The 1989 GMC Trucks S15 sits in the compact-pickup era when small trucks had become everyday transportation as much as weekend utility rigs. By this point, the S15 balanced practical size with a more modern road feel than earlier compact pickups, which makes tire choice especially important today. This truck uses radial fitments in 195/75R14, 205/75R14, and 215/65R15, so the first step is confirming the wheel diameter and actual setup on the truck. Available choices range from traditional whitewall styles to redline, raised white letter, and outline white letter designs. That makes it possible to match the tire not just to fitment, but also to the truck's restoration direction and road-use plans.
Which Tire Size Is Right for The 1989 GMC Trucks S15
The 1989 GMC Trucks S15 uses three primary tire sizes, and the right one depends first on wheel diameter. Two sizes use a 14-inch rim, while one uses a 15-inch rim, so confirming the truck's actual wheels matters before comparing sidewall style, brand, or tire series. Since the covered sub-models share these same size options, the real decision is matching the tire to the truck's wheel setup and desired appearance.
195/75R14 is a metric radial size in which 195 is the section width in millimeters, 75 is the aspect ratio, R identifies radial construction, and 14 is the rim diameter in inches. On the 1989 GMC Trucks S15, this size keeps the buyer in a 14-inch radial fitment with a more traditional light-truck-era sizing format. Available options include Coker Classic, Tornel, Maxxis, and Travelstar offerings, with narrow whitewall and wide whitewall sidewall treatments across several series. It is a useful size to consider when the truck already has 14-inch wheels and the goal is a clean, road-friendly period-style presentation.
205/75R14 follows the same metric radial format, with a 205-millimeter section width, a 75-series profile, radial construction, and a 14-inch rim. For the 1989 GMC Trucks S15, it is another 14-inch primary fitment, but with a wider product selection than the smaller 195 size. Choices include American Classic, Coker Classic, Maxxis, Tornel, BFGoodrich, and Travelstar, with narrow whitewall, wide whitewall, and redline options across several tire series. This size makes sense when the truck uses 14-inch wheels and the buyer wants broader appearance and brand choices within the correct fitment family.
215/65R15 is a metric radial size where 215 gives the section width in millimeters, 65 is the aspect ratio, R marks radial construction, and 15 is the wheel diameter. On the 1989 GMC Trucks S15, this size moves the fitment to a 15-inch rim, so wheel confirmation is essential before selection. Product choices include Goodyear, Cooper, and BFGoodrich lines with outline white letter, raised white letter, redline, and wide whitewall sidewall styles. It is the size to evaluate when the truck is equipped with 15-inch wheels and the owner wants either a sportier sidewall look or a more traditional whitewall presentation.
Fitment is straightforward across the covered 1989 GMC Trucks S15 sub-models because Base, High Sierra, and Sierra Classic all use the same three primary tire sizes. Checking the exact sub-model still helps keep the truck's appearance and tire style in line with the way it is being restored, preserved, or driven.
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1989 GMC Trucks S15 Base
The 1989 GMC Trucks S15 Base uses the same radial size choices as the other covered sub-models, so selection comes down more to wheel diameter than trim name. Once the truck's 14-inch or 15-inch wheel setup is confirmed, the main choice is between whitewall, redline, RWL, or OWL styling and the available tire series.
The 1989 GMC Trucks S15 High Sierra shares the same primary radial fitments as the rest of the range, with 14-inch and 15-inch wheel-based options. That means tire selection is less about sub-model differences and more about verifying the truck's actual wheels, then choosing the sidewall treatment and brand character that suit the truck.
The 1989 GMC Trucks S15 Sierra Classic follows the same fitment pattern as the other covered S15 sub-models, including both 14-inch and 15-inch tire choices. For this trim, the practical decision is confirming the wheel size already on the truck and then selecting a radial that matches the intended look, whether that is traditional whitewall or a more performance-oriented lettered sidewall.
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 1989 GMC Trucks S15 Tires for Sale
Available 1989 GMC Trucks S15 tires span 14-inch and 15-inch radial fitments from Coker Classic, American Classic, BFGoodrich, Goodyear, Cooper, Maxxis, Tornel, and Travelstar. The product grid gives the buyer meaningful choices in tire series, whitewall width, redline styling, RWL, OWL, and rim-width compatibility.
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Radial Tires
Coker Classic Star Series | 2.25 Inch Whitewall | 195/75R14
These FAQs focus on the real tire questions for a 1989 GMC Trucks S15, including size selection, 14-inch versus 15-inch wheel fitment, sidewall and brand choices, and the basic inspections that matter before putting a compact pickup back on the road.
Tire Size & Fitment
What tire size fits a 1989 GMC Trucks S15?
A 1989 GMC Trucks S15 uses three primary radial tire sizes: 195/75R14, 205/75R14, and 215/65R15. The first two sizes are for 14-inch wheels, while 215/65R15 is for a 15-inch wheel. Base, High Sierra, and Sierra Classic models all share these same size options.
The key step is confirming which wheel diameter is actually on the truck before choosing a tire. Many S15s have been updated over time, so the trim name alone is not enough to choose between the 14-inch and 15-inch fitments. After that, the decision shifts to sidewall style, brand, and tire series.
What size rim does a 1989 GMC Trucks S15 use?
The 1989 GMC Trucks S15 uses either a 14-inch or 15-inch rim, depending on the tire size on the truck. The 195/75R14 and 205/75R14 sizes both use 14-inch rims, while 215/65R15 uses a 15-inch rim. All of these are radial tire fitments.
Wheel diameter should be checked directly on the truck before ordering tires, especially on a compact pickup that may have had wheels swapped over the years. It also helps to verify wheel width against the tire being considered, since the available products do not all share the same rim-width specifications.
