The 2014 GMC Trucks Sierra 2500 HD sits in the heavy-duty pickup world where towing, payload, and long-wheelbase stability matter just as much as day-to-day road manners. In this generation, the Sierra 2500 HD blended work-truck capability with upscale trims such as Denali and SLT, so tire choice can vary more than many owners expect. This exact model uses radial tire fitments in four sizes: 245/75R17, 265/70R17, 265/70R18, and 265/60R20. That means the real decision starts with confirming the truck's sub-model and wheel diameter, then narrowing down the right load-oriented tire within that fitment. Sidewall style, rim-width compatibility, and intended use all become important once the correct size is confirmed.
Which Tire Size Is Right for The 2014 GMC Trucks Sierra 2500 HD
The 2014 GMC Trucks Sierra 2500 HD uses four primary tire sizes, and the right one depends on the truck's sub-model and wheel diameter. These are all radial metric sizes, but they span 17-inch, 18-inch, and 20-inch rims, so the first step is confirming the exact wheel setup on the truck before comparing tire choices.
A 265/60R20 tire uses a 265-millimeter section width, a 60-series aspect ratio, radial construction, and a 20-inch rim. On the 2014 GMC Trucks Sierra 2500 HD, this size belongs to trucks equipped with 20-inch wheels, making wheel confirmation especially important before selection. It is the largest rim-diameter fitment used across this model range, and its modern metric format will be familiar to most current truck owners. Choose this size when the truck is already set up for 20-inch wheels and the goal is to stay with the correct primary fitment for that configuration.
A 265/70R18 tire combines a 265-millimeter nominal width with a 70-series profile, radial construction, and an 18-inch rim diameter. This size appears across several 2014 GMC Trucks Sierra 2500 HD sub-models, including trim levels that also carry other wheel options, so it should not be assumed from trim name alone. Its dimensions place it close to other Sierra 2500 HD fitments in overall height, but the wheel diameter is different. It is the right starting point when the truck has 18-inch wheels and the owner wants to match the proper primary size for that setup.
A 245/75R17 tire uses a 245-millimeter section width, a 75-series profile, radial construction, and a 17-inch rim. On the 2014 GMC Trucks Sierra 2500 HD, this is one of the 17-inch fitments and is available in a BFGoodrich All-Terrain T/A KO2 with raised white letter sidewall styling. Its narrower section width gives it a different sizing character than the 265-width options used elsewhere on this truck. This size is worth focusing on when the truck is equipped with 17-inch wheels and the goal is a correct match to that narrower primary fitment.
A 265/70R17 tire pairs a 265-millimeter section width with a 70-series profile, radial construction, and a 17-inch rim diameter. For the 2014 GMC Trucks Sierra 2500 HD, it is the wider of the two 17-inch primary fitments and is available in BFGoodrich All-Terrain T/A KO2 form with raised white letter sidewalls. Product choices in this size also differ in load capacity and weight, which matters on a heavy-duty truck used for hauling or towing. It is the size to evaluate when the truck has 17-inch wheels and needs the broader 265-width fitment rather than the narrower 245-width option.
Tire fitment on the 2014 GMC Trucks Sierra 2500 HD varies by sub-model and wheel package rather than following one universal size across the lineup. Checking the exact trim and cab configuration helps narrow the correct wheel diameter first, then the correct tire size within that setup.
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2014 GMC Trucks Sierra 2500 HD Denali
The 2014 GMC Trucks Sierra 2500 HD Denali uses either 265/60R20 or 265/70R18, both in radial construction. That makes wheel-diameter confirmation the key step before choosing a tire, especially on trucks that may have had wheel changes over time.
The 2014 GMC Trucks Sierra 2500 HD SLE Crew Cab carries the widest fitment spread in this model range, with 245/75R17, 265/70R17, 265/70R18, and 265/60R20 all used in radial form. Tire selection starts by confirming the actual wheel size on the truck, then matching the correct load-capable option within that fitment.
The 2014 GMC Trucks Sierra 2500 HD SLE Ext. Cab can use 17-inch, 18-inch, or 20-inch radial tire fitments depending on its wheel setup. Because several sizes apply to this sub-model, the most useful first check is the current rim diameter rather than the trim badge alone.
The 2014 GMC Trucks Sierra 2500 HD SLE Reg. Cab also spans multiple radial sizes, including both 17-inch options plus 18-inch and 20-inch fitments. That range means owners should verify the truck's exact wheels before comparing tires, especially if the truck has seen fleet use or later modifications.
