1977 Ford F-100 Tires

The 1977 Ford F-100 uses five primary bias-ply tire sizes: G78-15, H78-15, L78-15, 700-15, and 650-16. Most covered configurations use 15-inch sizes, while one 4x2 setup with 360, 390, and 460 engines at 5350 and 5450 GVWR uses 650-16 on a 16-inch rim.

The practical issue is that size varies by drivetrain, GVWR, wheelbase, and certain engine groupings, so there is no single answer for every F-100. Start by confirming the truck’s exact sub-model and the wheel diameter currently on the vehicle, then match the tire size before comparing sidewall style, tread type, or radial-equivalent alternatives.

A 1977 Ford F-100 uses either a 15-inch or 16-inch rim, depending on configuration. G78-15, H78-15, L78-15, and 700-15 are all 15-inch tire sizes, while 650-16 is a 16-inch size tied to one specific 4x2 engine and GVWR combination.

Rim diameter should be checked before anything else because a 15-inch and 16-inch tire are not interchangeable. A truck may also have replacement wheels after decades of use, so reading the current tire size and measuring the wheel where needed helps prevent choosing a period-style tire that belongs to the wrong rim diameter.

The 1977 Ford F-100 covers many working configurations, including 4x2 and 4x4 trucks, different wheelbases, multiple GVWR ranges, Super Cab versions, and some engine-specific setups. That broader spread is why the truck appears with several primary bias-ply sizes instead of one universal fitment.

That variety means the best tire choice starts with identifying the exact truck rather than choosing by appearance alone. Once the sub-model and wheel diameter are confirmed, the field becomes much easier to manage, and the remaining decision usually comes down to the correct size family, sidewall style, and whether a truck-oriented tread is appropriate.

G78-15 is a primary bias-ply tire size for certain 1977 Ford F-100 configurations. It is part of the vintage alphanumeric bias-ply system and belongs to the truck’s original-style fitment family rather than being a radial size in its primary form.

That matters because a buyer deciding between traditional construction and a radial alternative should keep the two choices separate. G78-15 preserves the classic bias-ply format, while radial equivalents are a different path that should be checked against wheel width, overall dimensions, and clearance before making a change.

G78-15 has radial equivalents in 205R15, P215/75R15, P225/70R15, and 710R15. H78-15 can be compared with 215R15, P225/75R15, P235/70R15, and 760R15, while L78-15 corresponds to 235R15, P235/75R15, P255/70R15, and 820R15. In each group, the first is an 80-series metric radial, the next two are P-metric 75- and 70-series radials, and the last is a bias-look radial.

Those options give the owner several ways to move from a vintage bias-ply size into a modern radial format without using the same sizing convention. The recommended rim-width range is 6 to 8 inches for these equivalents, but wheel compatibility, truck stance, and clearance around steering and suspension should still be verified carefully.

Begin with the truck’s exact primary size and wheel diameter, then compare the available radial equivalent for that size rather than guessing across the range. On this F-100, radial equivalents are tied to the 15-inch G78-15, H78-15, and L78-15 fitments, and each should stay within the appropriate 15-inch wheel family.

The next checks are wheel width, actual wheel condition, and clearance at the fenders, steering, and suspension through the full range of movement. It also helps to consider how the truck is used, since a restoration-minded build may favor the original bias-ply appearance while a road-driven truck may lead the owner to compare radial alternatives more closely.

Start with the truck’s exact sub-model, then confirm the correct size and rim diameter before comparing anything else. A 1977 Ford F-100 may use G78-15, H78-15, L78-15, 700-15, or 650-16, all in bias-ply form, so the first choice is fitment rather than brand or appearance.

After that, compare the details that change how the truck looks and how the tire is presented: blackwall versus whitewall, passenger-style versus truck-oriented series, and rim-width compatibility where it is stated. A buyer restoring a period-style truck may focus on sidewall presentation, while a utility-minded owner may concentrate on tread character and load-related specifications.

Available sidewall styles for the 1977 Ford F-100 include blackwall, wide whitewall, narrow whitewall, and dual-white-stripe, depending on size. The widest appearance spread shows up in L78-15, while other sizes such as G78-15, H78-15, 700-15, and 650-16 also offer a mix of blackwall and whitewall choices.

That sidewall variety lets the tire shape the truck’s presentation as much as the wheel itself. Blackwalls tend to suit work-truck or utility-oriented builds, while whitewall styles can push the truck toward a more restoration-focused look. The important step is choosing the correct size first, then narrowing the field by sidewall style within that fitment.

Tires for the 1977 Ford F-100 are available from Coker Classic, STA, BFGoodrich, Firestone, Garfield, Excelsior, Lester, Goodyear, and Tornel, depending on size. Brand spread is especially broad in 650-16, while the 15-inch sizes also offer multiple choices across classic and truck-oriented bias-ply lines.

Brand matters most after the right size has been established, because not every brand appears in every fitment. Once the truck’s tire size is confirmed, compare the brands by sidewall treatment, tire series, rim-width specification, and the overall look you want, rather than assuming the same brand offers the same type of tire in every size.

A period-style 1977 Ford F-100 usually starts with the correct primary bias-ply size for the truck’s exact configuration. From there, the available choices range from simple blackwalls to whitewall treatments and truck-oriented tread designs, depending on whether the truck is being presented as a working pickup, a cleaner road truck, or a more restoration-focused build.

The most convincing result comes from matching size, rim diameter, and visual character rather than choosing by sidewall alone. If exact historical originality matters beyond a general period-style appearance, it is wise to compare the tire choice against marque-specific references, surviving original examples, or restoration documentation for that particular F-100 configuration.

On a restored 1977 Ford F-100, bias-ply construction preserves the truck’s original-style sizing language and traditional visual character. That matters here because all five primary fitments are bias-ply, so staying with the original construction family keeps the truck in the same general period presentation that many collectors expect.

A radial alternative can still be considered on certain 15-inch sizes, but it changes the route taken to get there. Some owners prefer that tradeoff for road use, while others want the look and stance associated with bias-ply tires. The better choice depends on whether appearance or modernization carries more weight for the finished truck.

Yes, modifications can affect tire fitment on a 1977 Ford F-100, even when the selected tire is one of the proper vintage sizes for that sub-model. Aftermarket wheels, altered wheel width, suspension changes, ride-height changes, and brake conversions can all change the space available around the tire.

That is especially important on a truck with multiple possible factory size families and both 15-inch and 16-inch rim usage across the model range. A modified F-100 should be checked at full steering lock and through suspension movement so the chosen tire works with the truck as it sits now, not just as it was originally configured.

Before driving a 1977 Ford F-100 on new tires, inspect the wheels for correct diameter and condition, confirm that the tires are mounted in the correct size, and check inflation, valve stems, and lug hardware. It also helps to verify that the tires clear the fenders, steering components, and suspension without rubbing.

An older truck deserves a broader walkaround before road use, especially if it has been stored or only driven occasionally. Look over the steering and suspension for looseness, inspect for air loss after mounting, and recheck the tires after the first short drive. Early inspection catches setup issues before they become wear or clearance problems.

Tires on a collector 1977 Ford F-100 should be kept properly inflated, inspected regularly for cracking, cuts, bulges, and uneven wear, and checked for slow air loss during storage. A truck that sees limited mileage can still age its tires, so condition matters just as much as tread depth.

Storage habits also influence how well the tires hold up over time. Keeping the truck away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve both blackwall and whitewall tires. Periodic movement, visual inspections, and pressure checks before each outing go a long way toward avoiding surprises on an older collector pickup.