GMC Sprint Tires

GMC Sprint uses these sizes across the 1971-1979 production run: F70-14, F78-14, and F60-15 for 1971-1972; G70-14, G78-14, GR70-14, and H78-14 for 1973-1974; GR78-15, HR78-15, and GR70-15 for 1975-1977; and G70-14, GR70-14, and H78-14 for 1978-1979. The 14-inch sizes mount on 14-inch wheels, while F60-15, GR78-15, HR78-15, and GR70-15 mount on 15-inch wheels.

The important point is that GMC Sprint did not use one tire size through its full production run, and several years carry three or four possible sizes. Start with the year, then confirm the actual wheel diameter and the size already on the vehicle before choosing between bias-ply and radial-style replacements.

GMC Sprint uses both 14-inch and 15-inch wheel applications depending on year and configuration. The early years 1971-1972 include both 14-inch and 15-inch sizes, 1973-1974 return to 14-inch sizes, 1975-1977 use 15-inch radial-style sizes, and 1978-1979 are listed with 14-inch sizes again.

That means wheel diameter is the first thing to verify on any GMC Sprint, especially if the vehicle has changed hands or has been restored over time. Measure the wheel or confirm the stamped wheel size before selecting a tire, because two sizes that look similar on paper may require completely different rims.

A 1973 GMC Sprint has four sizes listed because GMC Sprint was offered with more than one tire and wheel configuration within the same model year. For 1973, the listed choices are G70-14, G78-14, GR70-14, and H78-14, all on 14-inch wheels, but they represent different width, profile, and construction families rather than one universal fitment.

That kind of split means the correct choice depends on the specific configuration of the vehicle, not the year alone. Check the wheel diameter, compare the size on the vehicle now, and verify whether the goal is a bias-ply restoration look or a radial-style fitment before settling on one of the four listed options.

The bias-ply GMC Sprint sizes listed here use tube-type fitment guidance, including F70-14, F78-14, F60-15, G70-14, G78-14, and H78-14. The radial-style sizes GR70-14, GR78-15, HR78-15, and GR70-15 are not presented the same way, so the tube requirement is tied mainly to the non-radial alphanumeric bias-ply applications.

If your GMC Sprint is being restored with period-style bias-ply tires, plan around proper tube fitment and make sure the wheel condition supports it. If the vehicle uses one of the radial-style sizes, confirm the wheel design and construction before assuming it should be set up the same way as an earlier bias-ply application.

A 1975 GMC Sprint is listed with GR78-15, HR78-15, and GR70-15, all of them 15-inch radial-style sizes. The letter group identifies the width and load family, the 70 or 78 number identifies the profile series, and the 15 confirms the wheel diameter.

Begin by confirming that the vehicle actually carries 15-inch wheels, then compare the current tire size and the vehicle’s overall stance goals. A GMC Sprint restored to match its original configuration should keep the same size family it was built with, while a changed wheel-and-tire package should be treated carefully before returning to a period-correct fitment.

GMC Sprint tire offerings include RWL, redline, pin white stripe, blackwall, narrow whitewall, dual white stripe, and wide whitewall sidewall styles, depending on size. Some sizes are strongly performance-oriented with raised white letter, redline, or pin stripe treatments, while others are available in fuller whitewall styles more associated with comfort or luxury presentation.

The right sidewall style depends on the look you want and the exact size your GMC Sprint uses. A muscle-era or sport-themed truck often looks more natural with RWL, redline, or pin stripe treatments, while a whitewall selection can suit a more formal trim presentation if that matches the wheel and overall restoration direction.

GMC Sprint tires in these listed sizes are available from Firestone, Goodyear, Coker Classic, and BFGoodrich. Brand availability varies by size, so one GMC Sprint size may offer several choices while another may be limited to a single brand or style.

That size-by-size brand variation matters when planning a full restoration or trying to match an established look on the vehicle. Once the correct GMC Sprint size is confirmed, compare the available sidewall styles and tire series within that size instead of assuming every brand offers the same combinations.

GMC Sprint tire series listed here include Firestone Wide Oval, Goodyear Custom Wide Tread, Goodyear Speedway Wide Tread, Goodyear Polyglas GT, Coker Classic Bias Ply, Silvertown Classic Bias Ply, Goodyear GM Custom Tread, and Goodyear Steelgard. Those series represent different visual and construction approaches, ranging from period bias-ply performance styles to later radial-style designs with a more modern driving character.

A GMC Sprint owner should use the series name as a clue to the tire’s era feel and intended appearance, not just as branding. Earlier bias-ply series are the natural choice for a period-correct restoration look, while the radial-style series make more sense when preserving later-1970s road manners and appearance within the correct size family.