The 2014 GMC Trucks Sierra 2500 HD SLT Crew Cab uses either 265/60R20 or 265/70R18 in radial construction. Tire choice here is more straightforward than on the broader SLE range, but confirming whether the truck is on 18-inch or 20-inch wheels still comes first.
The 2014 GMC Trucks Sierra 2500 HD SLT Ext. Cab shares the same two radial fitments as other SLT and Denali applications: 265/70R18 and 265/60R20. The practical question is not trim level alone, but which wheel diameter the truck is actually wearing today.
The 2014 GMC Trucks Sierra 2500 HD WT Crew Cab uses 245/75R17, 265/70R17, or 265/70R18, all in radial construction. That gives work-truck owners a need to verify both wheel diameter and whether the truck uses the narrower 245-width or wider 265-width 17-inch setup.
The 2014 GMC Trucks Sierra 2500 HD WT Ext. Cab follows the same three-size radial pattern as other WT versions, covering two 17-inch sizes and one 18-inch size. Before choosing a replacement tire, confirm whether the truck remains on its original wheels or has been changed to a different diameter.
The 2014 GMC Trucks Sierra 2500 HD WT Reg. Cab also uses 245/75R17, 265/70R17, or 265/70R18 radial tires depending on wheel configuration. Since two of those choices share a 17-inch rim, checking the full tire size on the sidewall is the safest way to avoid ordering the wrong width and profile.
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 2014 GMC Trucks Sierra 2500 HD Tires for Sale
Current product coverage on this 2014 GMC Trucks Sierra 2500 HD centers on 17-inch fitments from BFGoodrich in the All-Terrain T/A KO2 series. The available choices use raised white letter sidewalls and vary by size, rim-width specification, weight, and load capacity.
These questions focus on the tire sizes used on the 2014 GMC Trucks Sierra 2500 HD, how wheel diameter affects fitment, and what to compare when choosing among available radial truck tires.
Tire Size & Fitment
What tire size fits a 2014 GMC Trucks Sierra 2500 HD?
The 2014 GMC Trucks Sierra 2500 HD uses four primary tire sizes: 245/75R17, 265/70R17, 265/70R18, and 265/60R20. All of them are radial sizes, and the correct one depends on the truck's sub-model and wheel package rather than the model name alone.
The most important step is checking the actual tire size already mounted on the truck and confirming the wheel diameter. Several trims share more than one valid fitment, so replacing by trim badge alone can lead to the wrong tire, especially on trucks that may have had wheel changes or option-package differences.
What size rim does a 2014 GMC Trucks Sierra 2500 HD use?
The 2014 GMC Trucks Sierra 2500 HD uses 17-inch, 18-inch, and 20-inch rim diameters depending on configuration. The 245/75R17 and 265/70R17 sizes use 17-inch rims, 265/70R18 uses an 18-inch rim, and 265/60R20 uses a 20-inch rim.
Rim diameter is the first fitment detail to verify because none of these tire sizes cross over between those wheel sizes. Once the wheel diameter is confirmed, the next check is the full tire size, since two different 17-inch fitments were used and they do not share the same width and profile.
Why does the 2014 GMC Trucks Sierra 2500 HD have more than one tire size?
The Sierra 2500 HD was offered in multiple trims and cab styles, and those configurations used different wheel packages. That is why this truck can appear with four primary tire sizes across the model range, including both 17-inch options as well as 18-inch and 20-inch fitments.
That variation means the right replacement tire depends on the exact setup under the truck today, not just the model year. A WT, SLE, SLT, or Denali may share part of the fitment range, but the safest path is to confirm sub-model, wheel diameter, and the full size stamped on the current tire sidewall.
Choosing the Right Tire
What should I consider when choosing a tire for a 2014 GMC Trucks Sierra 2500 HD?
Start with the correct primary size for the truck, since the 2014 GMC Trucks Sierra 2500 HD uses four different radial fitments across its lineup. Wheel diameter comes first, then the exact tire size, followed by construction details such as load capacity, rim-width compatibility, and the truck's intended use.
A heavy-duty pickup places more importance on matching the tire to how the truck works, whether that means highway driving, mixed use, or more aggressive terrain. It also helps to compare sidewall style, tire weight, and the specific product's load specification so the replacement choice suits both the wheel and the truck's real job.
