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Tow Bar buying guide — what to know before you buy

A tow bar (towbar) is the structural assembly bolted to a vehicle's chassis that provides the coupling point for towing a trailer, caravan, or horsebox, and for fitting cycle carriers and rear cargo platforms. In the UK, towbars fitted to vehicles first used on or after 1 August 1998 must carry EC type-approval certification. Tow bars are available in three main configurations: fixed, detachable-neck, and retractable — each offering a different balance between permanent availability and aesthetics when not in towing use.

Types of tow bar

A fixed tow bar is permanently attached and always visible behind the vehicle. It is the simplest and lowest-cost option, suitable for frequent towers. A detachable-neck tow bar allows the tow ball and neck assembly to be removed when not in use, leaving only a small flange against the bumper. A retractable tow bar uses a powered or manual mechanism to swing the tow ball under the bumper when not in use, preserving the clean rear appearance of the vehicle.

Fixed tow bar: lowest cost, always ready, tow ball permanently visible
Detachable neck: tow ball and neck removable — cleaner look when not towing
Retractable / deployable: swings under the bumper — suits vehicles where appearance matters
EC type-approval marking is required on vehicles registered from 1 August 1998

Towing capacity and nose weight

The tow bar's approval is limited by the vehicle's own towing capacity as stated in the owner's handbook. The nose weight (the downward force the trailer's coupling exerts on the tow ball) must not exceed the vehicle's permitted nose weight or the tow bar's rated nose weight, whichever is lower. Overloading the tow bar or exceeding nose weight limits affects handling and stresses the vehicle's rear subframe.

Check the vehicle's maximum towing capacity in the handbook before ordering a trailer
Nose weight limit is typically 75–100 kg for passenger cars
Never exceed the lower of the vehicle's permitted nose weight or the tow bar's rated nose weight
Overloading causes dangerous trailer snaking and can damage the rear structure

Tow bar wiring and electrics

A tow bar requires an electrical connection to supply the trailer's lights. In the UK, the 13-pin ISO 11446 socket is standard on caravans and modern trailers; older trailers may use a 7-pin socket. Vehicles with trailer-stability control may require a dedicated towbar-wiring module that communicates with the vehicle's CAN bus rather than a simple bypass relay loom. Fitting an incorrect loom can trigger fault codes on modern vehicles.

Frequently Asked Questions

Does a tow bar need to be professionally fitted?

The tow bar itself can be fitted by a competent DIY mechanic following the manufacturer's installation instructions, provided the fitting kit matches the vehicle. However, the wiring on modern CAN bus vehicles often requires a specialist to avoid triggering fault codes. For type-approved towbars, professional fitting and an installation certificate is recommended.

Will fitting a tow bar affect my car's warranty?

Fitting a type-approved towbar should not void the vehicle warranty, provided it is installed correctly and does not damage any existing components. Using an unapproved towbar or incorrectly wired loom that causes electrical faults could potentially affect warranty claims related to those systems. Keep the installation receipt and certificate.

Can I use a bike rack on a tow bar without a caravan or trailer?

Yes. Platform bike carriers, hanging bike racks, and cargo platforms are all designed to mount onto a standard tow ball or towbar receiver. Check that the carrier's rated nose weight does not exceed the vehicle's permitted nose weight, and ensure the carrier does not obstruct rear lights — if it does, a trailer board is required by law.