2018 GMC Trucks Tire Fitment Guide

2018 GMC Trucks vehicles use 20 sizes across eight model lines: 235/55R20, 245/65R17, and 235/65R18 for Acadia; 255/65R17, 265/65R17, 265/70R16, 255/55R20, and 265/60R18 for Canyon; 255/70R17, 265/70R17, 275/55R20, 285/45R22, and 265/65R18 for Sierra 1500; 245/75R17, 265/70R18, and 265/60R20 for Sierra 2500 HD; 235/80R17 and 265/70R18 for Sierra 3500 HD; 235/50R19, 225/65R17, and 225/60R18 for Terrain; and 275/55R20, 285/45R22, and 265/65R18 for both Yukon and Yukon XL.

Rim diameters span 16 through 22 inches, so fitment starts with the exact model and the wheel already on the vehicle. Where product fitment details appear, rim width ranges include 6.0 to 8.0 inches for 225/65R17, 7.0 to 8.0 for 245/65R17, 7.0 to 9.0 for 255/65R17, 7.0 to 8.5 for 265/70R16, 7.0 to 9.0 for 265/70R17, 6.5 to 7.5 for 245/75R17, and 6.0 to 7.5 for 235/80R17. Confirm the wheel diameter first, then compare the exact size on the current sidewall before moving to a product choice.

On a 2018 GMC Trucks tire, 245/65R17 is a metric radial code. The 245 is the nominal section width in millimeters, 65 is the aspect ratio, R means radial construction, and 17 is the wheel diameter in inches. In this application, that size appears on the Acadia and is offered with an S speed rating, which carries a 112 mph ceiling.

Reading the code correctly helps separate width, profile, and rim diameter so you do not accidentally substitute a tire that only looks similar at a glance. A 245/65R17 is not interchangeable with a 245/75R17 or a 255/65R17 without checking the vehicle’s intended fitment and wheel. For a 2018 GMC Trucks Acadia, the cleanest starting point is the exact sidewall size already on the vehicle, followed by a check of wheel diameter and intended use.

No. 2018 GMC Trucks uses a model-specific spread of sizes, with only a few shared fitments. Sierra 1500, Yukon, and Yukon XL share 275/55R20, 285/45R22, and 265/65R18, while Sierra 2500 HD and Sierra 3500 HD share 265/70R18. Most other sizes belong to a single model line such as Acadia, Canyon, Terrain, or a particular Sierra series.

That means year and make alone are not enough for accurate selection. A Canyon can wear a 16-, 17-, 18-, or 20-inch tire depending on configuration, and the Acadia and Terrain each have their own crossover-oriented fitment groups. If you are not certain which GMC model you have, verify the model badge and compare the existing tire size on the sidewall before narrowing down brands or tread styles.

2018 GMC Trucks tires in the covered product range use two sidewall styles: RWL and RBL. RWL appears on 245/65R17, 255/65R17, 265/70R16, 265/70R17, and 245/75R17, while RBL appears on 235/80R17 and 225/65R17. Those markings change the appearance of the tire even when the size is the same basic fitment family.

Sidewall style matters most when you want the truck or SUV to keep a specific visual character. Raised white letters tend to suit off-road or sport-truck looks, while black sidewalls are usually more understated and easier to blend into stock-style presentations. If appearance is part of your decision, confirm both the exact size and the sidewall treatment before settling on a product, especially if you want the tires to match front to rear.

Within the covered sizes that have product availability here, BFGoodrich supplies 245/65R17, 255/65R17, 265/70R16, 265/70R17, 245/75R17, 235/80R17, and 225/65R17. Those products are part of the All-Terrain T/A KO2 family and all use radial construction. The remaining 2018 GMC Trucks fitment sizes do not appear here with a second brand to compare against.

For a buyer, that means the larger choice on this page often comes down to exact size, wheel diameter, sidewall appearance, and load requirement rather than brand switching within the same size. If your GMC is one of the models using a supported KO2 size, pay close attention to whether the tire is aimed at crossover, light-truck, or heavy-duty use. Matching the tire’s character to the vehicle’s actual job is usually more important than chasing a brand change for its own sake.

The two BFGoodrich 265/70R17 options for 2018 GMC Trucks share the same size, radial construction, RWL sidewall, and S speed rating with a 112 mph ceiling, but they differ in load capacity and inflation pressure. One version carries 2,470 pounds at 50 psi and weighs 45.7 pounds, while the other carries 3,195 pounds at 80 psi and weighs 53.5 pounds. Both fit a 17-inch rim with an approved rim width range of 7.0 to 9.0 inches.

That difference matters most on a Sierra 1500, where owners may use the truck very differently. A lighter-duty setup can be more appropriate for everyday use, while the heavier-load version may suit drivers who prioritize payload support or a more robust light-truck specification. The best move is to confirm how your truck is equipped and how it is used before choosing between two tires that share the same basic sidewall size but not the same carrying capability.

Rim width requirements vary by size on 2018 GMC Trucks. Covered examples include 245/65R17 at 7.0 to 8.0 inches, 255/65R17 at 7.0 to 9.0 inches, 265/70R16 at 7.0 to 8.5 inches, 265/70R17 at 7.0 to 9.0 inches, 245/75R17 at 6.5 to 7.5 inches, 235/80R17 at 6.0 to 7.5 inches, and 225/65R17 at 6.0 to 8.0 inches. Each of those also uses the rim diameter built into the size code.

