2020 GMC Trucks Tire Fitment Guide

2020 GMC Trucks vehicles use 23 radial tire sizes across eight model lines. Acadia uses 235/55R20, 255/65R17, 245/65R17, and 235/65R18; Canyon uses 255/65R17, 265/65R17, 265/70R16, 255/55R20, and 265/60R18; Sierra 1500 uses 265/65R18, 275/60R20, 275/65R18, 255/70R17, 265/70R17, and 275/50R22. Sierra 2500 HD uses 275/65R20, 275/70R18, 245/75R17, and 265/70R17; Sierra 3500 HD uses 235/80R17, 275/65R20, and 275/70R18; Terrain uses 235/50R19, 225/65R17, and 225/60R18; Yukon and Yukon XL use 275/55R20, 285/45R22, and 265/65R18.

The practical takeaway is that year and make alone are not enough for 2020 GMC Trucks fitment. Wheel diameter ranges from 16 to 22 inches across the lineup, and several sizes are shared only by certain related models. Start by identifying the exact model, then confirm the wheel diameter already on the vehicle, and only then narrow the correct tire size.

On a 2020 GMC Trucks tire, 255/65R17 is a metric radial size. The 255 is the nominal section width in millimeters, 65 is the aspect ratio, the R means radial construction, and 17 is the wheel diameter in inches. On 2020 GMC Trucks applications, that size appears on the Acadia and Canyon.

That code matters because a 255/65R17 tire is built around a 17-inch wheel and has a different overall profile than a 255/55R20 or 265/70R16, even though those sizes may sound similar at a glance. If your 2020 GMC Trucks vehicle has 17-inch wheels and the placard or existing tire confirms 255/65R17, you are in the right size family before comparing brand, tread style, or load details.

No, 2020 GMC Trucks models do not use the same tire size. The lineup includes compact and midsize crossovers, midsize pickups, light-duty full-size pickups, heavy-duty pickups, and full-size SUVs, so tire sizing changes substantially by model and wheel package. Some overlap exists, such as 265/65R18 on Sierra 1500, Yukon, and Yukon XL, or 275/65R20 on Sierra 2500 HD and Sierra 3500 HD, but many sizes are unique to a single model.

That means fitment research for 2020 GMC Trucks should begin with model identification, not just the GMC badge and model year. If you are unsure whether you have a shared size or a model-specific one, check the tire sidewall and wheel diameter already on the vehicle. That will usually narrow the correct path faster than comparing the full year-make range.

2020 GMC Trucks sizes with current product coverage use two sidewall styles: RWL and RBL. RWL appears on 255/65R17, 245/65R17, 265/70R16, 275/65R18, 265/70R17, 275/70R18, and 245/75R17, while RBL appears on 275/65R20, 235/80R17, and 225/65R17. All of those products are radial BFGoodrich all-terrain offerings, so the sidewall distinction is mainly visual rather than a change in construction type.

For a 2020 GMC Trucks owner, that means sidewall choice comes down to the specific size and application rather than a broad year-wide preference. White-letter styling often suits trucks and SUVs with a more rugged or period-enthusiast look, while black-letter sidewalls keep a more understated appearance. Once the correct size is confirmed, sidewall style can be part of the final selection if more than one visual presentation is available in that size.

BFGoodrich currently covers the 2020 GMC Trucks sizes that have product availability here. Those products include 255/65R17, 245/65R17, 265/70R16, 275/65R18, 265/70R17, 275/65R20, 275/70R18, 245/75R17, 235/80R17, and 225/65R17, all in radial construction. The series represented is the All-Terrain T/A KO2.

That concentration around one brand and one all-terrain family is useful if your 2020 GMC Trucks vehicle is a Canyon or Sierra and you want a truck-oriented tread character. It also means buyers of crossover and SUV applications should confirm whether the exact size they need is one of the covered sizes before comparing any cosmetic or rating differences. The size itself remains the first filter, with brand choice following after that.

For 2020 GMC Trucks applications that use 265/70R17, both available BFGoodrich tires share radial construction, the KO2 series, an RWL sidewall, a 17-inch rim diameter, an S speed rating, and a rim width range of 7.0 to 9.0 inches. The key difference is load capacity and inflation: one carries 2,470 lbs at 50 psi and weighs 45.7 pounds, while the other carries 3,195 lbs at 80 psi and weighs 53.5 pounds.

That difference matters most when separating lighter-duty use from heavier-duty use within the 2020 GMC Trucks family. A Sierra 1500 and a Sierra 2500 HD may both use 265/70R17, but they do not place the same demands on the tire. Match the tire to the vehicle's required load capacity, not just the nominal size code, and confirm the wheel is within the tire's approved rim width range.

Several 2020 GMC Trucks sizes have clear rim width guidance. 255/65R17 and 265/70R17 fit 7.0 to 9.0-inch rims, 245/65R17 fits 7.0 to 8.0, 265/70R16 fits 7.0 to 8.5, 275/65R18 and 275/65R20 fit 7.5 to 9.5, 275/70R18 fits 7.0 to 9.0, 245/75R17 fits 6.5 to 7.5, 235/80R17 fits 6.0 to 7.5, and 225/65R17 fits 6.0 to 8.0.

Rim width matters because the same 17-inch diameter does not automatically mean every 17-inch GMC wheel suits every 17-inch tire. Width affects section shape, sidewall support, and how accurately the tire works within its intended dimensions. Before mounting a replacement on a 2020 GMC Trucks wheel, verify both wheel diameter and wheel width so the tire falls inside the approved range for that exact size.

