The 2008 GMC Trucks Yukon XL 1500 belongs to the full-size SUV era when long-wheelbase utility, family hauling, and light-duty towing all had to live in one vehicle. Its extended body and trim-dependent wheel packages make tire selection more specific than it first appears, because this Yukon XL 1500 uses three different radial sizes: 265/70R17, 265/65R18, and 275/55R20. That means the first step is matching the tire to the exact sub-model and wheel diameter rather than choosing by appearance alone. Once that is confirmed, the decision shifts to load capability, sidewall treatment, and how the vehicle is actually used on the road.
Which Tire Size Is Right for The 2008 GMC Trucks Yukon XL 1500
The 2008 GMC Trucks Yukon XL 1500 uses three primary tire sizes, and they vary by sub-model and wheel diameter. Before selecting a tire, confirm whether the vehicle is an SLE, SLT, SLT w/Z71 Pkg., or Denali, then verify whether it is on 17-inch, 18-inch, or 20-inch wheels. That matters more here than construction choice, because all primary fitments are radial.
265/65R18 is a metric radial size where 265 identifies the section width in millimeters, 65 is the aspect ratio, R indicates radial construction, and 18 is the wheel diameter in inches. On the 2008 GMC Trucks Yukon XL 1500, this size suits configurations that use an 18-inch wheel and keeps the fitment in the vehicle's primary radial construction. It is a useful size to confirm carefully on trim-specific applications, especially where wheel packages affect fitment more than appearance details. Matching the actual wheel diameter on the vehicle should come before comparing any tire options.
275/55R20 is a metric radial size that uses a 275-millimeter section width, a 55-series profile, radial construction, and a 20-inch rim. For the 2008 GMC Trucks Yukon XL 1500, this size belongs to configurations equipped with 20-inch wheels, so it should be treated as a wheel-package-specific fitment rather than a universal choice across the model line. Its role is tied directly to the correct rim diameter and sub-model setup. Buyers considering this size should verify the current wheel package first, especially on vehicles that may have changed wheels over time.
265/70R17 is a metric radial size with a 265-millimeter section width, a 70-series aspect ratio, radial construction, and a 17-inch wheel diameter. On the 2008 GMC Trucks Yukon XL 1500, this size applies to 17-inch-wheel configurations and is the size with available BFGoodrich All-Terrain T/A KO2 choices in raised white letter form. Those options also differ in load capacity and product weight, which matters for buyers balancing everyday driving with heavier-duty SUV or truck use. Confirming wheel size and intended use helps narrow the right version within this fitment.
Tire fitment on the 2008 GMC Trucks Yukon XL 1500 varies by sub-model, and some trims use more than one primary size depending on wheel package. Identifying the exact trim is the key first step, because the difference between 17-inch, 18-inch, and 20-inch fitment determines which tire size belongs on the vehicle.
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2008 GMC Trucks Yukon XL 1500 Denali
The Denali uses either 265/65R18 or 275/55R20, both in radial construction, so wheel diameter is the deciding fitment detail. Tire selection starts with confirming whether the vehicle is on 18-inch or 20-inch wheels, then comparing options within the correct size for road use and load needs.
The SLE uses 265/70R17 radial tires, making its fitment more straightforward than the trims with multiple wheel-package sizes. Once the 17-inch wheel setup is confirmed, the decision becomes choosing the right tire version for the vehicle's use, including load range and sidewall presentation.
The SLT can use either 265/70R17 or 275/55R20, so this trim requires a close check of the actual wheel diameter before any tire is selected. That makes wheel confirmation more important than trim name alone, especially on vehicles that may have had wheel changes during their service life.
The SLT w/Z71 Pkg. uses 265/65R18 in radial construction, placing it with the 18-inch fitment rather than the 17-inch or 20-inch alternatives seen elsewhere in the lineup. Tire choice here centers on staying within the proper 18-inch size and checking overall compatibility with the vehicle's actual wheel setup.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 2008 GMC Trucks Yukon XL 1500 Tires for Sale
Available product choice is centered on 265/70R17, with BFGoodrich All-Terrain T/A KO2 options in raised white letter form. The main comparison points are load capacity, product weight, and 17-inch rim-width compatibility within the same tire series.
Owners of a 2008 GMC Trucks Yukon XL 1500 usually need to sort out trim-specific tire size, wheel diameter, and how product differences affect use. These FAQs focus on fitment, radial tire choices, appearance details, and the checks worth making before putting the vehicle back on the road.
Tire Size & Fitment
What tire size fits a 2008 GMC Trucks Yukon XL 1500?
The 2008 GMC Trucks Yukon XL 1500 uses three primary tire sizes: 265/70R17, 265/65R18, and 275/55R20. Which one belongs on the vehicle depends on the exact sub-model and wheel package, with all primary fitments using radial construction.
The most important step is confirming the trim and the actual wheel diameter on the vehicle. An SLE uses 265/70R17, the SLT w/Z71 Pkg. uses 265/65R18, and Denali or SLT models may use more than one size depending on wheel setup, so the tire should always be matched to the wheel already on the truck.
What size rim does a 2008 GMC Trucks Yukon XL 1500 use?
A 2008 GMC Trucks Yukon XL 1500 may use 17-inch, 18-inch, or 20-inch rims, depending on the sub-model and wheel package. Those rim diameters correspond to the three primary tire sizes: 265/70R17, 265/65R18, and 275/55R20.