Rim width affects how the tire sits on the wheel and should always be checked alongside the tire size itself. Even when two tires share the same 17-inch rim diameter, they may have different approved width windows. If your GMC has aftermarket wheels or a wheel package from another trim level, measure or confirm the wheel specification before finalizing the tire choice.

The covered 2018 GMC Trucks products are radial metric sizes and none is marked as a tube-type tire. That points to tubeless construction for the products represented here, and there is no sign of mixed tube-type and tubeless variation within these supported sizes. This fits normal modern-wheel practice for 2018 crossovers, pickups, and SUVs.

Even so, tubeless does not remove the need to inspect the wheel carefully. A bent bead seat, corrosion around the sealing area, or a damaged valve stem can cause air loss even with the correct tire. If your GMC uses older replacement wheels, off-road wheels, or previously repaired rims, inspect the wheel condition before mounting a new tire and replace valve stems as part of the installation.

A 2018 GMC Trucks vehicle should be stored on clean, properly inflated tires away from direct sunlight, standing moisture, and ozone-producing equipment such as electric motors, welders, and some battery chargers. Modern radial tires usually tolerate storage better than older bias-ply designs, but they still age from heat, UV exposure, and long periods of static load. Rolling the vehicle occasionally can help avoid long-term stress in one contact patch area.

If the vehicle will sit for an extended season, keep it on a dry surface and maintain inflation pressure rather than letting the tires sag. Owners who store a Yukon, Sierra, or other heavier GMC model for months at a time may also consider moving it periodically or supporting the vehicle in a way that reduces prolonged loading. Storage habits matter just as much as mileage on collector-driven or second-use vehicles.

Tire life on a 2018 GMC Trucks vehicle is usually better judged by age and condition than by mileage alone, especially if the vehicle is driven infrequently. A good rule is to begin more serious age-based evaluation around five to seven years and to treat the 10-year point as replacement territory regardless of remaining tread. The DOT date code on the sidewall is the clearest way to determine tire age.

That matters because a low-mileage GMC can still wear old tires that look acceptable at first glance. Heat cycles, sun exposure, underinflation, and long storage periods all harden rubber over time. If you recently bought a used Acadia, Canyon, Sierra, Terrain, or Yukon, check the date code before trusting the tires simply because the tread depth seems generous.

Tires on a 2018 GMC Trucks vehicle should be inspected before every drive and again before any longer highway outing. Look for pressure loss, sidewall cracking, punctures, bulges, uneven wear, and tread damage, and pay attention to how the vehicle feels during the first few miles. On larger SUVs and pickups, irregular wear can also hint at alignment or suspension issues that are easier to correct early.

Frequent inspection is especially worthwhile if the vehicle alternates between daily use and periods of sitting. A quick walkaround can catch a low tire, a cut sidewall, or a damaged valve stem before it becomes a roadside problem. Make the spare part of the same routine, since an aging spare on a 2018 GMC Trucks vehicle may be the oldest tire on the entire vehicle.

Yes, the supported 2018 GMC Trucks products are highway-capable radial tires, and the covered examples all carry an S speed rating, which corresponds to a 112 mph ceiling. That is well above ordinary U.S. interstate cruising speeds for crossover, SUV, and pickup use. In normal driving, the vehicle’s load, inflation, suspension condition, and overall mechanical state are usually more important than the raw speed rating alone.

Safety still depends on using the correct size and the right load capability for the model. A Sierra HD that tows or hauls regularly places very different demands on its tires than a Terrain commuter. Before a highway trip, confirm tire age, pressure, tread condition, and whether your GMC’s actual use matches the carrying ability of the tire you are considering.

Inflation pressure on 2018 GMC Trucks tires depends on the exact size and product. Covered examples include 245/65R17 at 2,405 pounds @ 65 psi, 255/65R17 at 2,600 pounds @ 65 psi, 265/70R16 at 3,195 pounds @ 80 psi, 265/70R17 at either 2,470 pounds @ 50 psi or 3,195 pounds @ 80 psi, 245/75R17 at 3,195 pounds @ 80 psi, 235/80R17 at 3,085 pounds @ 80 psi, and 225/65R17 at 2,150 pounds @ 65 psi.

Those figures are the tire’s rated load-and-pressure values, not a blanket recommendation to run every GMC at the maximum sidewall pressure. Start with the factory placard or owner’s manual for the vehicle’s intended operating pressure, then make sure the tire you choose is suitable for that application. Never transfer a pressure figure from one size to another just because both tires fit 17-inch wheels.

Before a longer drive in a 2018 GMC Trucks vehicle, inspect all tires for cuts, cracking, punctures, sidewall bulges, uneven wear, and proper inflation. Check the spare as well, since a neglected spare can turn a minor tire problem into a trip-ending issue. On trucks and SUVs, it is also wise to look for signs of overloading or towing stress if the vehicle has recently been used for work or recreation.

Tires are only one part of the pre-trip picture, but they are the part in direct contact with the road. Pair the tire inspection with a general check of brakes, steering feel, and suspension condition, especially on Sierra and Yukon models that may carry more weight. A few minutes of inspection before departure is far easier than sorting out heat, vibration, or air-loss problems miles from home.