The 1986 GMC Trucks S15 Jimmy sits in the compact SUV era when truck-based utility and everyday drivability were coming together in a smaller, more manageable package. Buyers still appreciate these trucks for their square-body styling, practical proportions, and honest 1980s character. Tire fitment on the 1986 GMC Trucks S15 Jimmy centers on radial construction, with 195/75R15, 205/75R15, and 235/75R15 sizes depending on sub-model. That opens the door to very different looks, from narrow and wide whitewalls to redline, goldline, raised white letter, and more truck-oriented tread choices. The key is matching the exact sub-model and wheel setup before choosing appearance, load capability, and overall driving intent.
Which Tire Size Is Right for The 1986 GMC Trucks S15 Jimmy
Three tire sizes apply to the 1986 GMC Trucks S15 Jimmy, and the right one depends first on the exact sub-model. All use radial construction on a 15-inch rim, but the Base, Gypsy, and Sierra Classic use 195/75R15 or 205/75R15, while the w/Z71 Pkg. uses 235/75R15. Once that is confirmed, the decision shifts to sidewall style, tire series, brand, and the wheel width range that best matches the tire you are considering.
195/75R15 is a metric radial size in which 195 identifies the nominal section width in millimeters, 75 is the aspect ratio, R denotes radial construction, and 15 is the rim diameter in inches. On the 1986 GMC Trucks S15 Jimmy, this size belongs to certain non-Z71 sub-model applications and keeps the fitment within a traditional 15-inch wheel package. Available choices include Coker Classic and American Classic tires in Star Series and American Classic Radial lines, with narrow whitewall and wide whitewall sidewall treatments. It is a useful size to evaluate when preserving a stock-style overall look on the sub-models that use it.
205/75R15 follows the same metric radial sizing convention, with a 205-millimeter nominal section width, a 75-series profile, radial construction, and a 15-inch rim diameter. This size is used on the same 1986 GMC Trucks S15 Jimmy sub-model group as 195/75R15, so selection often comes down to confirming which of the two belongs on the truck in front of you. Product variety is especially broad here, with BFGoodrich, American Classic, Coker Classic, Tornel, Maxxis, and Travelstar options across whitewall, redline, and goldline styles. It is the size with the widest range of appearance-driven choices for a restoration-minded or custom presentation.
235/75R15 is a larger metric radial format, using a 235-millimeter nominal section width, a 75-series profile, radial construction, and a 15-inch rim. On the 1986 GMC Trucks S15 Jimmy, this size is tied to the w/Z71 Pkg. configuration rather than the other covered sub-models. Available tires span both classic-looking whitewall options and a more truck-focused raised white letter BFGoodrich All-Terrain T/A KO2, along with several radial series from American Classic, BFGoodrich, Coker Classic, Tornel, Maxxis, and Travelstar. It is the size to focus on when the truck's package and wheel setup call for the broader 15-inch fitment.
Sub-model fitment matters on the 1986 GMC Trucks S15 Jimmy because not every version uses the same tire size. Base, Gypsy, and Sierra Classic share the smaller 15-inch radial fitments, while the w/Z71 Pkg. moves to a larger 235/75R15 size, so identifying the exact trim is the first step.
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1986 GMC Trucks S15 Jimmy Base
The 1986 GMC Trucks S15 Jimmy Base uses the same pair of radial size options as the other non-Z71 sub-models. Tire selection here usually comes down to confirming which of those two sizes is on the truck, then choosing the sidewall style and tire series that best suit a stock-style or custom look.
The 1986 GMC Trucks S15 Jimmy Gypsy shares the smaller radial fitment group rather than the wider Z71 package size. That keeps the focus on verifying the exact wheel-and-tire combination already on the vehicle before narrowing the choice by brand, whitewall treatment, or a more style-driven sidewall design.
The 1986 GMC Trucks S15 Jimmy Sierra Classic follows the same basic tire-fitment pattern as the other standard sub-models, using one of the two smaller radial sizes. Once the correct size is confirmed, the available tires offer room to tailor the truck's appearance through narrow or wide whitewalls and different radial series.