The 2020 GMC Trucks products covered here are radial truck and SUV tires, and none carry a tube-type marking in the size information. That means these applications are treated as tubeless in normal use. Sizes such as 255/65R17, 265/70R16, 275/65R20, and 235/80R17 follow modern tubeless radial practice rather than vintage tube-type construction.

For most 2020 GMC Trucks owners, the practical concern is not tube fitment but wheel condition, bead sealing, and valve stem service. If the wheel is damaged, corroded, or previously repaired, a tire installer should inspect it before mounting a new tire. On late-model GMC vehicles, replacing worn valve stems during tire service is a sensible step, especially if the vehicle sees towing, off-pavement use, or long highway trips.

No, original 2020 GMC Trucks wheels cannot be treated as universal across all tire sizes. The year-make range includes 16-, 17-, 18-, 19-, 20-, and 22-inch tire applications, so a tire must match the wheel diameter exactly. Even when two sizes share the same diameter, the approved rim width can still differ by size.

A 17-inch wheel from one 2020 GMC Trucks model may work only with certain 17-inch sizes, not every 17-inch option in the lineup. That is especially important when owners compare Sierra, Canyon, Terrain, or Acadia sizes simply because the rim diameter number matches. Reuse the original wheel only after confirming both the exact tire size and the wheel width for the vehicle in front of you.

A 2020 GMC Trucks vehicle should be stored on clean, properly inflated tires in a cool, dry area away from direct sunlight, electric motors, battery chargers, welders, and other ozone sources. If the vehicle will sit for extended periods, move it occasionally so one section of the tread does not carry the full load continuously. Keeping the tires off oil, solvents, and standing moisture also helps preserve the rubber.

Because 2020 GMC Trucks applications here are all radial, they generally tolerate storage better than older bias-ply designs, but long static periods still age the tire and can encourage flat-spotting. If a Yukon, Sierra, or Canyon will be parked for months, inflation checks and periodic movement are worthwhile. For very long storage, some owners use stands to reduce load on the tires while still supporting the suspension correctly.

On a 2020 GMC Trucks vehicle, tire life should be judged by age and condition as much as tread depth. A good rule is to begin closer inspection once tires are around five to seven years old and to treat the ten-year mark as a serious replacement point, even on low-mileage collector or secondary-use vehicles. The DOT date code on the sidewall tells you when each tire was made.

That matters because many 2020 GMC Trucks vehicles, especially SUVs and extra vehicles in enthusiast households, may not wear out tires quickly by mileage alone. Rubber hardens and internal materials age even when tread still looks usable. Check the date code, inspect for sidewall cracking or irregular wear, and avoid assuming that low annual mileage means the tires are automatically safe indefinitely.

Tires on a 2020 GMC Trucks vehicle should be checked before every drive and inspected more carefully before any longer highway trip, towing trip, or off-pavement outing. Look for cracking, cuts, bulges, punctures, irregular wear, and pressure loss, and compare all four tires plus the spare if one is carried. Uneven wear can also point to alignment, suspension, or inflation issues rather than a tire defect alone.

Regular inspection is especially important on 2020 GMC Trucks because the lineup includes everything from crossover applications to heavy-duty truck sizes with very different load demands. A quick walkaround can catch damage that would be easy to miss on a daily-driven vehicle. If a tire repeatedly loses pressure or shows shoulder wear, have the wheel, valve stem, and alignment checked before using the vehicle for a longer trip.

Yes, 2020 GMC Trucks tires in these covered sizes are modern radial tires intended for normal road use when they are in sound condition and matched correctly to the vehicle. The speed ratings present here include S, with a 112 mph ceiling, and R, with a 106 mph ceiling. Those ratings are well above ordinary U.S. highway speeds, assuming the tires are properly inflated and the vehicle itself is mechanically fit for road use.

Real-world safety on a 2020 GMC Trucks vehicle depends on more than the tire's letter rating. Load capacity, inflation pressure, suspension condition, braking performance, alignment, and the vehicle's intended use all matter, especially on Sierra HD trucks and loaded SUVs. Choose a tire whose rating and load capacity suit the model and usage, then keep speeds consistent with both the tire specification and the vehicle's overall condition.

Inflation pressure for 2020 GMC Trucks tires should follow the vehicle placard or owner's manual first, with the tire's own maximum pressure and load figure used as a rating reference rather than a blanket inflation target. Examples include 255/65R17 at 2,600 lbs at 65 psi, 265/70R16 at 3,195 lbs at 80 psi, 275/65R20 at 3,750 lbs at 80 psi, and 235/80R17 at 3,085 lbs at 80 psi. Those figures are size-specific and should not be transferred from one GMC size to another.

That distinction is important because a 2020 GMC Trucks crossover, half-ton pickup, and heavy-duty pickup do not use the same pressure strategy even when their size codes look close. The sidewall figure represents the pressure associated with the tire's maximum rated load, not necessarily the vehicle's recommended running pressure. Use the factory recommendation for the vehicle and reevaluate if the tire size, load range, or intended duty changes.

Before taking a 2020 GMC Trucks vehicle on a longer drive, inspect all tires for cracking, cuts, bulges, punctures, uneven tread wear, and proper inflation. Check the spare as well, and look at the valve stems for age or damage. If the vehicle is a Sierra or Yukon that may be carrying passengers, cargo, or towing load, make sure the tire's load capability suits the planned use.

Tires are only one part of a broader pre-trip check on a modern truck or SUV, but they are the easiest place to catch a problem early. A quick inspection should be paired with checks of brakes, fluids, lights, and suspension condition, especially on vehicles that spend long periods parked between uses. For 2020 GMC Trucks applications with heavier-duty tires, also verify that inflation is appropriate for the expected load before leaving.