1978 Jeep CJ6 Tires

The 1978 Jeep CJ6 uses three primary bias-ply tire sizes: 600-16, F78-15, and H78-15. Those sizes are not all on the same wheel diameter, since 600-16 is a 16-inch fitment while F78-15 and H78-15 are 15-inch fitments.

That means the right choice starts with the wheels actually on the Jeep, not just the model name. A CJ6 that has been restored, modified, or converted between 15-inch and 16-inch wheels should be checked carefully before selecting tires, because the correct size depends on the rim diameter and the overall setup already on the vehicle.

A 1978 Jeep CJ6 can use either a 16-inch rim or a 15-inch rim, depending on which tire size is on the vehicle. The 600-16 tire fits a 16-inch rim, while F78-15 and H78-15 both fit 15-inch rims.

That dual-rim situation is why wheel confirmation is so important on this Jeep. Counting on the sidewall size alone is fine when the existing tires are known to be correct, but older Jeeps often change hands with different wheels, so measuring the wheel and checking width before ordering helps prevent a mismatch between tire size and rim.

The 600-16 size is a numeric bias-ply designation. In plain terms, the 600 indicates an approximate 6.00-inch nominal section width, and the 16 means the tire is built for a 16-inch rim.

That sizing system is older than modern metric radial formats, so it can look unfamiliar at first glance. On a 1978 Jeep CJ6, 600-16 points you toward a traditional bias-ply tire on 16-inch wheels, often with choices ranging from plain blackwall styles to military and truck-oriented tread designs depending on the look and use you want.

F78-15 is a bias-ply primary fitment for the 1978 Jeep CJ6. It uses the vintage alphanumeric sizing system rather than a modern radial metric format, so the original-style fitment is a 15-inch bias-ply tire.

That distinction matters because a radial in a comparable size is considered an alternative, not the same construction. Owners who want the traditional look and feel usually stay with bias-ply, while owners exploring radial options should compare wheel width, overall dimensions, and clearance before changing away from the original-style construction.

F78-15 radial equivalents include 195R15, P205/75R15, P215/70R15, and 670R15. H78-15 radial equivalents include 215R15, P225/75R15, P235/70R15, and 760R15, covering 80-series metric, 75-series P-metric, 70-series P-metric, and bias-look radial formats.

Those choices give a 15-inch CJ6 owner several ways to approach a radial conversion, from a conventional metric radial to a bias-look radial that keeps a more traditional presentation. Rim-width guidance is part of the equation too, so it helps to compare the wheel, the tire dimensions, and the Jeep’s available clearance before settling on one equivalent.

Start by confirming that the Jeep is using one of the 15-inch sizes with listed radial equivalents, because 600-16 does not have an equivalent shown here. For F78-15 and H78-15, verify the wheel diameter first, then compare the wheel width to the recommended rim-width range tied to the radial size being considered.

A conversion also deserves a close look at steering travel, fender clearance, suspension condition, and how the Jeep is actually used. A CJ6 with aftermarket wheels, a lift, or different springs may have different clearance behavior than a stock-height example, so the equivalent size should be evaluated against the vehicle’s real-world setup rather than assumed interchangeable.

The first decision is wheel diameter, since a 1978 Jeep CJ6 can use either 600-16 on a 16-inch rim or F78-15 and H78-15 on 15-inch rims. After that, the main factors are construction, intended appearance, and whether the Jeep is being set up with a civilian-style road look or a more utilitarian truck or military-style presentation.

Product differences also matter once the size is narrowed down. Sidewall treatment, tire series, rim-width suitability, weight, and load figures can all influence the final choice, especially on a vehicle that may see both collector use and light-duty driving, so comparing those details helps match the tire to the Jeep’s actual purpose.

1978 Jeep CJ6 tires are available in several sidewall styles, including blackwall, wide whitewall, and double-whitewall depending on size and series. Most 600-16 options are blackwall, but that size also includes whitewall and double-whitewall choices, while H78-15 includes both blackwall and wide whitewall versions.

The sidewall treatment changes the overall character of the Jeep more than many owners expect. Blackwall suits a more functional or truck-like appearance, while whitewall options create a more stylized vintage presentation, so the best choice usually depends on whether the CJ6 is being restored for traditional utility, period flair, or general collector-road use.

Available brands for the 1978 Jeep CJ6 include BFGoodrich, Coker Classic, Avon, Firestone, Ford Script, Excelsior, Lester, Goodyear, STA, and Camac. The widest assortment appears in 600-16, while H78-15 has a smaller group of choices.

Brand is only one part of the decision on a vintage Jeep. It also helps to compare the tire series, sidewall style, tread character, and wheel-width suitability within the correct size, since one brand may offer a more restoration-oriented look while another may better match a military or utility-focused build without changing the basic fitment.

A period-style 1978 Jeep CJ6 starts with one of its primary bias-ply sizes: 600-16, F78-15, or H78-15, depending on the wheels on the Jeep. From there, the visual direction can range from simple blackwall bias-ply tires to whitewall versions or military and truck-style tread patterns in 600-16.

The most convincing choice usually comes from matching the tire to the Jeep’s intended presentation rather than chasing one universal answer. A utility-focused restoration may lean toward blackwall or military-style tread, while a more stylized build may favor whitewalls, and exact originality should be checked against vehicle-specific historical references when that level of detail matters.

Tire construction changes both the look and personality of a restored 1978 Jeep CJ6. The primary fitments are bias-ply sizes, which preserve a more traditional vintage Jeep appearance, especially when paired with period-style sidewalls and tread patterns.

A radial equivalent on a 15-inch setup can change the visual impression even before the Jeep moves, particularly if the owner chooses a modern metric or P-metric format instead of a bias-look radial. For a restoration-minded project, that makes construction choice part of the appearance decision as much as the driving decision.

Yes, modifications can affect tire fitment on a 1978 Jeep CJ6 even when the tire size itself is correct. Different wheels, altered wheel width, offset changes, suspension lifts, spring changes, and body modifications can all influence how a 600-16, F78-15, or H78-15 tire sits and clears.

That is especially important on older Jeeps because many have been changed over time. A CJ6 with aftermarket wheels or a non-stock stance should be checked at full steering lock and through suspension movement, since a size that suits one setup may need extra clearance verification on another.

Before driving a 1978 Jeep CJ6 on new tires, inspect the wheels for correct diameter and sound condition, then confirm the tires are seated properly and inflated appropriately for the application. It also helps to check valve stems, lug hardware, and basic wheel balance before putting miles on the Jeep.

The vehicle itself deserves attention too, especially on a collector-era 4x4. Steering components, suspension condition, brake operation, and available fender and frame clearance should all be looked over, because a new set of tires performs best when the rest of the Jeep is equally ready for road use.

Collector-vehicle tire care starts with regular inspection, even if the 1978 Jeep CJ6 is driven only occasionally. Check for air loss, uneven wear, sidewall cracking, bulges, cuts, and tread condition on 600-16, F78-15, or H78-15 tires, and keep the Jeep stored away from prolonged sunlight, moisture, and ozone sources when possible.

Low-use vehicles can develop tire issues simply from age and storage, not mileage. Periodic pressure checks, occasional movement to avoid long-term flat spotting, and a fresh look before any highway or trail outing help catch problems early and keep a vintage CJ6 safer and more predictable on the road.