The 2014 GMC Trucks Sierra 1500 arrived at a time when full-size pickups were expected to balance work capability, everyday comfort, and a more refined appearance than earlier generations. In this model year, the Sierra 1500 covered a wide span of trims, from straightforward work-focused versions to the more upscale Denali. That variety carries directly into tire fitment, with four radial sizes used across 17-inch, 18-inch, and 20-inch wheel setups. The key decision is identifying the exact sub-model and wheel diameter first, then narrowing the choice by tire size, load specification, and the look or use case that best suits the truck.
Which Tire Size Is Right for The 2014 GMC Trucks Sierra 1500
The 2014 GMC Trucks Sierra 1500 uses four primary tire sizes, and the correct one depends on the specific sub-model and wheel diameter. These are all metric radial fitments, but they are spread across 17-inch, 18-inch, and 20-inch rims. Before selecting a tire, the first step is confirming the truck's exact trim and the wheels currently on it, especially if it has been changed from its original setup.
255/70R17 is a metric radial size in which 255 identifies the section width in millimeters, 70 is the aspect ratio, R denotes radial construction, and 17 is the wheel diameter in inches. On the 2014 GMC Trucks Sierra 1500, this size is part of the truck's 17-inch fitment range and suits configurations built around that wheel diameter. Its sizing places it in the mainstream light-truck radial format familiar to modern pickup owners. This size should be chosen only after confirming that the truck's sub-model and current wheels match the 17-inch setup.
265/70R17 follows the same metric radial format, with a 265-millimeter nominal width, a 70-series profile, radial construction, and a 17-inch rim. For the 2014 GMC Trucks Sierra 1500, it is used on certain 17-inch applications and is also the size with visible product choices in BFGoodrich's All-Terrain T/A KO2 line with raised white letter sidewalls. Those options differ in load capacity, inflation specification, and weight, which matters for buyers comparing truck use and wheel compatibility. It is a useful size to evaluate carefully when a Sierra is expected to handle mixed on-road and light off-road duty.
275/55R20 is a metric radial size where 275 represents section width in millimeters, 55 is the aspect ratio, R indicates radial construction, and 20 is the required wheel diameter. On the 2014 GMC Trucks Sierra 1500, this size belongs to the truck's 20-inch fitment group and appears on higher-trim applications. Its lower-profile format gives it a distinctly different wheel-and-tire presentation than the 17-inch and 18-inch options. It should be evaluated with close attention to actual wheel diameter and the truck's trim-specific setup before treating it as the correct choice.
265/65R18 uses the modern metric radial system, pairing a 265-millimeter section width with a 65-series profile on an 18-inch wheel. For the 2014 GMC Trucks Sierra 1500, this size sits between the 17-inch and 20-inch fitments and is tied to trims that use 18-inch wheels. That makes it an important size for owners whose trucks fall between basic and premium wheel packages rather than at either extreme. Selecting it starts with confirming that the truck still carries the proper 18-inch wheel setup and has not been switched to a different factory-size combination.
Tire fitment on the 2014 GMC Trucks Sierra 1500 varies by sub-model, so trim identification matters before choosing a size. Some versions share more than one factory-size path, while others are tied to a single wheel and tire combination.
1
2014 GMC Trucks Sierra 1500 Base
The 2014 GMC Trucks Sierra 1500 Base uses 17-inch radial tire fitments and can be equipped with either of two primary sizes. That makes wheel confirmation especially important before replacing tires, since the correct choice depends on the exact setup currently on the truck.
The 2014 GMC Trucks Sierra 1500 Denali follows a more focused fitment path with its 20-inch radial setup. Tire selection is more straightforward here, but confirming that the truck still has its matching 20-inch wheels remains the key first step.
The 2014 GMC Trucks Sierra 1500 SLE has the widest fitment spread, covering 17-inch, 18-inch, and 20-inch radial tire setups. On an SLE, the practical decision starts with identifying the wheel diameter on the truck now rather than assuming one size applies across all SLE configurations.