That means rim diameter has to be verified before shopping by tire size alone. A vehicle that has had wheel changes over time can easily wear a different diameter than expected for the trim, so reading the current tire sidewall and measuring the wheel setup is the safest way to avoid choosing the wrong fitment.
Do all 2008 GMC Trucks Yukon XL 1500 sub-models use the same tire size?
No, the 2008 GMC Trucks Yukon XL 1500 does not use one tire size across every sub-model. SLE uses 265/70R17, SLT w/Z71 Pkg. uses 265/65R18, and both Denali and SLT can use more than one size depending on wheel configuration.
That variation matters because the tire size is tied directly to wheel diameter, not just trim name. A buyer should identify the exact sub-model first, then confirm whether the vehicle is on 17-inch, 18-inch, or 20-inch wheels before comparing tires, especially on SUVs that may have received aftermarket wheels or take-off factory sets.
Choosing the Right Tire
What should I consider when choosing a 265/70R17 tire for a 2008 GMC Trucks Yukon XL 1500?
Start with the basics: 265/70R17 must match a Yukon XL 1500 that actually uses the 17-inch fitment, such as the SLE or some SLT configurations. Available choices in this size include BFGoodrich All-Terrain T/A KO2 tires, with differences in load capacity, inflation specification, and product weight.
Selection depends on how the vehicle is used. A Yukon XL that sees light everyday driving may not need the same tire version as one carrying heavier loads or used in rougher conditions, so compare the tire's load figure, the wheel's 17-inch fit, and whether the raised white letter sidewall suits the look you want.
What sidewall styles are available for 2008 GMC Trucks Yukon XL 1500 tires?
Among the currently available products for this fitment, 265/70R17 options are offered with an RWL sidewall, meaning raised white letters. That gives the Yukon XL 1500 a more assertive truck-style presentation than a plain black sidewall.
Sidewall appearance is worth considering alongside fitment and use, especially on a full-size SUV where the tire makes a strong visual contribution. The right choice still begins with the correct tire size and wheel diameter, then moves to whether an RWL look matches the vehicle's intended character and how closely it should reflect a traditional SUV appearance.
What brands offer tires for the 2008 GMC Trucks Yukon XL 1500?
Current product coverage for the 2008 GMC Trucks Yukon XL 1500 includes BFGoodrich in 265/70R17. The available offering in that size is from the All-Terrain T/A KO2 series, with more than one specification under the same overall tire family.
Brand choice is only part of the decision. The more useful comparison is whether the tire matches the correct trim-specific size, whether the load specification suits how the Yukon XL is used, and whether the 17-inch wheel setup and sidewall style align with the vehicle's present configuration and intended appearance.
Restoration & Appearance
Which tire should I choose for a period-style 2008 GMC Trucks Yukon XL 1500?
A period-style choice starts with the exact size the vehicle uses now: 265/70R17, 265/65R18, or 275/55R20, depending on trim and wheel package. Since this is a 2008 full-size SUV with radial primary fitments, staying with the correct modern metric radial format preserves the vehicle's intended overall tire presentation.
Appearance should be balanced against real fitment details. A Yukon XL that is meant to reflect its original-era look benefits from the proper wheel diameter and tire proportions first, while sidewall style and tread character come after that, especially if the SUV has had later wheel changes that alter its stance.
How does tire construction affect the appearance of a restored 2008 GMC Trucks Yukon XL 1500?
Construction is straightforward on this vehicle because the primary fitments are radial across all listed sizes. That keeps the visual character in line with what buyers expect from a 2008 full-size SUV, where modern metric radial sizing and larger wheel packages are part of the overall look.
The bigger appearance difference usually comes from choosing the correct wheel diameter and sidewall profile for the trim. A 17-inch setup, an 18-inch setup, and a 20-inch setup each give the Yukon XL a different stance, so a restoration-minded owner should confirm the intended wheel package before focusing on smaller styling details.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2008 GMC Trucks Yukon XL 1500?
Yes, modifications can change tire fitment on a 2008 GMC Trucks Yukon XL 1500 even when the original trim used one of the correct factory-era sizes. Aftermarket wheels, altered offsets, suspension lifts or drops, and body changes can all affect how a 265/70R17, 265/65R18, or 275/55R20 tire sits in the wheel opening.
The practical check is to verify the actual wheel diameter and width on the vehicle, then inspect steering and fender clearance through the full range of motion. A modified Yukon XL should never be matched by trim name alone, because the current setup may differ meaningfully from the original wheel and tire package.
What should I inspect before driving a 2008 GMC Trucks Yukon XL 1500 on new tires?
Begin with the basics: confirm the tire size matches the vehicle's wheel diameter, check inflation pressure, and inspect the wheels for damage or improper width. It also helps to look over suspension and steering components so the new tires are not being asked to compensate for worn parts.
A careful walkaround should include checking for clearance at the fenders and inner wheel wells, especially if the SUV has different wheels than it left the showroom with. After the tires are mounted, monitor air retention and look for any signs of rubbing or uneven wear during the first several drives.
How often should tires on a 2008 GMC Trucks Yukon XL 1500 be inspected?
Tires on a 2008 GMC Trucks Yukon XL 1500 should be inspected regularly, not just at service intervals. Pressure, tread wear, cuts, bulges, cracking, and any sign of slow air loss are worth checking often, particularly on a larger SUV that may carry passengers, cargo, or tow intermittently.
A habit of inspecting the tires before longer trips is especially useful on vehicles that do not see daily mileage. Owners should also keep an eye on wear patterns that suggest alignment, suspension, or wheel issues, since those problems can shorten tire life even when the vehicle is wearing the correct size.
