1974 Jeep Truck Tire Fitment Guide

1974 Jeep Truck vehicles use seven bias-ply sizes: 700-15, G78-15, H78-15, 750-16, 800-16.5, 875-16.5, and 950-16.5. All of them apply to the Truck model core, but they do not share one common rim diameter. The 700-15, G78-15, and H78-15 sizes mount on 15-inch rims, 750-16 mounts on a 16-inch rim, and the 800-16.5, 875-16.5, and 950-16.5 sizes mount on 16.5-inch rims. Rim width guidance also varies by size where it is stated, from 5.00-5.50 inches on 700-15 up to 6.50-6.75 inches on 950-16.5.

That means the real fitment question for a 1974 Jeep Truck is not simply which tire looks right, but which wheel diameter is on the truck now or belongs there for your restoration plan. Once the wheel is confirmed, the remaining choices become much easier to sort by size family, sidewall appearance, and intended use. If your truck has changed wheels over the years, verify the actual rim before ordering rather than assuming every 1974 Jeep pickup used the same tire.

G78-15 is an alphanumeric bias-ply tire size used on some 1974 Jeep Truck applications with 15-inch wheels. In that older sizing system, the letter-and-number combination identifies the tire’s general size class, while the final 15 is the wheel diameter in inches. It is not a modern metric radial size, and it does not decode the same way as a P-metric tire. For 1974 Jeep Truck fitments, G78-15 remains firmly in the period bias-ply category.

For a buyer, that matters because G78-15 should be compared with other 15-inch vintage sizes, not with 16-inch or 16.5-inch truck tires. It also helps explain why the tire options split between classic whitewall designs and more utilitarian blackwall truck patterns. If your sidewall or original literature calls for G78-15, stay within that sizing family unless you are intentionally reworking the wheel and tire package with guidance from a Jeep specialist.

700-15 and 750-16 are older numeric bias-ply sizes used on 1974 Jeep Truck vehicles. In this format, the leading number refers to nominal section width, and the last number gives the rim diameter in inches. A 700-15 fits a 15-inch wheel, while a 750-16 fits a 16-inch wheel. These are vintage sizing conventions, so they should be read as classic bias-ply truck or passenger-truck dimensions rather than as direct modern metric equivalents.

That distinction helps when you are comparing products for a 1974 Jeep Truck because two numeric sizes may both look traditional but still require entirely different wheels. It also explains why one truck may wear a 15-inch bias-ply with whitewalls while another uses a 16-inch blackwall truck tire and still be correct for the year. Always match the numeric size to the wheel diameter on the truck before comparing brand or sidewall options.

1974 Jeep Truck tires are available in both blackwall and wide whitewall form, but the style depends heavily on size. The 700-15, G78-15, H78-15, and 750-16 sizes all offer some whitewall choices alongside blackwall options, while the 16.5-inch sizes focus on blackwall truck tires. That split reflects the fact that some full-size Jeep pickups were trimmed and presented more like dual-purpose personal trucks, while others leaned squarely into commercial or utility work.

If your 1974 Jeep Truck is being restored as a more upscale or period-styled pickup, a whitewall-capable 15-inch or 16-inch size may be the visual direction you want. If the truck is meant to look like a working J-series or to preserve a more rugged stance, blackwall truck tires are the more natural fit. Sidewall style will not overcome a wheel-diameter mismatch, so settle the wheel first and then choose the look that matches the truck’s intended personality.

1974 Jeep Truck tires come from Firestone, BFGoodrich, Coker Classic, Lester, and STA, depending on size. The 700-15 range includes Firestone, BFGoodrich, and STA; G78-15 and H78-15 include Coker Classic and STA; 750-16 includes Firestone, Lester, and BFGoodrich; and the 16.5-inch sizes center on STA truck tires. That gives the 1974 Jeep Truck owner a mix of classic-style passenger-oriented brands and more utility-focused truck lines.

Brand choice on a 1974 Jeep Truck usually follows the type of restoration or driving impression you want to create. Firestone, BFGoodrich, Coker Classic, and Lester tend to align more naturally with traditional vintage appearance, especially where whitewalls are part of the picture, while STA covers the truck side of the spectrum strongly in blackwall form. Once your wheel diameter and size are confirmed, brand becomes a meaningful way to refine the truck’s final look and character.

On 1974 Jeep Truck applications, STA Traxion and STA Super Transport appear together in 800-16.5 and 950-16.5 sizing. Both are bias-ply blackwall truck tires, but they belong to different series and carry slightly different product weights where those figures are stated. In 950-16.5, both reach 2780 pounds at 60 psi, while the Super Transport is heavier at 41 pounds compared with 40 pounds for the Traxion. In 800-16.5, the Super Transport carries a 2045-pound rating at 60 psi, while the Traxion version is presented more as a rugged truck-pattern alternative.

