The 1990 GMC Trucks S15 sits in the compact truck era when small pickups had become everyday work vehicles, commuter trucks, and light custom platforms all at once. Its appeal today comes from that useful, square-shouldered practicality and the wide range of ways owners preserve or personalize them. Tire fitment centers on three radial sizes: 195/75R14, 205/75R14, and 215/65R15. That gives the S15 a meaningful choice between 14-inch and 15-inch wheel setups, along with sidewall treatments ranging from narrow and wide whitewalls to redlines and raised white letter performance-style options. The key is matching the tire to the truck’s actual wheel setup and the appearance or road use you want.
Which Tire Size Is Right for The 1990 GMC Trucks S15
The 1990 GMC Trucks S15 uses three primary tire sizes, and the first step is confirming which wheel diameter is on the truck. Two sizes, 195/75R14 and 205/75R14, fit 14-inch rims, while 215/65R15 fits a 15-inch rim. Because all covered sub-models can use these sizes, the real decision is matching the tire to the actual wheel setup and then choosing the sidewall style, series, and overall look that best suits the truck.
195/75R14 is a metric radial size in which 195 refers to nominal section width in millimeters, 75 is the aspect ratio, R identifies radial construction, and 14 is the rim diameter in inches. On the 1990 GMC Trucks S15, it is one of the 14-inch fitments and keeps the tire choice within a modern radial format. Available options include Coker Classic, Tornel, Maxxis, and Travelstar, with narrow whitewall and wide whitewall treatments across several series. It is a useful size to evaluate when the truck retains a 14-inch wheel and the goal is a traditional driver-oriented presentation.
205/75R14 uses the same metric radial naming convention, with a 205-millimeter nominal width, a 75-series profile, radial construction, and a 14-inch rim diameter. For the 1990 GMC Trucks S15, this is another 14-inch fitment and offers the broadest range of visible style choices within the covered sizes. It is available from American Classic, Coker Classic, Maxxis, BFGoodrich, Tornel, and Travelstar in narrow whitewall, wide whitewall, and redline forms across multiple series. This size deserves a close look when a 14-inch S15 owner wants the widest appearance and brand selection without changing wheel diameter.
215/65R15 is a metric radial size that combines a 215-millimeter nominal width with a 65-series profile on a 15-inch rim. On the 1990 GMC Trucks S15, it serves as the 15-inch fitment and shifts the decision toward confirming that the truck is actually running a 15-inch wheel. Product choices include Goodyear, Cooper, and BFGoodrich, with sidewall treatments such as OWL, RWL, redline, and wide whitewall across Eagle GT, Cobra Radial G/T, Silvertown Radial, and Radial T/A lines. It is worth considering when the truck already has 15-inch wheels and the owner wants either a sportier or more customized visual character.
Fitment is straightforward across the covered 1990 GMC Trucks S15 sub-models because Base, High Sierra, and Sierra Classic each use the same three radial size choices. The main thing to verify is not trim level, but whether the truck is on a 14-inch or 15-inch wheel before selecting a tire.
1
1990 GMC Trucks S15 Base
The 1990 GMC Trucks S15 Base shares the same 195/75R14, 205/75R14, and 215/65R15 radial fitment choices used across the covered S15 lineup. Tire selection comes down to confirming the wheel diameter on the truck and then choosing the sidewall style, series, and overall look that matches its intended use.
The 1990 GMC Trucks S15 High Sierra uses the same group of radial tire sizes as the other covered sub-models, so trim level does not create a separate fitment path here. The practical decision is matching the tire to the truck’s actual 14-inch or 15-inch wheel setup and choosing the appearance that suits the truck.
The 1990 GMC Trucks S15 Sierra Classic follows the same tire-size pattern as the rest of the covered S15 sub-models, with both 14-inch and 15-inch radial options in play. That makes wheel confirmation the important first step, followed by selecting between whitewall, redline, or raised white letter-style presentations.