The 1986 GMC Trucks S15 Jimmy w/Z71 Pkg. uses 235/75R15 radial tires, setting it apart from the other covered sub-models. That larger size changes the buying decision toward broader-fitment tire options, including both classic whitewall styles and a raised white letter all-terrain presentation.
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 1986 GMC Trucks S15 Jimmy Tires for Sale
Available 1986 GMC Trucks S15 Jimmy tires cover all three primary radial sizes and include brands such as BFGoodrich, American Classic, Coker Classic, Tornel, Maxxis, and Travelstar. The product grid is where to compare whitewall widths, redline or goldline styling, raised white letter options, tire series, and the rim-width ranges tied to each size.
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Radial Tires
Coker Classic Star Series | 2.25 Inch Whitewall | 195/75R15
Common questions for the 1986 GMC Trucks S15 Jimmy usually center on the correct sub-model tire size, 15-inch rim fitment, the difference between the smaller and larger radial options, appearance choices, and what to inspect before putting a collector-era truck back on the road.
Tire Size & Fitment
What tire size fits a 1986 GMC Trucks S15 Jimmy?
The 1986 GMC Trucks S15 Jimmy uses three possible tire sizes: 195/75R15, 205/75R15, and 235/75R15, all in radial construction. Base, Gypsy, and Sierra Classic models use the smaller 195/75R15 or 205/75R15 fitments, while the w/Z71 Pkg. uses 235/75R15.
Choosing the right one starts with confirming the exact sub-model and then checking the wheel setup already on the truck. Since all three sizes share a 15-inch rim diameter, the real differences are width and overall proportions, so it is worth comparing the existing tire size placard, wheel width, and vehicle stance before selecting a replacement.
What size rim does a 1986 GMC Trucks S15 Jimmy use?
Every primary tire size used on the 1986 GMC Trucks S15 Jimmy is built for a 15-inch rim. That applies whether the truck uses 195/75R15, 205/75R15, or the larger 235/75R15 size found on the w/Z71 Pkg. configuration.
Rim diameter is only the first part of the fitment picture, because wheel width also matters when comparing specific tires. Before choosing a replacement, check that the wheel is still the original diameter and has not been changed during the truck's life, then compare the tire's recommended rim-width range to the wheel actually mounted on the vehicle.
Do all 1986 GMC Trucks S15 Jimmy sub-models use the same tire size?
No, the 1986 GMC Trucks S15 Jimmy does not use one universal tire size across every sub-model. Base, Gypsy, and Sierra Classic share the smaller 195/75R15 and 205/75R15 radial fitments, while the w/Z71 Pkg. uses the larger 235/75R15 radial size.
That difference matters because a truck may still wear replacement wheels or tires that no longer reflect its original sub-model fitment. When tire size varies by trim, it helps to confirm the exact model designation, inspect the current wheel-and-tire combination, and make sure the replacement size matches both the truck's configuration and available wheel clearance.
Choosing the Right Tire
What should I consider when choosing a tire for a 1986 GMC Trucks S15 Jimmy?
Start with the correct size for the sub-model, since the 1986 GMC Trucks S15 Jimmy can use 195/75R15, 205/75R15, or 235/75R15 depending on configuration. From there, compare radial tire series, sidewall style, load capacity, and the rim-width range tied to the specific tire you are considering.
Appearance and intended use should guide the final decision. A whitewall tire can give the truck a more restoration-oriented look, while a raised white letter all-terrain choice changes the character noticeably. It also helps to compare the wheel width on the truck now, especially if the S15 Jimmy has been updated with aftermarket wheels over the years.
What sidewall styles are available for 1986 GMC Trucks S15 Jimmy tires?
Sidewall choices for the 1986 GMC Trucks S15 Jimmy include narrow whitewall, wide whitewall, redline, goldline, and raised white letter depending on tire size. Most of the 195/75R15 and 205/75R15 choices lean toward passenger-style whitewall or specialty sidewall treatments, while 235/75R15 also includes a raised white letter all-terrain option.
That gives the truck a wide styling range without changing the basic 15-inch fitment. A whitewall treatment can suit a cleaner period-style presentation, redline or goldline adds a more custom visual accent, and raised white letters push the look toward a more utility-oriented truck stance. Matching the sidewall style to the truck's trim and finish usually creates the most coherent result.
