SMMT Guide on Trailer Maintenance > Trailer Tyres
| Tyres Braking Systems Breakaway Cable |
Secondary Couplings Lighting Systems |
Trailer Tyres
Tyres have to comply with exactly the same regulations for condition and tread depth as those for cars and light vans. Replacement tyres must be capable of sustained running at 60mph with the trailer at its MAM. However, it is recommended that tyres of the same size and load / speed rating as the originals are fitted: they do not have to be the same make. The load / speed rating is marked on the side of the tyre along with the size.
A load / speed index table is included in the Trailer section..
Note that any additional maximum load markings on the tyre in pounds (Ibs) should be ignored as they do not apply to the UK or Europe. Radial and cross ply tyres must not be mixed on the same axle.
It is recommended, though not a legal requirement, that they are not mixed between axles. If they are mixed, the radials should be on the rear.
Pressures must be maintained as recommended by the trailer manufacturer. Low tyre pressures are the most common cause of tyre failure and variations in pressure from tyre to tyre can adversely affect the handling of the trailer.
Spare wheels are not a legal requirement but if fitted the tyre has to comply with the regulations.
