1975 Jeep CJ5 & CJ7 Tires

A 1975 Jeep CJ5 & CJ7 uses three primary tire sizes: F78-15, H78-15, and HR78-15. F78-15 and H78-15 are bias-ply sizes in the vintage alphanumeric system, while HR78-15 is an alphanumeric radial size. All three fitments use a 15-inch rim diameter, so the main difference is the exact size designation and construction.

The correct choice depends on the wheel-and-tire setup actually on the Jeep. Many surviving CJs have been changed over time, so it helps to verify the size on the current tires, confirm the wheel diameter, and decide whether the goal is a traditional bias-ply presentation or a radial-based setup in the proper sizing family.

The applicable tire sizes for a 1975 Jeep CJ5 & CJ7 all use a 15-inch rim diameter. That applies to F78-15, H78-15, and HR78-15, so wheel diameter stays consistent even though the vehicle can use more than one tire size and more than one construction type.

Rim diameter is only the first checkpoint. Wheel width still matters, especially when comparing bias-ply tires with radial equivalents, and older Jeeps are often fitted with replacement wheels. Measuring the wheel and checking the tire's width range before ordering helps avoid choosing a size that matches the diameter but does not suit the rim.

The 1975 Jeep CJ5 & CJ7 Base uses the same family of tire fitments for this application: F78-15, H78-15, and HR78-15. That means the Base sub-model does not introduce a separate wheel diameter or a unique standalone size outside the covered 15-inch fitment range.

Even with shared sub-model fitment, the exact tire still needs to match the Jeep's current setup. A Base model may be carrying different wheels, a previous owner's tire change, or a restoration-driven appearance choice, so checking the actual mounted size and the wheel dimensions remains more useful than assuming every Base Jeep is equipped the same way today.

F78-15 is a bias-ply tire size for the 1975 Jeep CJ5 & CJ7. It uses the vintage alphanumeric bias-ply format, so the letter-and-number code is part of an older sizing system rather than a modern metric radial designation. On this Jeep, it represents a primary bias-ply fitment, not a radial equivalent.

That matters because a bias-ply tire affects both appearance and selection strategy. Buyers usually compare it against period-style replacement goals first, then decide whether to stay with bias-ply construction or investigate one of the available radial equivalents. Wheel width, clearance, and the Jeep's intended use should all be checked before changing construction.

F78-15 has four radial-equivalent options: 195R15, P205/75R15, P215/70R15, and 670R15. H78-15 also has four equivalents: 215R15, P225/75R15, P235/70R15, and 760R15. In each group, the metric and P-metric sizes represent modern radial sizing formats, while 670R15 and 760R15 are bias-look radial alternatives.

These equivalents give different ways to move from vintage bias-ply sizing into radial construction without treating every option as interchangeable. The recommended rim-width range is 5 to 7 inches for F78-15 equivalents and 6 to 8 inches for H78-15 equivalents, so wheel width, overall dimensions, and clearance should be reviewed before making the change.

Either direction can make sense on a 1975 Jeep CJ5 & CJ7, depending on the Jeep's current setup and the result you want. F78-15 and H78-15 are primary bias-ply fitments, while HR78-15 is a primary radial size. Radial equivalents also exist for the bias-ply sizes, including bias-look radial choices.

The decision usually comes down to use and presentation. A restoration-minded Jeep may stay with bias-ply sizing for a more traditional appearance, while a road-driven Jeep may prompt closer interest in radial alternatives. Matching the tire to the wheel, checking clearance, and keeping all four tires consistent in construction are smart steps before committing.

Start with the exact primary size on the Jeep: F78-15, H78-15, or HR78-15. From there, the important factors are construction type, wheel compatibility, and the kind of use the Jeep sees. A traditional bias-ply fitment leads to one set of choices, while a radial setup or radial-equivalent conversion points in another direction.

Appearance matters almost as much as size on a vintage Jeep. Some owners want a clean period-style sidewall, while others want a more utilitarian truck look. It also helps to compare rim-width requirements, maximum load figures where relevant, and whether the tire's overall character suits a restoration, a trail-oriented build, or a casual road driver.

