Passenger, 4×4 & van tyres

The core car sizes are 15, 16 and 17 inch, and between them 205/55R16, 195/65R15 and 215/55R17 cover a large share of the cars on UK roads. We hold these popular sizes in depth to support regular replacement work.

Specify against the vehicle’s own placard, not against the tyre that came off. Fitments change through a model’s production life, and a previous owner’s choice is not evidence of what the vehicle takes. Where the placard lists two sizes they are usually a standard and an option — either is correct on its own, and mixing them across an axle is not.

Summer compounds stiffen as temperature falls, and the widely used industry rule of thumb puts the crossover at around 7°C. That is why a premium summer tyre can feel worse in February than a mid-range all-season, which can help guide a discussion about seasonal suitability.

M+S is a marking the manufacturer applies to its own pattern. The three-peak mountain snowflake, 3PMSF, is awarded only after a measured snow traction test, so it is the marking that carries evidence behind it. A tyre can be M+S and not 3PMSF; the reverse is rare.

Great Britain has no seasonal fitment requirement, so the practical UK answer for most drivers is a 3PMSF all-season fitted year round. Once the cost of a second set, storage, and two changeovers a year is counted, a dedicated winter set only pays for a customer who genuinely needs it — high ground, a rural round, or regular winter driving in Europe.

Customers driving abroad are a different conversation. Several European countries impose winter fitment rules by date or by conditions, and the specification they accept is not always the same one. Point them at the rules of the countries they are actually visiting for the season they are travelling in, rather than at UK practice.

UHP fitments are defined by the speed symbol and by construction rather than by section width. V is 240 km/h, W 270 and Y 300, with the index shown in brackets — (Y) — where the tyre is rated above 300 km/h. Fit at or above the vehicle’s requirement; a lower symbol is a specification failure regardless of the speeds normally driven.

Most sizes in this group are XL or reinforced, which means a stronger casing rated for a higher load at a higher maximum inflation pressure than the standard-load version of the same size. An XL tyre run at standard-load pressures is under-inflated for its rating, and the placard pressure assumes the construction the vehicle was homologated with.

Watch the fitting rules. Directional patterns run one way only, asymmetric patterns have an inside and an outside, and staggered fitments — a wider rear than front — cannot be rotated front to rear. On low-profile sizes there is very little sidewall between the rim and the kerb, so pothole and rim damage, not tread wear, is what usually ends the tyre.

Crossovers and SUVs are heavier than the cars they share a platform with, and the load index is where that shows. The same nominal size is often sold in a car rating and a higher SUV rating, and the higher one is not interchangeable downwards. Check the placard index and match or exceed it.

Electrified models push this further. Battery mass raises the kerb weight and the instantaneous torque raises the wear rate, so an EV or hybrid crossover will often specify a reinforced construction and a noise-attenuating build in a size that also exists as an ordinary car tyre. Check the approved construction and load rating for the specific model.

Most of this class never leaves tarmac, so a highway or road-biased pattern is the right recommendation. Discuss road noise and comfort when considering all-terrain options for mainly urban use.

There are three main tread families to match to the customer’s use. Highway terrain gives quiet running and mileage on road. All-terrain trades some of both for an open shoulder and a tougher casing. Mud terrain gives real off-road traction and gives away noise, wear rate and wet braking to get it.

Ask what proportion of the mileage is genuinely off tarmac. Under about a fifth, an all-terrain is a comfort and appearance decision rather than a traction one, and it should be sold as such. Many all-terrain patterns now carry 3PMSF, which makes them a reasonable year-round choice for rural work.

Sizes in this group frequently exist in both a passenger and a commercial construction — 235/75R15 is a common example. The commercial version has a stiffer casing, a higher load rating and a higher inflation pressure, and it is the correct one for a vehicle that tows or carries at plated weight.

The C suffix marks a commercial construction: more plies, a stiffer casing, a higher load rating and a considerably higher inflation pressure than a passenger tyre of the same section. A passenger-construction tyre fitted to a loaded 3.5 tonne van is under-specified even if the size reads the same.

Vans run close to plated weight most days and their tyres usually come off damaged rather than worn out. Front-wheel-drive panel vans can wear their front tyres faster because those tyres handle steering, drive and braking loads. Use the fleet’s wear records to plan replacement stock.

The load index on a C tyre is written as a pair — for example 115/113R. The first figure applies in single fitment, the second in dual, and the dual figure is lower because tyres in a pair never share load evenly. Chassis cabs, Lutons and tippers with twin rear wheels are rated on the second number. Our axle load calculator turns a plated axle weight into the minimum index in a few seconds.

Double-cab pickups are plated as goods vehicles and are usually bought to tow, so they are specified on load and not on tread pattern. The rear axle carries very different weights loaded and empty, and the placard normally gives two pressures to match. Setting both axles to the unladen figure and leaving it there is the most common reason a pickup wears its rear shoulders out.

Many pickup fitments are commercial-construction sizes rather than passenger ones. Substituting a passenger-rated tyre of the same nominal size loses load capacity and sidewall stiffness, which shows up first as vague towing behaviour and then as heat damage.

For a vehicle doing site access, farm tracks and a motorway commute, an all-terrain with 3PMSF is an option to consider. Mud-terrain patterns suit more demanding off-road use.

Trailer and caravan tyres can age before the tread wears out. The tyre stands loaded and stationary for months, ultraviolet and ozone attack the sidewall, the casing takes a set, and the tread is still legal when the tyre is finished. Include age, sidewall condition and tread depth in inspections, and read the four-digit week and year code moulded into the sidewall. Check the tyre’s condition and follow the tyre manufacturer’s replacement guidance.

Specify commercial construction. A caravan or plant trailer sits at close to its plated axle weight all the time, with limited suspension travel on many light trailers, so the C-rated sizes with their higher load index and inflation pressure are the correct fitment.

Speed rating matters even though the towing limit is well below it. A tyre run continuously near its rating in hot weather at high load builds heat faster than the same tyre run with margin, and a trailer tyre gets no cooling airflow behind a caravan. Check the pressure cold before every long tow — regular pressure checks are a key part of trailer maintenance.