The 2014 GMC Trucks Sierra 1500 SLT uses either an 18-inch or 20-inch radial fitment depending on the truck's wheel package. Tire replacement is straightforward once wheel diameter is confirmed, since that immediately narrows the correct size path.
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 1500 Tires for Sale
Available product choices for the 2014 GMC Trucks Sierra 1500 are centered on 265/70R17, where BFGoodrich offers All-Terrain T/A KO2 tires with radial construction, raised white letter sidewalls, and differing load and rim-width specifications for buyers comparing truck use requirements.
These FAQs focus on the tire sizes used on the 2014 GMC Trucks Sierra 1500, how trim and wheel diameter affect fitment, and what to review when choosing replacement tires for road use, appearance, and everyday truck duty.
Tire Size & Fitment
What tire size fits a 2014 GMC Trucks Sierra 1500?
The 2014 GMC Trucks Sierra 1500 uses four primary tire sizes: 255/70R17, 265/70R17, 265/65R18, and 275/55R20. All of them are radial sizes, and the correct one depends on the truck's exact sub-model and wheel package rather than the Sierra 1500 name alone.
The most important step is matching the tire size to the actual wheels on the truck now. A Base, SLE, SLT, or Denali can follow different fitment paths, and an 18-inch or 20-inch setup changes the correct tire immediately. Checking the placard, current tire sidewall, and wheel diameter helps avoid choosing the right size for the wrong Sierra configuration.
What size rim does a 2014 GMC Trucks Sierra 1500 use?
A 2014 GMC Trucks Sierra 1500 can use 17-inch, 18-inch, or 20-inch rims depending on the sub-model and tire size. The 255/70R17 and 265/70R17 fitments use 17-inch rims, 265/65R18 uses an 18-inch rim, and 275/55R20 uses a 20-inch rim.
Rim diameter needs to be confirmed before anything else because these sizes are not interchangeable across different wheel diameters. A 20-inch tire cannot be mounted on an 18-inch wheel, and a 17-inch fitment should not be assumed just because the truck is a Sierra 1500. If the truck has aftermarket wheels, verify the actual wheel size and width before ordering replacement tires.
Why does the 2014 GMC Trucks Sierra 1500 have more than one tire size?
The 2014 GMC Trucks Sierra 1500 spans several trims, and those trims were offered with different wheel and tire packages. Base models use 17-inch fitments, Denali uses a 20-inch fitment, and SLE and SLT can fall into more than one size depending on how the truck is equipped.
That means tire selection starts with trim and wheel confirmation, not with a generic year-make-model search alone. Two Sierra 1500 trucks from the same year can need different sizes if one has 17-inch wheels and the other has 20-inch wheels. Looking at the truck's current tire size and wheel diameter is the quickest way to stay on the correct fitment path.
Choosing the Right Tire
What should I consider when choosing a tire for a 2014 GMC Trucks Sierra 1500?
Start with the correct size for the truck's exact trim and wheel diameter, since the 2014 GMC Trucks Sierra 1500 uses several radial fitments. Once size is confirmed, compare construction details, load capacity, intended use, and whether the tire's overall character matches how the truck is driven.
A Sierra used mainly on pavement may call for a different tire style than one that sees gravel roads, jobsite use, or occasional trail work. The wheel width range can also matter, especially on 265/70R17 products. Choosing carefully means balancing the truck's actual setup with practical needs such as load handling, appearance, and where the truck spends most of its time.
What sidewall styles are available for 2014 GMC Trucks Sierra 1500 tires?
Among the available products for the 2014 GMC Trucks Sierra 1500, 265/70R17 is offered with RWL sidewalls. RWL means raised white letters, a sidewall treatment that gives the truck a more traditional off-road and sport-truck presentation than a plain blackwall.
Sidewall style does not change the basic tire size, but it can noticeably affect how the truck looks once mounted. Raised white letters may suit an all-terrain appearance, while some owners may prefer a more understated sidewall on a daily-driven pickup. The best approach is to choose the correct size first, then decide whether the visible sidewall treatment matches the truck's intended look.
