1979 Chevrolet C/K Pickup Tires

A 1979 Chevrolet C/K Pickup does not use one universal tire size. Depending on the exact C10, C20, C30, K10, K20, or K30 configuration, primary sizes include 700-15, GR78-15, HR78-15, 650-16, L78-15, LR78-15, 875-16.5, 950-16.5, 750-16, 8.75R16.5, 8.75-16, 10-15, and 10-16.5.

The important next step is identifying the truck's exact sub-model and GVWR, then confirming the wheel diameter on the vehicle. This truck family spans half-ton to one-ton applications and uses 15-inch, 16-inch, and 16.5-inch wheels, so relying on the model name alone can easily lead to the wrong tire size.

The 1979 Chevrolet C/K Pickup uses more than one rim diameter across the model range. Depending on the application, the truck can use 15-inch, 16-inch, or 16.5-inch rims, which correspond to different tire families including 700-15, L78-15, 650-16, 750-16, 875-16.5, 950-16.5, and others.

Confirming wheel diameter should come before comparing brands or constructions, especially on older trucks that may have had wheel swaps. A 16-inch tire does not belong on a 16.5-inch wheel, and several C20, C30, K20, and K30 applications sit close enough in size naming to cause confusion if the wheel is not checked first.

Chevrolet used many tire sizes on the 1979 C/K Pickup because the truck line covered light-duty and heavy-duty versions, two-wheel-drive and four-wheel-drive models, and multiple GVWR ratings. Some applications also offered both bias-ply and radial-type fitments, while others changed between 15-inch, 16-inch, and 16.5-inch wheel diameters.

That variety means the correct tire depends on the exact truck, not just the year and model name. A C10, K10, or Big 10 truck can follow a very different fitment path than a C30 or K30 work truck, so sub-model, GVWR, and the actual wheels on the vehicle should all match before choosing tires.

That depends on the specific sub-model and the tire size associated with it. The 1979 Chevrolet C/K Pickup range includes true bias-ply fitments such as 700-15, 650-16, 750-16, 875-16.5, 950-16.5, 10-15, and 10-16.5, plus radial-format sizes such as GR78-15, HR78-15, LR78-15, and 8.75R16.5 on certain applications.

Bias-ply tires usually make the most sense when preserving a traditional period-style truck presentation, while radial fitments may matter when the truck is already set up around a radial-size application. Construction changes should always be checked against the wheel, the intended use of the truck, and any steering or suspension changes that could affect the final fit.

Radial equivalents for L78-15 include 235R15 as an 80-series metric radial, P235/75R15 as a P-metric 75-series radial, P255/70R15 as a P-metric 70-series radial, and 820R15 as a bias-look radial equivalent. These options apply to the L78-15 fitment used on certain 1979 Chevrolet C/K Pickup Big 10 applications.

Each of those alternatives uses a different sizing convention or profile approach, so the choice is not just radial versus bias-ply. The recommended rim-width range is 6 to 8 inches, and the truck's wheel size, tire clearance, and overall setup should be verified before moving from the original L78-15 bias-ply format to any radial equivalent.

Start by confirming that the truck's original application actually has a radial equivalent available in the size you are considering. On this truck range, L78-15 has radial-equivalent choices, while other fitments may instead be original bias-ply sizes or separate radial-format fitments tied to certain sub-models such as GR78-15, HR78-15, LR78-15, or 8.75R16.5.

Wheel diameter and wheel width should be checked first, followed by tire clearance at the fenders, steering, and suspension. It also helps to inspect the truck for aftermarket wheels, lift or lowering changes, and uneven ride height, since older pickups often carry modifications that affect how well a radial alternative suits the vehicle.

Begin with the exact size and wheel diameter required by the truck's sub-model, because this range spans 15-inch, 16-inch, and 16.5-inch fitments in both bias-ply and radial form. After that, narrow the choice by construction type, sidewall appearance, tread style, and whether the truck is being kept in a restoration-oriented presentation or used more as a working vehicle.

A C10 or Big 10 owner may care more about period-style sidewalls and vintage sizing language, while a heavier C20, C30, K20, or K30 application often centers on truck-service tread patterns and wheel compatibility. Matching the tire to the truck's real use and actual wheel setup usually matters more than simply choosing the most familiar brand name.