Available H78-15 tires for the 1975 Jeep CJ5 & CJ7 include both wide whitewall and blackwall sidewall styles. The Coker Classic options use a wide whitewall presentation, while the STA Traxion uses a blackwall sidewall with a more work-oriented visual character.

That choice changes the Jeep's personality quickly, even when the size stays the same. A wide whitewall can push the vehicle toward a more restoration-oriented or vintage-styled look, while a blackwall Traxion keeps the focus on utility. Sidewall style should be chosen alongside tread character and intended use, not as an isolated cosmetic decision.

Current H78-15 product choices for the 1975 Jeep CJ5 & CJ7 include Coker Classic and STA. Those brands cover different visual and usage directions, with Coker Classic centered on traditional bias-ply styling and STA represented here by the Traxion series in a blackwall truck-oriented format.

Brand should be treated as one part of the decision rather than the whole decision. The more useful comparison is how each tire aligns with the Jeep's intended look, construction type, and wheel setup. Sidewall treatment, tire series, rim-width compatibility, and load specification can all matter just as much as the name on the sidewall.

A period-style 1975 Jeep CJ5 & CJ7 usually starts with one of the vintage-size bias-ply fitments, such as F78-15 or H78-15. Those sizes preserve the older alphanumeric sizing language and traditional tire construction that many restoration-oriented owners want to see on a mid-1970s Jeep.

The final choice depends on the exact look being pursued. H78-15 options, for example, can lean toward a wide whitewall presentation or a more utilitarian blackwall truck style. For owners chasing strict originality, tire size and construction are the first checkpoints, while brand and sidewall details are best cross-checked against marque-specific historical references.

Tire construction influences both stance and visual character on a restored 1975 Jeep CJ5 & CJ7. Bias-ply tires such as F78-15 and H78-15 keep the vehicle in a more traditional sizing and construction language, while HR78-15 or a radial equivalent can give the Jeep a more modernized replacement path.

That difference matters even before the Jeep moves. Sidewall shape, sizing format, and overall presentation can all look different when changing construction, especially on a short-wheelbase utility vehicle where the tires are a major visual element. Buyers balancing authenticity and drivability often decide on construction first, then narrow the choice by sidewall style and series.

Yes, modifications can change tire fitment on a 1975 Jeep CJ5 & CJ7 even when the nominal tire size looks correct. Aftermarket wheels, different wheel widths, suspension changes, steering alterations, or body modifications can all affect how an F78-15, H78-15, or HR78-15 tire sits and clears the vehicle.

That is especially important with older Jeeps, since many have been changed over the years. A sensible check includes wheel diameter, wheel width, tire-to-fender clearance, and front steering clearance at full lock. Looking at the whole package is more useful than relying on the size code alone when the vehicle no longer matches a stock-style setup.

Before driving a 1975 Jeep CJ5 & CJ7 on new tires, inspect the wheels, lug hardware, valve stems, and overall wheel condition, then confirm the mounted tire size matches the intended setup. It also helps to verify inflation pressure, look for any contact issues at the fenders or steering components, and make sure all four tires are matched appropriately.

A short test drive should be followed by another visual check. Older vehicles can reveal clearance or seating issues only after the tires have seen some movement, especially if the Jeep has replacement wheels or suspension work. Catching rub marks, air loss, or uneven stance early is far easier than dealing with damage later.

Collector-use tires on a 1975 Jeep CJ5 & CJ7 should be kept properly inflated, inspected regularly, and protected from long periods of neglect. F78-15, H78-15, and HR78-15 tires all benefit from routine checks for cracking, bulges, cuts, uneven wear, and slow air loss, especially when the Jeep is driven only occasionally.

Storage conditions matter almost as much as mileage on a vintage Jeep. Keeping the vehicle away from prolonged sunlight, excess heat, moisture, and ozone sources can help preserve tire condition between drives. It is also wise to inspect the tires before any longer outing, since low-use collector vehicles often age their tires long before they wear them out.