1979 Jeep CJ5 & CJ7 Tires

A 1979 Jeep CJ5 & CJ7 can use three primary 15-inch tire sizes: 225/75R15 in radial construction, plus G78-15 and L78-15 in bias-ply construction. Those are not just different labels for the same tire. They represent different sizing systems and, in practice, different tire-selection paths for an owner deciding between modern radial fitment and traditional bias-ply fitment.

The next step is confirming which size is already on the Jeep and whether the wheels match that setup. A CJ that has been modified over the years may not still have its earlier wheel-and-tire combination, so checking the actual wheel width, overall tire clearance, and the look you want is more useful than choosing by year alone.

The primary tire sizes used on a 1979 Jeep CJ5 & CJ7 all mount on a 15-inch rim. That applies to the radial 225/75R15 as well as the vintage bias-ply G78-15 and L78-15 sizes. Even though the constructions and sizing formats differ, the wheel diameter remains the same across these fitment choices.

Rim diameter is only part of the fitment picture, so it is smart to confirm wheel width before choosing a specific tire. The available products in these sizes do not all share the same width range, and a Jeep with replacement wheels, utility-oriented tires, or long-ago suspension changes may need a closer fitment check before a new set is selected.

The covered 1979 Jeep CJ5 & CJ7 Standard Models share the same three primary size choices: 225/75R15, G78-15, and L78-15. That means the sub-model grouping does not split into different fitments here. The real variation comes from which of those three sizes the Jeep is wearing or is being returned to.

That shared fitment makes the selection process simpler, but it does not eliminate the need to inspect the vehicle. A CJ that now has different wheels, a lift, or a body setup intended for off-road use may point you toward one of the listed sizes more naturally than another, especially when appearance and construction type matter.

G78-15 is a bias-ply tire size for the 1979 Jeep CJ5 & CJ7. It uses the older alphanumeric sizing system rather than modern metric radial sizing, and it is one of the traditional 15-inch fitment choices for this vehicle. Available G78-15 products include whitewall and blackwall options, depending on the kind of presentation you want.

Choosing G78-15 usually means keeping a more vintage tire construction and appearance. That can be appealing on a restoration-minded Jeep, but it is still important to confirm that the wheel width suits the tire and that the vehicle's actual wheel-and-suspension setup has not changed since the bias-ply size was last installed.

For G78-15, the radial equivalents are 205R15, P215/75R15, P225/70R15, and the bias-look radial 710R15. For L78-15, the radial equivalents are 235R15, P235/75R15, P255/70R15, and the bias-look radial 820R15. Each group includes an 80-series metric radial, a 75-series P-metric radial, a 70-series P-metric radial, and a radial option intended to keep a more traditional visual character.

Those equivalent sizes are useful alternatives, but they should be treated as fitment comparisons rather than automatic substitutions. The recommended rim-width range attached to both bias-ply equivalent groups is 6-8 inches, and the actual decision should still include wheel width, clearance at full steering travel, and the Jeep's intended on-road or utility use.

That depends on how the Jeep is being used and what kind of look you want to preserve. The 1979 Jeep CJ5 & CJ7 supports both directions within its primary fitment choices, with 225/75R15 as a radial size and G78-15 or L78-15 as bias-ply sizes. Bias-ply keeps the earlier sizing system and traditional presentation, while the radial option follows a more modern tire format.

Owners focused on a period-style restoration often start by considering the bias-ply sizes, while a regularly driven Jeep may lead you toward the radial format. Either way, the best approach is to match the tire to the wheel dimensions already on the vehicle and verify that any construction change still works with the Jeep's current stance and clearance.

Start with the correct primary size for the Jeep's current setup, then narrow the choice by construction, sidewall style, and how the vehicle is actually used. On this Jeep, that means deciding between the radial 225/75R15 and the bias-ply G78-15 or L78-15 sizes. Within those sizes, available tires vary by brand, tire series, rim-width range, and whether the appearance is blackwall, narrow whitewall, wide whitewall, or dual-white-stripe.

A restoration-minded owner may prioritize a more traditional sidewall and sizing format, while a Jeep used more often on the road may point toward the radial size. Utility-oriented tread choices are also present in some bias-ply sizes, so checking the wheel dimensions and thinking honestly about the Jeep's intended role helps narrow the field quickly.