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 1990 GMC Trucks S15 Tires for Sale
Available 1990 GMC Trucks S15 tires span 195/75R14, 205/75R14, and 215/65R15 radials from brands including Coker Classic, American Classic, BFGoodrich, Goodyear, Cooper, Maxxis, Tornel, and Travelstar. The main comparison points are wheel diameter, tire series, and sidewall presentation, with choices ranging from narrow and wide whitewalls to redline, OWL, and RWL styles.
Showing 6 of 21
Radial Tires
Coker Classic Star Series | 2.25 Inch Whitewall | 195/75R14
Common 1990 GMC Trucks S15 tire questions usually center on which of the three sizes applies, whether the truck is on a 14-inch or 15-inch wheel, and how to choose among whitewall, redline, or raised white letter radial options.
Tire Size & Fitment
What tire size fits a 1990 GMC Trucks S15?
A 1990 GMC Trucks S15 uses one of three radial tire sizes: 195/75R14, 205/75R14, or 215/65R15. The two 14-inch sizes are 195/75R14 and 205/75R14, while 215/65R15 is the 15-inch fitment. Base, High Sierra, and Sierra Classic all share these same size choices.
The practical step is confirming the wheel diameter actually installed on the truck before choosing a tire. A surviving S15 may still have its original-style wheels, but aftermarket wheels or previous owner changes can alter what belongs on it now. Once wheel size is confirmed, compare sidewall style, brand, and tire series within the correct primary size.
What size rim does a 1990 GMC Trucks S15 use?
The 1990 GMC Trucks S15 uses either a 14-inch or 15-inch rim, depending on which of its primary tire sizes is on the truck. Both 195/75R14 and 205/75R14 fit 14-inch rims, while 215/65R15 fits a 15-inch rim. All three covered sub-models share that same basic fitment pattern.
Wheel diameter needs to be verified before ordering tires because the tire size must match the rim exactly. It is also worth checking wheel width, especially on a truck that has been updated or customized over the years. Looking at the current tire size, measuring the wheel, and comparing that setup to the tire’s own rim-width guidance helps avoid a mismatch.
Do all 1990 GMC Trucks S15 sub-models use the same tire size?
Base, High Sierra, and Sierra Classic all use the same three radial size options: 195/75R14, 205/75R14, and 215/65R15. In other words, trim level does not create separate tire sizes within the covered 1990 GMC Trucks S15 range. The variation comes from the wheel setup rather than the sub-model name itself.
That makes selection easier, but it does not eliminate the need to inspect the truck. A 14-inch wheel requires either 195/75R14 or 205/75R14, and a 15-inch wheel requires 215/65R15. Checking the current wheel and tire combination is especially important on older compact trucks that may have had wheel swaps, suspension changes, or cosmetic updates during their lives.
Choosing the Right Tire
What should I consider when choosing a 1990 GMC Trucks S15 tire?
Start with the correct primary size for the truck’s wheel diameter: 195/75R14, 205/75R14, or 215/65R15. From there, the decision shifts to sidewall style, tire series, brand, and how the truck is used. A more traditional look may point toward whitewall choices, while some 15-inch options lean toward a sport-truck or custom presentation.
It also helps to compare wheel-width guidance and load figures where those details are available, especially if the truck is driven regularly or carries light cargo. The best match is the one that keeps the correct size relationship to the wheel while also fitting the visual character of the S15. Appearance, road use, and wheel setup should all agree before a tire is selected.
What sidewall styles are available for 1990 GMC Trucks S15 tires?
The 1990 GMC Trucks S15 has a broad mix of sidewall styles across its three tire sizes. Available choices include narrow whitewall, wide whitewall, redline, OWL, and RWL treatments. That range gives the S15 owner room to move from a clean stock-leaning appearance to a more custom or sport-oriented look without leaving the correct primary size family.
Sidewall style should be chosen after size and wheel diameter are settled, not before. A whitewall can suit a restoration-minded truck or a custom cruiser feel, while redline and raised white letter styles often create a stronger visual statement. The key is keeping the appearance decision inside the proper size for the wheel rather than forcing a style from the wrong diameter.
What brands offer tires for the 1990 GMC Trucks S15?