A GMC Sprint should be stored in a cool, dry, dark space with the tires kept away from direct sunlight, electric motors, ozone sources, and petroleum contamination. Clean tires and proper inflation matter, because collector vehicles often sit for long periods and can develop flat spotting or sidewall stress even when tread wear is minimal.

If the GMC Sprint is parked for extended stretches, move it periodically or use methods that reduce sustained load on one contact patch. Storage habits have a direct effect on how a vintage tire ages, so keeping the vehicle sheltered and the tires protected will do more for longevity than low annual mileage alone.

Tires on a GMC Sprint should be inspected before each drive and more thoroughly several times a year, even if the vehicle covers very few miles. Collector tires can age out long before they wear out, and issues like cracking, impact damage, bead problems, or irregular shape may appear while the vehicle is simply sitting.

A practical inspection routine includes checking inflation, sidewalls, tread surface, valve hardware, and any sign that one tire is carrying differently than the others. On a GMC Sprint with staggered-looking period styles or multiple past wheel changes, that quick inspection also helps catch a mismatched size or construction before it affects handling.

Tires on a GMC Sprint should be replaced when age, cracking, hardening, vibration, separation, or damage appears, even if the tread still looks deep. Collector vehicles often preserve tread because they are driven sparingly, but rubber condition and structural integrity matter far more than appearance alone.

An older GMC Sprint can seem roadworthy at a glance while riding on tires that are no longer suitable for regular use. Have the tires evaluated as part of normal service intervals, and treat age-related deterioration as a replacement trigger even when the vehicle remains mostly a weekend, cruise, or show machine.

GMC Sprint was fitted across its production run with several period-appropriate alphanumeric sizes rather than one single tire specification. The listed size families include early bias-ply F-series and G-series applications, later 14-inch G and H bias-ply choices, and mid-1970s GR and HR radial-style fitments on 15-inch wheels.

For restoration work, the correct answer depends on the exact year and configuration of the GMC Sprint being restored. A factory-authentic result comes from matching the year, wheel diameter, and size family correctly, then selecting a sidewall style and tire series that suit the appearance and trim level of that specific vehicle.

Correct tire fitment can absolutely affect the presentation, credibility, and judged accuracy of a GMC Sprint restoration. Size, construction type, wheel diameter, sidewall treatment, and overall stance all contribute to whether the vehicle looks right for its year and intended configuration.

A GMC Sprint wearing the wrong profile, the wrong sidewall style, or the wrong wheel diameter can look noticeably off even to casual enthusiasts. For higher-level restoration or show use, compare the vehicle against period photos, marque references, and knowledgeable club standards so the tires support the truck’s authenticity rather than working against it.

GMC Sprint restoration choices can include RWL, redline, pin white stripe, blackwall, narrow whitewall, dual white stripe, or wide whitewall, depending on the size being used. That means there is no single correct sidewall style for every GMC Sprint, because the vehicle spans sporty early-1970s performance looks and more formal trim presentations later in the decade.

The best approach is to choose the sidewall style that matches the exact year, wheel package, and appearance you are trying to reproduce on the GMC Sprint. Performance-oriented builds often favor raised white letter or redline looks, while whitewall options can be appropriate where a more upscale or less aggressive visual treatment is the goal.

A GMC Sprint can be driven on public roads with properly selected, correctly mounted, and well-maintained collector tires, but the right tire depends on the vehicle’s exact size and construction requirements. Bias-ply and radial-style tires do not behave the same way, and a GMC Sprint fitted with the wrong size or wheel diameter can suffer from compromised handling and clearance.

Road use should begin with a full inspection of the tires, wheels, steering, brakes, and suspension, especially on a vehicle that has spent years in storage or has been restored in stages. Matching the tire to the wheel and using a consistent construction type across the set are basic steps toward stable and predictable operation.

Before driving a GMC Sprint, check inflation, visible sidewall condition, tread surface, wheel security, and whether all four tires are the same size family and construction type intended for the vehicle. On GMC Sprint in particular, it is also wise to confirm that the wheel diameter matches the tire size, since both 14-inch and 15-inch applications appear during the production run.

A short walk-around catches many problems that are easy to miss in a stored collector vehicle. If the GMC Sprint shows pulling, vibration, wandering, or unusual ride height once moving, stop and inspect the tires again before assuming the issue lies elsewhere in the chassis.

A GMC Sprint on period-style tires should be driven at speeds appropriate to the tire’s construction, age, condition, and the overall mechanical state of the vehicle. Bias-ply tires generally deliver a different feel from radial-style tires, with more sensitivity to grooves, crown, and steering input, so comfortable cruising speed may be lower than a modern driver expects.

Use common sense and build speed gradually after the tires and vehicle have been inspected and warmed through normal operation. If the GMC Sprint is on older collector tires or a fresh restoration of unknown road manners, conservative driving is the wise approach until the vehicle proves stable, smooth, and predictable.