Sidewall styles for 1979 Chevrolet C/K Pickup tires vary by size, but the range includes blackwall, wide whitewall, narrow whitewall, and dual-white-stripe options. Most heavy-duty truck sizes stay focused on blackwall presentations, while certain light-duty sizes such as 700-15, 650-16, 750-16, L78-15, and LR78-15 offer more appearance-oriented choices.

That makes sidewall selection closely tied to the role of the truck. A work-oriented C20, C30, K20, or K30 often suits a plain blackwall truck tread, while a C10 or Big 10 being restored for show or weekend use may justify a whitewall or stripe treatment that better matches the truck's period-inspired look.

Brands appearing in 1979 Chevrolet C/K Pickup sizes include Firestone, BFGoodrich, Coker Classic, STA, Lester, Goodyear, Garfield, Excelsior, and Tornel. The exact brand selection depends heavily on tire size, with some fitments offering broad variety and others, especially heavy-duty truck sizes, concentrating on a smaller group of purpose-built choices.

Brand comparison only matters after the correct size and wheel diameter are settled. A 650-16 or 700-15 owner may have several traditional-style options to compare, while a 950-16.5 or 10-16.5 buyer is more likely to focus on tread series, load-oriented design, and wheel compatibility within a narrower range of available products.

A period-style choice starts with the truck's exact original-type size format, whether that is a numeric bias-ply size like 700-15 or 750-16, an alphanumeric bias-ply size like L78-15, or a period radial format such as GR78-15, HR78-15, or LR78-15. The right look begins with the right fitment family before sidewall style enters the decision.

Once the correct size family is confirmed, sidewall treatment and tread character can help shape the final presentation. Buyers pursuing a stricter restoration should compare the truck to period photos, marque resources, or build-related references, while those aiming for a faithful vintage look can choose a tire that matches the era without claiming exact factory originality.

Tire construction changes the visual character of a restored 1979 Chevrolet C/K Pickup because bias-ply and radial tires often present differently even when they belong to the same general size family. On this truck range, some applications remain firmly bias-ply, while others use period radial formats or, in the case of LR78-15, a bias-look radial presentation.

That means appearance decisions should be made alongside fitment decisions, not after them. A traditional truck restoration may lean toward the original-style construction family for the sub-model, while a more road-use-oriented project might consider a radial-style option that still keeps a vintage visual theme, provided the wheel and vehicle setup are checked first.

Yes, modifications can change tire fitment on a 1979 Chevrolet C/K Pickup even when the chosen tire is the correct size for the original application. Aftermarket wheels, wheel-width changes, suspension lifts, lowering, spring changes, steering components, and body alterations can all affect how a tire clears the truck at full turn or under load.

That is especially important on K-series four-wheel-drive trucks and heavier C20, C30, and K30 models that may have spent decades in work service. Checking the actual wheel diameter, wheel width, and visible clearance around the fenders and suspension can prevent choosing a tire that matches the catalog fitment but conflicts with the truck's present setup.

Before road use, inspect wheel condition, lug hardware, valve stems, and basic alignment of the truck's setup with the tire size being installed. It also helps to look over suspension and steering parts, especially on older pickups, because loose or worn components can affect tire wear, tracking, and clearance even with a properly matched replacement tire.

A short pre-drive check should also include inflation pressure, visible sidewall condition, tread seating, and any signs of rubbing at the front or rear. On trucks that have sat for long periods, wheel bearings, brakes, and axle hardware deserve attention as well, since a fresh set of tires cannot correct underlying mechanical issues.

Collector-truck tires should be checked regularly for air loss, cracking, cuts, bulges, and uneven tread wear, even if the 1979 Chevrolet C/K Pickup is driven only occasionally. Long periods of storage can be harder on vintage-type tires than steady use, particularly when the truck sits in heat, sunlight, moisture, or near electric motors and other ozone sources.

Keeping the truck clean, properly inflated, and moved periodically can help reduce flat spotting and age-related stress. It is also wise to inspect the spare and confirm that all tires still match the truck's wheel setup, since older pickups sometimes accumulate mixed wheels and tires over time that no longer suit the vehicle as a complete set.