What sidewall styles are available for 2014 GMC Trucks Sierra 2500 HD tires?
Among the currently available products for this fitment, the visible sidewall style is RWL, which is raised white letter. That sidewall treatment appears on the BFGoodrich All-Terrain T/A KO2 options available in the covered 17-inch Sierra 2500 HD sizes.
Sidewall style matters mostly for appearance, but it can also shape the truck's overall presentation, especially on a heavy-duty pickup that splits time between work and enthusiast use. If keeping a traditional truck look matters, compare the sidewall treatment along with the correct size and load specification instead of treating appearance as a separate decision.
What brands offer tires for the 2014 GMC Trucks Sierra 2500 HD?
The available products for the covered 2014 GMC Trucks Sierra 2500 HD fitments include BFGoodrich. The current selection centers on the All-Terrain T/A KO2 series in 245/75R17 and 265/70R17 radial sizes, both with raised white letter sidewalls.
Brand matters most after the correct size has been narrowed down, because this truck spans multiple wheel diameters and more than one 17-inch fitment. Once the tire size is confirmed, compare the brand's available load specification, rim-width range, and overall tire character to make sure the choice matches the truck's intended work and road use.
Restoration & Appearance
Which tire should I choose for a period-style 2014 GMC Trucks Sierra 2500 HD?
A period-style choice for a 2014 GMC Trucks Sierra 2500 HD starts with keeping the correct factory-era size and wheel diameter already associated with the truck, whether that is a 17-inch, 18-inch, or 20-inch setup. Since this is a modern heavy-duty pickup, the right visual approach usually comes from matching the truck's original sizing character rather than changing construction type.
Appearance should still follow fitment discipline. Confirm the current wheel size, then choose a tire whose profile and sidewall treatment suit the trim level and the truck's intended presentation. If originality matters closely, compare against window-sticker, build-sheet, or marque-specific references before changing width, profile, or wheel diameter.
Does correct tire fitment matter for a 2014 GMC Trucks Sierra 2500 HD restoration?
Correct tire fitment matters because the 2014 GMC Trucks Sierra 2500 HD used several size and wheel combinations across its trims. A truck restored with the wrong rim diameter or the wrong 17-inch size can look visually off and may also drift away from the way that specific configuration was originally presented.
Getting that fitment right helps preserve both stance and function. It is worth confirming whether the truck should wear 245/75R17, 265/70R17, 265/70R18, or 265/60R20 before focusing on brand or tread style. That sequence keeps appearance decisions grounded in the correct basic proportions for the vehicle.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2014 GMC Trucks Sierra 2500 HD?
Yes, modifications can change tire fitment on a 2014 GMC Trucks Sierra 2500 HD. Aftermarket wheels, altered offsets, suspension lifts or lowering, and body or fender changes can all affect whether the original tire size still has proper clearance, even when the size itself is one of the truck's primary fitments.
The practical check is to verify wheel diameter and width first, then inspect steering, suspension, and fender clearance with the truck at ride height and through turning range. A modified Sierra may still use a stock-size tire, but that should be confirmed against the truck's actual wheel and suspension setup before road use.
What should I inspect before driving a 2014 GMC Trucks Sierra 2500 HD on new tires?
Before road use, inspect inflation pressure, lug-nut torque, tread seating, and sidewall condition, and confirm that all four tires match the intended size for the truck's wheel setup. It is also worth checking that the tires clear the suspension, inner fenders, and steering components without rubbing.
A heavy-duty truck benefits from a short follow-up inspection after the first miles, especially if the tires were mounted on wheels that have seen work use or prior changes. Recheck pressure, look for any signs of contact or uneven wear, and make sure the truck tracks normally before putting it into towing, hauling, or longer highway service.
How should tires on a 2014 GMC Trucks Sierra 2500 HD be maintained?
Tires on a 2014 GMC Trucks Sierra 2500 HD should be maintained with regular pressure checks, visual inspections, and routine monitoring for uneven wear, cracking, cuts, bulges, or air loss. Because this is a heavy-duty pickup, tire condition matters not only for normal driving but also for carrying load and handling work-duty use.
Maintenance also includes matching the tire to the wheel it is mounted on and watching for issues caused by long periods of sitting or harsh service. Check the tires before long trips, rotate them as appropriate for the truck's use pattern, and inspect more often if the Sierra operates under heavy cargo, towing, or rough-surface conditions.