For a 1974 Jeep Truck owner, the practical difference is less about wheel fit and more about tread character and use emphasis within the same 16.5-inch size family. If you are trying to preserve a more utilitarian truck look, both series stay within that vintage bias-ply lane, but they are not visually or functionally interchangeable just because the size matches. Compare the exact series name on the tire you want with the truck’s intended use before making a final selection.

Rim width requirements for 1974 Jeep Truck tires vary by size. The 700-15 uses 5.00-5.50-inch rims, G78-15 uses 5.00-7.00-inch rims, H78-15 uses 5.50-7.00-inch rims, 750-16 uses 5.00-6.00-inch rims, 800-16.5 uses 6.00-6.50-inch rims, and 950-16.5 uses 6.50-6.75-inch rims. Those ranges are not interchangeable across the whole year, even when two tires may appear close in overall vintage style.

That is why a 1974 Jeep Truck owner should confirm both wheel diameter and wheel width before settling on a tire size. A tire that mounts to the correct diameter can still be a poor match if the wheel is outside the intended width range. If your truck has aftermarket or later replacement wheels, measure the wheel rather than relying on appearance alone, especially when moving between the narrower 15-inch sizes and the larger 16.5-inch truck fitments.

Original 1974 Jeep Truck wheels cannot be assumed to work with all seven tire sizes because the sizes span three different rim diameters: 15, 16, and 16.5 inches. A 700-15, G78-15, or H78-15 requires a 15-inch wheel, a 750-16 requires a 16-inch wheel, and the 800-16.5, 875-16.5, and 950-16.5 sizes require 16.5-inch wheels. That diameter difference alone prevents simple interchange across the whole range.

For a 1974 Jeep Truck that has been in service for decades, wheel swaps are common, so the smartest move is to inspect the stampings or measure the wheels before choosing tires. Once diameter is confirmed, then check whether the wheel width falls inside the acceptable range for the exact size you want. Treat originality and current configuration as two separate questions, because the truck may no longer be wearing the same wheel type it left the factory with.

A 1974 Jeep Truck should be stored in a cool, dry space away from direct sunlight, electric motors, welders, furnaces, and other ozone-producing equipment that can age rubber more quickly. Keep the tires properly inflated, clean off mud or chemical residue, and move the truck periodically so one section of the tread does not bear the load for months at a time. Because every tire used here is bias-ply, temporary flat-spotting after storage is more common than with later radial constructions.

If your 1974 Jeep Truck will sit for a full season, many collectors either roll it a short distance every few weeks or support it in a way that reduces long-term weight on the tires while keeping the suspension in mind. A breathable indoor cover helps the truck overall, but tire preservation still depends most on controlling light, heat, moisture, and ozone. Good storage habits do more for long-term sidewall life than occasional driving alone.

Tires on a 1974 Jeep Truck should be judged more by age and condition than by mileage, since collector trucks often see limited annual use. A sensible rule is to begin evaluating them closely once they are about five to seven years old and to treat around ten years as the point where replacement deserves serious consideration regardless of tread depth. The DOT date code on the tire tells you when it was made, and visible cracking, hardening, or persistent air loss can shorten the safe service window.

That approach is especially important on a 1974 Jeep Truck because a bias-ply tire can still look substantial while aging internally. A truck that only attends shows or local events may wear very little tread, but time, storage conditions, and inflation history still matter. If the age is unclear or the tires have spent years parked outdoors or under load, replacement becomes a maintenance decision rather than a mileage decision.

Tires on a 1974 Jeep Truck should be inspected before every drive, with a more deliberate check before any extended outing or highway trip. Look for sidewall cracking, cuts, bulges, uneven wear, embedded debris, and any sign that the tread or casing has been stressed by age or underinflation. Pressure should be checked with a reliable gauge, and the spare deserves the same attention as the four tires on the ground.

A 1974 Jeep Truck can sit long enough between drives that problems develop quietly, especially if the truck is stored in a hot garage or outside through seasonal changes. A quick walk-around is not enough before a longer run; inspect the inner sidewalls as well if access allows. Making tire inspection part of your pre-drive ritual is one of the easiest ways to catch age-related issues before they become a roadside problem.

A 1974 Jeep Truck Truck would originally have been fitted with bias-ply tires, which aligns with every size used across this year’s truck range. The exact original size depended on how the truck was equipped, with 15-inch, 16-inch, and 16.5-inch applications all appearing in the model line. Whitewall and blackwall appearance could also vary depending on how the truck was positioned and ordered. Bias-ply construction is the key historical constant for authenticity on this year and make.

