1974 Jeep CJ5 Tires

The 1974 Jeep CJ5 uses three primary bias-ply tire sizes: E78-15, F78-15, and H78-15. All three are vintage alphanumeric sizes built for 15-inch rims, so the main fitment question is not wheel diameter but which of those three sizes matches the Jeep's current setup.

A CJ5 that has been restored, modified, or simply fitted with different wheels over time may no longer match another vehicle of the same year. Checking the size stamped on the existing tire, confirming wheel width, and looking at fender and steering clearance will help narrow the correct replacement path before choosing a bias-ply tire or considering a radial equivalent.

The primary tire sizes for a 1974 Jeep CJ5 all use a 15-inch rim diameter. That applies across E78-15, F78-15, and H78-15, so the final number in each size code points to the same wheel diameter even though the tires differ in overall size class.

Rim diameter is only part of the fitment picture on an older Jeep. Width still matters, especially if the vehicle has aftermarket wheels or if a radial equivalent is being considered instead of a bias-ply tire. Verifying both the 15-inch diameter and the actual wheel width helps avoid clearance and compatibility issues before mounting new tires.

These are vintage alphanumeric bias-ply tire sizes. The letter identifies the tire's general size class, the 78 refers to the profile family used in this older sizing system, and the 15 indicates the wheel diameter in inches.

For a 1974 Jeep CJ5, that means the letter is the part that most clearly separates the available primary sizes. An E78-15, F78-15, and H78-15 all mount on 15-inch rims, but they are not the same overall fitment choice. Matching the full size code matters before comparing appearance, product style, or any radial-equivalent alternative.

E78-15, F78-15, and H78-15 are primary bias-ply tire sizes for the 1974 Jeep CJ5. They use the older alphanumeric sizing system and represent the traditional construction associated with this vehicle's covered fitments rather than a primary radial specification.

That distinction matters because a bias-ply tire affects both look and replacement strategy. Owners who want to keep the Jeep in a traditional format can stay within the original construction, while owners exploring radial alternatives should compare wheel width, overall tire dimensions, and clearance carefully instead of assuming that any modern-looking equivalent will suit the existing setup.

Radial equivalents for F78-15 include 195R15 as an 80-series metric radial, P205/75R15 as a 75-series P-metric radial, P215/70R15 as a 70-series P-metric radial, and 670R15 as a bias-look radial. This equivalent group also carries a recommended rim-width range of 5 to 7 inches.

Those options give a 1974 Jeep CJ5 owner several ways to move from a vintage alphanumeric bias-ply size into more modern radial sizing conventions. The choices are not automatically interchangeable on every Jeep, so the wheel width, tire-to-body clearance, and overall setup should be reviewed before converting from the original construction.

Start by matching the original CJ5 tire size to its actual radial equivalent options. For example, E78-15, F78-15, and H78-15 each have specific metric or P-metric radial alternatives, and some sizes also include a bias-look radial intended to retain a more traditional visual style.

The practical checks are wheel width, wheel diameter, tire clearance at the fender and steering stops, and the vehicle's overall condition if suspension parts have changed over time. A Jeep that still has stock-type wheels may accept a different alternative than one with aftermarket rims, so conversion should be approached as a full fitment review rather than a size-code swap.

Start with the correct primary size: E78-15, F78-15, or H78-15 on a 15-inch rim. From there, the key choices are whether to stay with bias-ply construction, whether a radial equivalent better suits the Jeep's intended use, and whether the final look should be traditional, utilitarian, or more restoration-oriented.

Product-level differences matter most once size is confirmed. Owners should compare sidewall treatment, tire series, rim-width compatibility, and load figures where available, especially if the Jeep sees mixed use. A CJ5 built for visual authenticity may point in a different direction than one meant for regular road miles or a truck-style presentation.

Available 1974 Jeep CJ5 products in H78-15 include both wide whitewall and blackwall sidewall styles. The wide whitewall choices appear in the Coker Classic Bias Ply line, while the blackwall option appears in the STA Traxion series.

That gives the Jeep owner a clear appearance decision once the H78-15 size is confirmed. A wide whitewall pushes the vehicle toward a more restoration-minded or vintage street presentation, while a blackwall truck-style tire creates a more workmanlike look. Sidewall style should be chosen after size and wheel compatibility are settled, not as the first fitment decision.

Current product choices for the 1974 Jeep CJ5 include Coker Classic and STA in H78-15 bias-ply form. Those brands represent two different visual and usage directions within the same primary size, rather than simply repeating the same tire under different names.

Coker Classic centers the H78-15 choices around wide whitewall presentation, while STA brings a blackwall Traxion tire with a military and truck character. The better comparison is brand plus sidewall style plus tire series, since those factors shape how the finished Jeep looks and how closely the tire matches the owner's intended use.

A period-style 1974 Jeep CJ5 usually starts with one of its original-format bias-ply sizes: E78-15, F78-15, or H78-15, depending on the Jeep's actual setup. Staying with bias-ply construction preserves the older sizing format and helps maintain the kind of tire presentation many vintage Jeep owners want.

After size is confirmed, appearance becomes the next filter. An H78-15 owner can compare wide whitewall and blackwall styles, which lead the Jeep in very different visual directions. For an exact restoration, tire choice should also be checked against marque-specific historical references, since a period-style tire is not automatically proof of factory-original appearance.

On a restored 1974 Jeep CJ5, bias-ply construction tends to preserve the vehicle's vintage sizing language and traditional tire character. That matters because E78-15, F78-15, and H78-15 are all original-format bias-ply fitments, so remaining in that construction keeps the Jeep visually tied to its era.

A radial equivalent can still be worth considering, especially when a bias-look radial is available for a given size, but the visual result may differ from a traditional bias-ply tire. Owners balancing restoration goals with road use should think about the finished stance, sidewall treatment, and wheel setup before deciding which construction best suits the project.

Yes, modifications can change what works on a 1974 Jeep CJ5 even when the tire still mounts on a 15-inch rim. Aftermarket wheels, suspension lifts, different springs, steering changes, or body alterations can all influence whether an E78-15, F78-15, H78-15, or radial equivalent clears properly.

That is why an older Jeep should be checked as it sits rather than judged only by year and model. Looking at wheel width, backspacing or offset if known, turning clearance, and fender space will help catch issues before mounting new tires. Those checks become even more important when moving away from the original bias-ply construction.

Before road use, inspect wheel condition, valve stems, lug hardware, and the Jeep's basic alignment and suspension health. On the tires themselves, look for proper inflation, bead seating, and any signs of rubbing once the steering is turned through its full range.

A short, careful shakedown drive is worthwhile on any vintage CJ5. Pay attention to pull, vibration, unusual noise, or contact at the springs, fenders, or steering components. Older vehicles often have wear or past modifications that affect tire behavior, so those first miles should be treated as a fitment and condition check rather than routine driving.

Collector-vehicle tires on a 1974 Jeep CJ5 should be inspected regularly for cracking, cuts, bulges, uneven wear, and gradual air loss, even if the Jeep is driven only occasionally. Low annual mileage does not prevent aging, and vintage vehicles often spend long periods parked between uses.

Storage conditions matter just as much as miles. Keeping the Jeep away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve the tires, while maintaining correct inflation reduces flat spotting during long sits. It also helps to review tire condition before every longer outing instead of assuming a stored CJ5 is road-ready.