What brands offer tires for the 1986 GMC Trucks S15 Jimmy?
Tires for the 1986 GMC Trucks S15 Jimmy are available from BFGoodrich, American Classic, Coker Classic, Tornel, Maxxis, and Travelstar across the covered sizes. Brand availability varies by size, with the broadest mix appearing in 205/75R15 and 235/75R15.
Brand choice is only one part of the comparison. It helps to look at the tire series, sidewall treatment, and wheel-width compatibility within the size that fits the truck, because two tires from different brands may suit very different goals. One may lean toward classic visual character, while another may make more sense for a truck-style presentation.
Restoration & Appearance
Which tire should I choose for a period-style 1986 GMC Trucks S15 Jimmy?
A period-style 1986 GMC Trucks S15 Jimmy usually starts with the correct sub-model size and then narrows the choice by sidewall treatment and tire series. The smaller non-Z71 sizes offer several whitewall, redline, and goldline options, while 235/75R15 gives the Z71 package room for whitewall or raised white letter presentations.
The best visual match depends on how the truck is being presented rather than on one universal appearance rule. Some restorations look right with a restrained narrow whitewall, while others benefit from a wider whitewall or a more truck-oriented sidewall style. When exact originality matters, marque-specific references and period photos are worth checking before settling on one look.
How does tire construction affect the appearance of a restored 1986 GMC Trucks S15 Jimmy?
Tire construction is straightforward on the 1986 GMC Trucks S15 Jimmy because the primary fitments are radial sizes. That means the appearance differences come less from bias-ply versus radial construction and more from the profile, sidewall treatment, brand styling, and whether the tire carries a whitewall, redline, goldline, or raised white letter presentation.
For a restored truck, those visual details can change the personality of the vehicle more than many buyers expect. A narrow whitewall tends to look understated, a wide whitewall reads more formal, and raised white letters give a stronger truck-and-utility feel. The cleanest result usually comes from matching the sidewall style to the trim level, wheel design, and intended era impression.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1986 GMC Trucks S15 Jimmy?
Yes, modifications can affect tire fitment on a 1986 GMC Trucks S15 Jimmy even when the nominal tire size looks correct. Aftermarket wheels, suspension changes, ride-height changes, or body alterations can all influence whether a 195/75R15, 205/75R15, or 235/75R15 tire has the clearance and wheel support it needs.
That is especially important on older trucks that may have seen decades of changes. Checking wheel diameter, wheel width, steering clearance, and fender space before mounting new tires can prevent expensive mistakes. A truck equipped like a stock Sierra Classic may accept different tire choices than one that has been lifted, lowered, or fitted with non-original wheels.
What should I inspect before driving a 1986 GMC Trucks S15 Jimmy on new tires?
Before driving a 1986 GMC Trucks S15 Jimmy on new tires, inspect the wheels, valve stems, lug hardware, and the surrounding suspension and steering components. It also helps to make sure the new tires are inflated appropriately, seated correctly on the wheels, and free from any obvious clearance issues at full steering lock.
A slow first road test is a smart final check on a collector-era truck. Listen for rubbing, feel for vibration, and recheck inflation after the first few drives. Since many older S15 Jimmys spend time parked, it is also worth looking over brake condition, wheel-bearing play, and alignment-related tire wear patterns before settling into regular road use.
How should tires on a collector 1986 GMC Trucks S15 Jimmy be maintained?
Tires on a collector 1986 GMC Trucks S15 Jimmy should be inspected regularly for air loss, cracking, bulges, cuts, and uneven tread wear, even if the truck is driven only occasionally. Radial tires can age out visually and structurally long before mileage alone suggests replacement, especially on vehicles that spend long periods parked.
Storage conditions make a real difference on a low-use truck. Keeping the S15 Jimmy away from prolonged sunlight, moisture, excess heat, and ozone sources can help preserve the tires, and maintaining proper inflation reduces flat-spotting and sidewall stress. A brief inspection before every outing is a good habit, particularly before a longer highway drive.
