1981 Jeep Trucks J20 Tires

The 1981 Jeep Trucks J20 uses two primary tire sizes: 875-16.5 and 950-16.5. Both are bias-ply truck tires designed for 16.5-inch rims, and both appear across the covered J20 weight classifications rather than being limited to only one of them.

That makes the real fitment question less about sub-model name and more about the truck’s actual wheel and tire setup. A J20 that has been kept original-looking, repaired over time, or modified with different wheels may not be using the same size it left service with, so checking the existing wheel diameter and the current tire size is the smart first step.

The primary tire sizes for the 1981 Jeep Trucks J20 both use a 16.5-inch rim diameter. That applies to 875-16.5 and 950-16.5, so the wheel diameter stays the same even though the tire width designation changes between the two sizes.

Rim diameter is only part of the fitment picture on a vintage truck. Width also matters, especially if the truck is using 950-16.5, since available products in that size call for a 6.50 to 6.75-inch rim width. A quick wheel check helps avoid choosing a tire that matches the diameter but not the wheel’s usable width.

Yes. Both covered 1981 Jeep Trucks J20 sub-models, over 8400 GVWR and under 8400 GVWR, use the same two tire sizes: 875-16.5 and 950-16.5. Both are bias-ply fitments for 16.5-inch rims, so the available size range is shared across the sub-models.

Even with shared fitment, a truck should still be matched to the size that suits its actual wheels and present-day configuration. Many older pickups have seen wheel replacements, suspension work, or mixed-service use over the years, so it is better to confirm what is on the truck now than to assume either size automatically belongs on every J20.

Start with the correct size and wheel diameter, since the 1981 Jeep Trucks J20 uses 875-16.5 or 950-16.5 bias-ply tires on 16.5-inch rims. After that, the main differences are the tire series, the wheel-width suitability where stated, and whether the truck is being set up for general road use, work-truck character, or a traditional vintage appearance.

The 950-16.5 options add another layer because the available products include a 6.50 to 6.75-inch rim width specification and a 2780 at 60 psi load figure. Matching those details to the truck’s wheels and intended use is more helpful than choosing by appearance alone, especially on a heavy-duty pickup like the J20.

The available tires for the 1981 Jeep Trucks J20 come from STA. That includes 875-16.5 and 950-16.5 bias-ply truck tires across series such as Traxion, Transport Highway, and Super Transport, all in blackwall form.

Since the brand choice is concentrated, comparison becomes more about the series and the truck’s intended use than about switching among several manufacturers. Looking at the tread family, weight, stated rim-width fitment where available, and the overall look you want on the truck will usually be more productive than focusing on brand alone.

The 1981 Jeep Trucks J20 is supported by STA tire series that include Traxion, Transport Highway, and Super Transport. Traxion appears in both 875-16.5 and 950-16.5, while Transport Highway is offered in 875-16.5 and Super Transport appears in 950-16.5.

Those series differences matter because they help shape the kind of truck presentation you want, even when the construction and sidewall style stay consistent. Once the correct size is confirmed, comparing series is a practical way to narrow the choice without drifting away from the J20’s traditional bias-ply, blackwall truck tire character.

A period-style 1981 Jeep Trucks J20 starts with one of its proper primary bias-ply sizes, either 875-16.5 or 950-16.5, depending on the truck’s actual wheel setup. Keeping the original-style construction and 16.5-inch rim relationship preserves the heavy-duty look that suits a full-size Jeep pickup from this era.

From there, the choice usually comes down to how the truck is being presented and used. A restoration-oriented truck may call for the size and tread style that best matches its established appearance, while a road-driven truck still needs the wheel, clearance, and load side of the decision checked carefully before settling on one size or series.

On a restored 1981 Jeep Trucks J20, bias-ply construction contributes strongly to the truck’s traditional stance and overall visual character. Since the primary fitments here are both bias-ply truck sizes, staying within that construction keeps the look aligned with the J20’s working-era design rather than giving it a more modern tire presentation.

Appearance is not only about size stamping on the sidewall. The blackwall treatment and the selected STA series also influence whether the truck reads more like a roadgoing vintage pickup or a more utility-focused heavy-duty truck. Buyers aiming for exact historical authenticity should also compare their choice with marque-specific restoration references for the individual truck.

Yes. Modifications can change tire fitment on a 1981 Jeep Trucks J20 even when the tire size looks correct on paper. Aftermarket wheels, altered wheel width, suspension changes, ride-height changes, or body work can all affect how an 875-16.5 or 950-16.5 tire sits on the truck.

That is especially important with an older heavy-duty pickup, because many have been repaired or updated over time. A modified J20 should be checked for wheel diameter, wheel width, steering clearance, and fender clearance before new tires are chosen. Verifying those basics first helps keep the tire decision tied to the truck’s actual present-day configuration.

Before driving a 1981 Jeep Trucks J20 on new tires, inspect the wheels for correct diameter and condition, confirm the lug hardware is right for the wheels, and look over suspension and steering components for obvious wear. Tire pressure should also be set correctly for the chosen tire and the truck’s intended use.

A short clearance check is worthwhile before regular road use. Turn the steering through its range, look for interference around fenders and suspension parts, and watch for any uneven stance that might point to wheel or spring issues. On a vintage truck, a new tire cannot make up for worn mechanical parts or a mismatched wheel setup.

Collector-use 875-16.5 and 950-16.5 tires should be kept properly inflated, inspected regularly for cuts, bulges, cracking, and uneven wear, and checked for air loss before the truck is driven. Bias-ply truck tires on a low-use vehicle still age even when tread wear is minimal, so condition matters as much as mileage.

Storage habits also make a difference on a vintage J20. Keeping the truck away from prolonged sun, moisture, and ozone sources helps preserve the tires, and periodic inspection remains important even when the truck is not driven often. Any sign of age-related deterioration or persistent pressure loss deserves attention before returning the truck to road use.