If originality matters for your 1974 Jeep Truck, start by confirming the wheel diameter and any surviving factory paperwork or period photos tied to your exact truck. Then compare those clues with the correct size family rather than chasing a single one-size-fits-all answer. For market-specific, package-specific, or judging-level confirmation, a Jeep marque club or full-size Jeep specialist is the right final authority.

Correct tire fitment matters on a 1974 Jeep Truck because show judging often pays close attention to size, construction, and sidewall presentation. A truck restored for authenticity should stay within the proper wheel-diameter family and should use bias-ply construction to match the period. Sidewall style also affects the result, since a blackwall work-truck look and a wide whitewall presentation communicate very different versions of what the truck was meant to be.

For a judged 1974 Jeep Truck, the biggest mistakes are usually choosing the wrong wheel diameter family or using a tire appearance that does not match the truck’s restoration goal. Even if the tire physically mounts, a visually incorrect sidewall or an obviously mismatched size can stand out immediately. Event-specific standards can differ, so it is wise to check the rulebook or consult Jeep restorers familiar with the class where the truck will be shown.

For the 1974 Jeep Truck, Firestone Classic Bias Ply and BFGoodrich Silvertown Classic Bias Ply overlap in sizes such as 700-15 and 750-16. Both stay within the traditional bias-ply construction expected for the era, and both are available in wide whitewall form. In 700-15, each carries a 1700-pound load rating at 32 psi where that figure is stated, while in 750-16 the BFGoodrich version reaches 1850 pounds at 48 psi compared with 1660 pounds at 40 psi for the Firestone example shown in that size.

That makes the choice on a 1974 Jeep Truck partly visual and partly specification-driven within the same vintage category. If the truck’s look is your first priority, compare the sidewall branding and whitewall presentation that best match your restoration taste. If you are narrowing between products in one shared size, pay attention to the exact load-and-pressure markings on the sidewall rather than assuming every classic bias-ply tire in that size behaves the same way.

1974 Jeep Truck tires can be suitable for highway driving when they are in good condition, properly inflated, and used within their intended service limits. Every size in this application is bias-ply, so the driving feel will be more period-correct than modern, with the kind of tracking and response vintage truck owners generally expect. No speed ratings appear on these size offerings, which means the tire should be treated as part of a broader vintage-truck system rather than as a modern high-speed package.

On a 1974 Jeep Truck, the truck’s brakes, steering, suspension, alignment, and age-related mechanical condition are often just as important as the tires during highway use. A well-sorted full-size Jeep can cruise comfortably, but it should still be driven with the manners of a 1970s pickup in mind. Before regular highway travel, make sure the tires are age-sound and matched correctly to the wheels instead of relying on tread depth alone.

Inflation pressure for a 1974 Jeep Truck depends on the exact tire size and the specific product chosen. Some examples include 700-15 at 1700 pounds and 32 psi, G78-15 at 1620 pounds and 32 psi, H78-15 from 1770 pounds at 32 psi up to 1830 pounds at 45 psi depending on product, 750-16 from 1660 pounds at 40 psi up to 1850 pounds at 48 psi, 800-16.5 at 2045 pounds and 60 psi, and 950-16.5 at 2780 pounds and 60 psi. Those figures are tire ratings, not one universal factory setting for every 1974 Jeep Truck.

The best practice is to use your 1974 Jeep Truck owner’s literature as the baseline for vehicle recommendation, then compare that with the exact tire manufacturer’s sidewall markings and intended load use. Do not transfer a pressure figure from one size to another just because both fit the same year and make. A 15-inch whitewall bias-ply and a 16.5-inch heavy-duty truck tire can require very different pressures to work as intended.

Before a longer drive in a 1974 Jeep Truck, inspect each tire for cracking, cuts, bulges, punctures, irregular wear, and proper inflation. Check the spare as carefully as the road tires, since many collector trucks carry an old spare that has gone untouched for years. If the truck uses a heavier-duty 16.5-inch setup, also pay close attention to load range suitability for what you plan to carry. Tire readiness is only one part of the trip equation, but it is an essential one.

A sensible pre-trip routine for a 1974 Jeep Truck also includes checking brakes, steering play, wheel bearings, lights, fluids, belts, and cooling system condition. Vintage pickups can tolerate local use while hiding problems that become obvious only after sustained speeds or heat buildup. Taking ten extra minutes to inspect the truck before departure usually does more for confidence and safety than any change in brand or sidewall style.