2026 INEOS Trucks Tire Fitment Guide

2026 INEOS Trucks vehicles use two tire sizes: 255/70R18 and 265/70R17, and both apply to the Grenadier. The 255/70R18 fits an 18-inch wheel, while the 265/70R17 fits a 17-inch wheel. For the 265/70R17, the supported rim width range is 7.0 to 9.0 inches. The two sizes do not share the same rim diameter, so they are not interchangeable without the corresponding wheel.

That means year and make alone are not enough to choose a tire for a 2026 INEOS Trucks Grenadier. Start by checking the size on the sidewall of the tires already on the vehicle or confirm the wheel diameter directly. Once the wheel size is verified, you can narrow the search to the correct tire size and then compare load version, sidewall appearance, and intended use within that fitment.

On a 2026 INEOS Trucks tire, 255/70R18 is a metric radial size code. The 255 indicates a nominal section width of 255 millimeters, the 70 is the aspect ratio, the R identifies radial construction, and the 18 is the wheel diameter in inches. That combination points to a Grenadier fitment built around an 18-inch wheel rather than the 17-inch alternative used elsewhere in the same model line.

For a buyer, the important takeaway is that the final number matters just as much as the width. A 255/70R18 cannot be mounted on a 17-inch wheel, even if the overall look seems close to another Grenadier size. If your goal is a straightforward replacement, confirm that the wheel itself is 18 inches before comparing tire options within this size.

On a 2026 INEOS Trucks tire, 265/70R17 is also a metric radial size code. The 265 indicates a nominal section width of 265 millimeters, the 70 is the aspect ratio, the R denotes radial construction, and the 17 means the tire mounts on a 17-inch wheel. For the Grenadier, this size is paired with 17-inch wheels and appears in versions with different load capacities under the same overall size designation.

That difference matters because two tires can share the same basic size while serving different duty expectations. On a 2026 INEOS Trucks Grenadier, checking the full sidewall marking helps you match not only the 17-inch rim diameter but also the load version that suits how the vehicle is equipped and used. It is a good habit to compare the full size and service description before replacing one tire or a full set.

The right choice for a 2026 INEOS Trucks Grenadier is determined by wheel diameter first, not by a bias-ply-versus-radial decision, because both sizes are radial. The 255/70R18 belongs on 18-inch wheels, while the 265/70R17 belongs on 17-inch wheels. Those are separate fitments, so the correct size is the one that matches the wheels already on your Grenadier.

If you are replacing tires on the existing wheels, stay with the wheel diameter already fitted unless you are intentionally changing wheels as part of a broader setup change. If you are buying a used Grenadier or sorting out a second wheel set, check the sidewall on the current tires and measure the wheel if needed. That approach avoids ordering a tire that is correct in type but wrong in rim diameter.

For 2026 INEOS Trucks fitments shown here, the 265/70R17 is available with an RWL sidewall, meaning raised white letters. That gives the tire a more traditional off-road look than a plain blackwall sidewall. The 255/70R18 remains a separate Grenadier fitment, so sidewall appearance should be confirmed within that size when comparing products for an 18-inch-wheel vehicle.

Sidewall style is mainly a visual decision once the correct size and load version are settled. Many Grenadier owners like RWL styling because it suits the truck's purposeful, heritage-inspired character, but appearance should come after confirming wheel diameter and service description. If you want the truck to keep a factory-clean or expedition-ready look, compare the sidewall treatment along with the rest of the tire's practical specs.

BFGoodrich covers the 265/70R17 fitment for 2026 INEOS Trucks Grenadier applications, including two All-Terrain T/A KO2 versions with different load capacities. That brand has long-standing credibility in the off-road market, so it is a familiar name for buyers choosing tires for a modern utility-focused 4x4. Brand choice should still be tied to the exact size and service description rather than the name alone.

For a 2026 INEOS Trucks owner, the practical step is to match brand availability to the wheel size already on the vehicle. A Grenadier on 17-inch wheels can then be compared within the BFGoodrich offerings by load version and intended use. If your truck runs 18-inch wheels, begin with that size first, then compare the products built around the 255/70R18 fitment rather than trying to cross-shop the 17-inch option.

For 2026 INEOS Trucks Grenadier applications using 265/70R17 tires, the supported rim width range is 7.0 to 9.0 inches on a 17-inch wheel. That range gives some flexibility while keeping the tire within its intended mounting window. The 255/70R18 is a separate 18-inch fitment, so wheel width should be confirmed against the specific tire chosen in that size.

Rim width matters because it affects how the tire sits on the wheel and can influence tread shape, sidewall posture, and overall fitment confidence. Even when the wheel diameter is correct, it is still worth checking the actual wheel width before making a final choice. If your Grenadier has aftermarket wheels, confirm both dimensions rather than assuming the current setup matches the replacement tire automatically.

