addition on any combination vehicle where there is a significant height difference between the tractor cab and the trailer. Parts are available for the main HGV makes. UK delivery available. Same-day collection from our branches in Redditch, Worcester, Birmingham, and Evesham.

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Truck wind deflectors: how they work and what to consider

Wind deflectors work by redirecting airflow over and around the gap between the cab roof and trailer front. On a standard curtainsider or box trailer combination, the square face of the trailer creates significant aerodynamic drag without a deflector in place. A well-fitted roof deflector guides the airflow across the trailer front, which reduces the pressure differential and cuts the drag coefficient.

The key is fit. A deflector that is set too low or angled incorrectly can create turbulence rather than reducing it. The deflector height should be adjusted so the top of the trailer sits within the smoothed airflow. Side deflectors fill the gap between the cab and trailer at the sides, reducing drag and road spray.

Frequently Asked Questions

Will a wind deflector make a significant difference to fuel consumption?

On long-haul operations with a consistent combination, a correctly fitted roof deflector typically produces a measurable fuel saving. Urban-only operations with frequent trailer changes see less benefit than long-haul fixed combinations.

Do wind deflectors affect DVSA annual test compliance?

Deflectors must be securely mounted and must not obscure lighting or create a hazard. A loose or damaged deflector that could detach at speed is a roadworthiness concern. Check fixings at service intervals.

How do I know which wind deflector fits my truck cab?

Check the cab model and year of manufacture. Wind deflectors are cab-specific and shaped to fit the roof profile of a particular model range. If you are unsure which deflector fits, call us with the cab make and model.

Can wind deflectors be fitted to any trailer combination?

Roof deflectors are adjustable in height to accommodate different trailer heights. If the operation uses trailers of varying heights, the deflector setting needs adjusting when the combination changes for maximum benefit.