Do all 1989 GMC Trucks S15 sub-models use the same tire size?
Base, High Sierra, and Sierra Classic versions of the 1989 GMC Trucks S15 share the same three primary tire sizes: 195/75R14, 205/75R14, and 215/65R15. That means tire fitment does not change by sub-model within this group. The real difference is whether the truck is equipped with 14-inch or 15-inch wheels.
Even with shared sub-model fitment, it is still smart to inspect the truck before selecting a tire. A previous owner may have changed wheels, suspension height, or overall setup, which can affect what is currently on the vehicle. Matching the tire to the actual wheel and intended appearance avoids unnecessary guesswork.
Choosing the Right Tire
What should I consider when choosing a tire for a 1989 GMC Trucks S15?
Start with the correct primary size for the truck's wheels: 195/75R14, 205/75R14, or 215/65R15. From there, compare radial construction details such as rim-width compatibility, load figures where shown, tire series, and sidewall style. The available choices range from traditional whitewalls to redline and lettered performance-style sidewalls.
The right pick depends on how the S15 is being used and how it is meant to look. A restoration-oriented truck may lean toward whitewall styling, while a more custom or sport-flavored build may point toward RWL, OWL, or redline treatments. Checking wheel size and width first keeps those appearance choices grounded in correct fitment.
What sidewall styles are available for 1989 GMC Trucks S15 tires?
Sidewall choices for the 1989 GMC Trucks S15 include narrow whitewall, wide whitewall, redline, RWL, and OWL depending on tire size. The 14-inch sizes focus heavily on whitewall options, with redline also available in 205/75R14. The 15-inch 215/65R15 size adds RWL and OWL choices alongside redline and wide whitewall.
That variety lets the tire do more than simply fit the truck. A whitewall can give the S15 a more traditional late-classic presentation, while RWL and OWL lean more toward a sport-truck or custom look. The best choice is the one that matches the truck's wheel size and the overall visual direction of the build.
What brands offer tires for the 1989 GMC Trucks S15?
Tires for the 1989 GMC Trucks S15 are available from Coker Classic, American Classic, BFGoodrich, Goodyear, Cooper, Maxxis, Tornel, and Travelstar. Brand availability varies by size, with 205/75R14 carrying the broadest mix of brands and sidewall treatments. All of the primary fitments offered here are radial tires.
Brand choice should be compared alongside size, sidewall style, tire series, and wheel compatibility rather than as a stand-alone decision. One brand may have the whitewall width or lettered look that suits the truck, while another may better match the wheel width already in use. Keeping the fitment correct comes first.
Restoration & Appearance
Which tire should I choose for a period-style 1989 GMC Trucks S15?
A period-style 1989 GMC Trucks S15 usually starts with the correct wheel diameter and one of its primary radial sizes: 195/75R14, 205/75R14, or 215/65R15. After that, the tire choice often comes down to sidewall appearance. Whitewall options are available in both 14-inch sizes and in 215/65R15 for buyers seeking a more traditional presentation.
The most convincing restoration-oriented result usually comes from matching the tire's visual character to the truck's trim, wheels, and overall finish rather than focusing on size alone. If exact originality matters, vehicle-specific literature and marque references are worth checking before choosing between narrow whitewall, wide whitewall, redline, or lettered sidewalls.
How does tire construction affect the appearance of a restored 1989 GMC Trucks S15?
On a 1989 GMC Trucks S15, the primary fitments are already radial, so the construction itself is not a bias-ply versus radial appearance decision. The visual difference comes more from sidewall treatment and tire series than from the basic construction type. Whitewall, redline, RWL, and OWL options all change the truck's character noticeably.
That matters on a restored or preserved S15 because the tire can shift the truck toward stock-style, custom, or sport-truck territory very quickly. A narrow or wide whitewall gives a more traditional look, while redline and lettered sidewalls feel more assertive. Matching that visual tone to the wheels and stance creates a more coherent finished result.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1989 GMC Trucks S15?
Yes, modifications can affect tire fitment on a 1989 GMC Trucks S15 even when the tire size itself is one of the correct primary options. Aftermarket wheels, changed wheel width, altered offset, lowered suspension, or body changes can all influence clearance. This matters most when choosing between the truck's 14-inch and 15-inch fitments.
A modified S15 should be checked at the wheel opening and through the steering range before settling on a tire. Looking at clearance to fenders, inner wheelhouses, and suspension components helps prevent surprises. Tire selection is much easier when the actual wheel size and the truck's present stance are confirmed first.
What should I inspect before driving a 1989 GMC Trucks S15 on new tires?
Before driving a 1989 GMC Trucks S15 on new tires, inspect the wheels for correct diameter and condition, confirm the tires are properly mounted, and make sure inflation is set appropriately for the tire and application. It is also wise to look over suspension and steering components, since loose or worn parts can affect how the truck tracks.
A short initial road test should include checking for rubbing, vibration, and any sign of uneven clearance at full steering lock. Rechecking pressure after the first drive is a sensible habit on an older pickup. If the truck has sat for long periods, a broader inspection of brakes, shocks, and alignment condition is also worthwhile.
How should tires on a collector 1989 GMC Trucks S15 be maintained?
Collector-use tires on a 1989 GMC Trucks S15 should be inspected regularly for cracking, bulges, cuts, irregular tread wear, and slow air loss. Pressure matters even on a lightly driven truck, because underinflation during storage can affect how the tire carries weight. Occasional movement also helps avoid long-term flat spotting.
Storage conditions make a difference on a low-use S15. Keeping the truck away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve the tires over time. It also pays to inspect the tires before each outing rather than assuming low mileage means low risk, especially on a vehicle used only seasonally.