The 1979 Jeep CJ5 & CJ7 has a surprisingly broad range of sidewall choices across its available tires. Depending on size, those include blackwall, narrow whitewall, wide whitewall, and dual-white-stripe styles. The radial 225/75R15 options lean toward whitewall presentations, while the bias-ply G78-15 and L78-15 sizes include both whitewall versions and blackwall choices, especially in the truck-oriented offerings.

That gives you room to shape the Jeep's look without changing the basic wheel diameter. A whitewall can push the vehicle toward a more restoration-oriented or dressed appearance, while blackwall choices usually feel more utilitarian. The best visual match depends on the character of the Jeep and whether you want a road-focused, traditional, or workhorse presentation.

Tires for the 1979 Jeep CJ5 & CJ7 are available from BFGoodrich, Coker Classic, American Classic, Maxxis, STA, and Travelstar. Those brands appear across the Jeep's radial and bias-ply size choices rather than being confined to a single construction style. Some sizes also include distinct tire series that help separate restoration-style whitewall options from more utility- or truck-oriented designs.

Brand alone should not drive the decision. It is more useful to compare the actual size you need, the construction type, the sidewall treatment you want to see on the vehicle, and the wheel-width range that matches your rim. Once those fitment and appearance points are settled, the brand list becomes easier to evaluate in a practical way.

A period-style 1979 Jeep CJ5 & CJ7 usually starts with one of the bias-ply sizes, G78-15 or L78-15, because those retain the older alphanumeric format and traditional construction. Within those sizes, available choices include blackwall, whitewall, and even truck-oriented tread styles. That gives you flexibility to build a Jeep that looks more road-oriented, more utility-focused, or more in line with a broad late-1970s presentation.

The right choice depends on how faithfully you want to follow the Jeep's earlier visual character and what wheel setup is on the vehicle now. If exact originality matters, compare your tire choice against marque-club references, period photos, or build-specific documentation rather than relying on size alone to settle the appearance question.

Tire construction changes the visual character of a restored 1979 Jeep CJ5 & CJ7 more than many owners expect. The bias-ply G78-15 and L78-15 sizes carry the older alphanumeric format and a more traditional look, while the radial 225/75R15 presents the Jeep in a more modern sizing language. Sidewall style also shapes the result, especially where blackwall and whitewall options overlap.

That means appearance is not just about choosing a 15-inch tire that mounts on the wheel. A Jeep restored for traditional presentation often looks most cohesive when the size format, construction, and sidewall treatment all support the same visual direction. The best result usually comes from deciding on the Jeep's finished character before comparing individual product options.

Yes. Modifications can change how a 1979 Jeep CJ5 & CJ7 accepts any of its primary tire sizes, even though all three fitment choices use a 15-inch rim. Aftermarket wheels, different wheel widths, suspension lifts, altered springs, or body changes can all influence how a 225/75R15, G78-15, or L78-15 tire sits in the wheel opening and clears at steering lock.

That is especially important on older Jeeps, because many have been changed over time for trail use or appearance. Measuring the actual wheel width and inspecting clearance at the fender, suspension, and steering components is a better approach than assuming every surviving CJ still matches its earlier wheel-and-tire setup.

Before driving a 1979 Jeep CJ5 & CJ7 on new tires, inspect the wheels for the correct 15-inch diameter and suitable width, then confirm the tires seat and clear properly. It is also smart to look at valve stems, wheel condition, and basic suspension and steering health. On an older Jeep, those supporting parts matter just as much as the tire itself.

A short road test should include checking inflation pressure, listening for rubbing, and making sure the steering moves lock to lock without interference. Older collector or utility vehicles also benefit from a close look at alignment feel, brake response, and any sign of air loss after installation so small fitment issues are caught early.

Tires on a collector 1979 Jeep CJ5 & CJ7 should be inspected regularly for cracking, cuts, bulges, uneven tread wear, and gradual air loss, even if the Jeep is driven only occasionally. Low-mileage collector use can hide aging issues that are easy to miss at a glance. Tire pressure should be checked before road use rather than assumed from the last drive.

Storage conditions also matter. Keeping the Jeep away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve both radial and bias-ply tires. A CJ that sits for long periods benefits from more frequent condition checks, because time and environment can age a tire long before tread depth becomes the limiting factor.