The 2026 INEOS Trucks fitments here are radial light-truck and SUV sizes rather than vintage tube-type designs, and the available 265/70R17 products do not carry tube-type markings in the size description. That strongly points to a tubeless application on appropriate modern wheels. Tube use should follow the specific wheel design and the tire's own sidewall marking rather than habit or assumption.

For most Grenadier owners, the practical move is to treat these as modern radial fitments and verify compatibility with the actual wheel before installation. If the vehicle is using factory-style modern wheels, tubeless setup is the normal expectation. If a wheel has been changed or modified, confirm valve condition, bead-seat condition, and the tire's sidewall details before deciding whether any special setup is needed.

A 2026 INEOS Trucks Grenadier should be stored with the tires clean, properly inflated, and protected from sunlight, ozone sources, and standing moisture. Keep the vehicle away from electric motors, welders, battery chargers, and other equipment that can generate ozone near the sidewalls. If the truck will sit for an extended period, moving it occasionally or using stands to reduce sustained contact load can help prevent flat-spotting.

That matters even on a modern radial tire, because age and environment affect rubber as much as mileage does on collector and low-use vehicles. A Grenadier that spends months parked between trips can still suffer sidewall aging if it is stored poorly. Good storage habits preserve ride quality and help you catch pressure loss or sidewall changes before they turn into a problem on the next drive.

Tires on a 2026 INEOS Trucks Grenadier should be judged by age and condition, not just tread wear. A sensible rule is to begin evaluating them closely once they are in the five-to-seven-year range and to consider replacement as they approach about ten years, even if the tread still looks usable. The DOT date code on the sidewall tells you when each tire was manufactured.

That approach fits vehicles that may see irregular mileage, seasonal use, or long storage intervals. A Grenadier used for occasional trips, trail duty, or overland travel can carry plenty of tread while still aging out. Regular age checks, combined with inspection for cracking, impact damage, and uneven wear, give a much better picture of service life than mileage alone.

Tires on a 2026 INEOS Trucks Grenadier should be inspected before every drive and again before any longer highway or trail outing. Check inflation, tread depth, visible cuts, punctures, bulges, and any cracking around the sidewall or shoulder area. On a vehicle that may carry cargo or travel off pavement, a quick walkaround inspection is especially worthwhile because impact damage can appear before a slow leak becomes obvious.

Frequent inspection is one of the easiest ways to avoid an inconvenience turning into a trip-ending problem. Pay extra attention after rocky trail use, curb contact, or long periods of storage, and inspect the spare as well as the road tires. Catching pressure loss, irregular wear, or sidewall injury early helps you address setup issues before they affect handling, ride quality, or reliability.

2026 INEOS Trucks Grenadier tires in the 265/70R17 fitment are available with an S speed rating, which corresponds to a maximum speed capability of 112 mph under the tire's rating standard. That is well above normal U.S. highway speeds, so the tire's speed rating is unlikely to be the limiting factor in everyday road use. Real-world safety depends just as much on inflation, load carried, condition, alignment, and the overall mechanical state of the vehicle.

For practical use, a properly matched and properly maintained tire can handle routine highway driving in a Grenadier without drama. The more important question is whether the tire's load version suits how the truck is equipped and how you plan to use it. Confirm the full size and service description, keep pressures correct, and inspect the tires before long trips or demanding off-road travel.

For 2026 INEOS Trucks Grenadier applications using 265/70R17, one available tire carries 2,470 pounds at 50 psi and another carries 3,195 pounds at 80 psi. Those figures are maximum load and pressure ratings for the tire itself, not a blanket inflation recommendation for every Grenadier. The correct operating pressure should be checked against the vehicle's factory guidance and the specific tire's own rating information.

That distinction is important because tire pressure is vehicle-specific, load-specific, and sometimes front-to-rear specific. Do not transfer a pressure figure from one load version or one tire size to another just because the sidewall dimensions look similar. If your Grenadier has different equipment, added cargo weight, or an aftermarket wheel and tire package, confirm pressures carefully before a longer drive.

Before a longer drive in a 2026 INEOS Trucks Grenadier, inspect every tire for cracking, cuts, punctures, bulges, uneven wear, and correct inflation, and make sure the spare is in equally usable condition. Check the valve stems, look for any signs of bead damage after off-road use, and confirm that the tire size and load version match the vehicle's setup. A tire that appears fine at a glance can still have age, impact, or pressure issues that show up once the miles add up.

Tire inspection should be part of a broader pre-trip check on a modern 4x4, especially one expected to cover highway miles and rough terrain in the same outing. Verify torque on the wheels, confirm alignment and suspension behavior feel normal, and address any vibration before departure. Taking a few extra minutes with the tires often reveals the first signs of a problem while it is still easy to correct.