What brands offer tires for the 2014 GMC Trucks Sierra 1500?
Current product choices for the 2014 GMC Trucks Sierra 1500 include BFGoodrich in 265/70R17. That size is available in the All-Terrain T/A KO2 series, giving Sierra owners a recognizable all-terrain option within one of the truck's primary fitment sizes.
Brand selection should still be secondary to correct fitment, since the Sierra 1500 uses several sizes across different trims and wheel diameters. After size is verified, compare the product's load rating, rim-width compatibility, and sidewall style to the truck's actual use. A tire brand matters most when its available specifications line up with how the particular Sierra is equipped and driven.
Restoration & Appearance
Which tire should I choose for a period-style 2014 GMC Trucks Sierra 1500?
A period-style choice for a 2014 GMC Trucks Sierra 1500 starts with keeping the truck in its correct factory-size range for the exact trim and wheel diameter. For owners using 265/70R17, an all-terrain radial with raised white letters creates a look that feels appropriate to many early-2010s full-size pickups.
Appearance should follow fitment, not the other way around. A truck wearing the wrong rim diameter or an incorrect size can lose the stance and proportion that make it look right. When preserving a stock-style presentation matters, compare the truck's current wheels and trim level first, then choose a tire whose sidewall treatment and profile suit that original overall visual balance.
Does correct tire fitment matter for a 2014 GMC Trucks Sierra 1500 restoration?
Correct tire fitment matters because the 2014 GMC Trucks Sierra 1500 was offered with multiple wheel and tire combinations across its trims. Using the proper size helps preserve the truck's intended stance, wheel-to-tire proportion, and overall appearance in a way that a mismatched size often does not.
That is especially important on a newer collector or preservation-minded truck where the visual details still define how authentic the finished vehicle feels. Tire size should be verified against the exact trim and wheel diameter before focusing on brand or sidewall presentation. Once fitment is right, appearance choices become much easier to make without distorting the truck's original character.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2014 GMC Trucks Sierra 1500?
Yes. Wheel changes, suspension alterations, leveling kits, lowering, and body modifications can all affect tire fitment on a 2014 GMC Trucks Sierra 1500. Even when the truck started with one of the original sizes, a different wheel width, offset, or ride height can change clearance around the fenders, suspension, and steering components.
That is why modified trucks should be checked by actual wheel diameter and physical clearance, not by original trim alone. A Sierra with aftermarket wheels may no longer follow its original size path exactly. Before replacing tires, inspect the current setup for rubbing marks, measure wheel size, and confirm there is adequate clearance at full steering lock and suspension travel.
What should I inspect before driving a 2014 GMC Trucks Sierra 1500 on new tires?
Before driving, check that the new tires match the correct size for the truck's wheel diameter, are inflated properly for the application, and clear the suspension and bodywork. It is also smart to inspect the wheels for damage and confirm lug hardware, valve stems, and mounting condition are all in good order.
A short initial drive can reveal vibration, pull, or rubbing that may not be obvious while the truck is parked. After that first road test, recheck air pressure and look at the sidewalls for any sign of contact. On a Sierra 1500 that has seen wheel swaps or suspension changes, this verification step is especially important before longer highway use.
How should tires on a 2014 GMC Trucks Sierra 1500 be maintained?
Tires on a 2014 GMC Trucks Sierra 1500 should be maintained with regular pressure checks, visual inspection, and attention to tread wear. Watch for cracking, cuts, bulges, irregular wear patterns, and slow air loss, especially on a truck that tows, carries cargo, or spends time on rougher surfaces.
Good maintenance also includes keeping the tires matched to the correct wheel size and replacing any tire that shows age-related deterioration or damage. Trucks that sit for long periods still need inspection because low use does not stop rubber from aging. Clean storage, proper inflation, and periodic evaluation of condition help keep the Sierra ready for safe day-to-day road use.