Tires for the 1990 GMC Trucks S15 are available from Coker Classic, American Classic, BFGoodrich, Goodyear, Cooper, Maxxis, Tornel, and Travelstar. Brand availability depends on the size, with the widest spread appearing in 205/75R14. Some brands focus on traditional whitewall presentation, while others bring redline, OWL, or RWL styling into the mix.
Brand choice should be part of a broader comparison rather than the only deciding factor. It helps to look at which series each brand offers in the correct size and whether the tire’s sidewall treatment fits the truck’s intended style. Once the right diameter and size are confirmed, comparing brand, series, and rim-width compatibility becomes far more useful than comparing brand names alone.
Restoration & Appearance
Which tire should I choose for a period-style 1990 GMC Trucks S15?
A period-style 1990 GMC Trucks S15 usually starts with the correct wheel diameter and one of its proper radial sizes: 195/75R14, 205/75R14, or 215/65R15. From there, the tire’s visual character matters. Whitewall options can give the truck a more traditional presentation, while redline or raised white letter styles shift it toward a more personalized late-1980s to early-1990s look.
The right choice depends on how the truck is being represented. A restoration-oriented build may call for a restrained sidewall treatment, while a custom street truck may lean into stronger visual contrast. Exact originality questions should be checked against vehicle-specific historical references, but staying with the proper size and wheel diameter is the foundation of a convincing period-style appearance.
How does tire construction affect the appearance of a restored 1990 GMC Trucks S15?
Construction is simple on the 1990 GMC Trucks S15 because its primary fitments are all radial. That means appearance differences come less from bias-ply versus radial shape and more from the sidewall treatment, brand presentation, and the tire series chosen within the correct size. On this truck, whitewall, redline, OWL, and RWL options create the most noticeable visual change.
For a restored or carefully presented S15, the wrong sidewall style can change the truck’s character as quickly as the wrong wheel. A wide whitewall gives a much different impression than a raised white letter performance-style tire, even when both are the correct size. Choosing with the truck’s finished look in mind keeps the tire from feeling visually out of step with the rest of the build.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1990 GMC Trucks S15?
Yes, modifications can affect tire fitment on a 1990 GMC Trucks S15 even when the tire size itself is correct. Wheel swaps, suspension lowering, altered ride height, or changes in wheel width can all influence how a 195/75R14, 205/75R14, or 215/65R15 tire sits on the truck. Steering clearance and fender clearance are part of that fitment picture.
A truck that has been customized should be checked as an individual setup rather than treated like a stock example automatically. Measuring the actual wheel diameter and width, looking at current clearances, and inspecting for rubbing marks can prevent a poor tire choice. This matters most when moving between 14-inch and 15-inch wheel setups or when stance changes have already been made.
What should I inspect before driving a 1990 GMC Trucks S15 on new tires?
Before driving a 1990 GMC Trucks S15 on new tires, inspect the wheels for correct diameter, width, and condition, then verify that the tires are seated properly and inflated appropriately for their application. It also makes sense to check for suspension wear, loose steering components, and any evidence that the old tires were contacting fenders or inner wheel housings.
A short visual check can prevent bigger problems once the truck is back on the road. Look for cracking, cuts, bulges, uneven tread wear on the previous set, and slow air loss that might point to wheel or valve issues. After installation, turning the steering from lock to lock and checking clearance under load helps confirm that the new tires suit the truck’s present setup.
How should 1990 GMC Trucks S15 tires be maintained on a collector truck?
Tires on a collector-owned 1990 GMC Trucks S15 should be inspected regularly for air pressure, tread condition, sidewall cracking, cuts, bulges, and signs of age-related deterioration. Even a lightly used truck can develop tire problems from long storage periods rather than mileage. Radial tires also benefit from being exercised periodically instead of sitting in one position for extended stretches.
Storage conditions matter almost as much as road use. Keeping the truck away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve the tire casing and sidewall appearance. A quick walkaround before each drive is worthwhile on older vehicles, especially if the S15 has not been driven recently. Catching air loss or aging early is far easier than dealing with it on the road.
