1981 Subaru Trucks Tire Fitment Guide

1981 Subaru Trucks Brat models use two tire sizes: 165R13 and 185/70R13. Both are radial 13-inch sizes, and both apply to the Brat rather than being split among different Subaru truck models for that year. The 165R13 fits 13-inch wheels with approved rim widths of 4.50 to 6.00 inches where that range is specified, while 185/70R13 fits 13-inch wheels with approved rim widths ranging from 4.5 to 6.5 inches depending on the product.

That means the first step is confirming which 13-inch wheel width is actually on your Brat, not just confirming year and make. If your truck already wears one of these sizes, use that as a starting point and verify the wheel before changing to the other size, since both will mount on the same diameter wheel but do not share exactly the same approved width range.

On a 1981 Subaru Trucks Brat, 165R13 is a euro-metric radial size. The 165 refers to nominal section width in millimeters, the R indicates radial construction, and the 13 is the wheel diameter in inches. When no aspect ratio is printed in this style of metric size, it is conventionally treated as an 80-series radial.

That makes 165R13 the more traditional-looking of the two Brat sizes here, especially if you want a narrower metric tire with a taller sidewall appearance. It is a useful format to understand because it looks simpler than a modern metric code, but it still carries the same basic information you need for fitment: width, radial construction, and wheel diameter.

On a 1981 Subaru Trucks Brat, 185/70R13 is a metric radial size that gives more detail than 165R13. The 185 is the nominal section width in millimeters, 70 is the aspect ratio, R means radial construction, and 13 is the wheel diameter in inches. Compared with 165R13, it is wider and lower in profile.

That difference matters most in appearance and stance on a Brat. A 185/70R13 generally gives a broader footprint and a shorter sidewall look than a 165R13, so owners often weigh visual style and wheel-width compatibility before choosing between them. It is still essential to confirm the actual wheel width, since a wider tire can demand a different approved rim-width range.

For a 1981 Subaru Trucks Brat, both sizes are radial and both use a 13-inch wheel, so this choice is mainly about size, profile, and presentation rather than bias-ply versus radial construction. The 165R13 keeps a narrower, more traditional small-car metric appearance, while the 185/70R13 is wider and lower in profile. Each can be correct for a Brat depending on how the truck is equipped and the look you want.

Owners who want a more restrained original-style metric fit often lean toward 165R13, while those aiming for a broader stance or period-custom appearance often prefer 185/70R13. Before deciding, verify the wheel width, compare the truck's current tire size, and think about whether sidewall appearance matters, since 185/70R13 opens the door to blackwall, redline, and wide whitewall treatments.

1981 Subaru Trucks tire options span several sidewall styles depending on size. The 165R13 is available as a blackwall only, which suits the tidy, understated look many compact imports of the period carried. The 185/70R13 broadens the styling choices with blackwall, redline, and wide whitewall versions.

For a stock-looking Brat, blackwall is usually the easiest choice to keep the tire visually in step with the truck's original character. Redline and wide whitewall treatments shift the look in a more customized direction and can make sense if the truck is being built around a period style rather than strict factory-type presentation. Sidewall style does not override basic fitment, so choose size first and appearance second.

1981 Subaru Trucks fitments are available from Michelin, Dunlop, BFGoodrich, and Avon. In 165R13, the available brands are Michelin and Dunlop. In 185/70R13, the available brands are BFGoodrich, Avon, and Dunlop.

That mix gives Brat owners a useful spread of choices depending on whether they want a straightforward blackwall metric radial or a more stylized sidewall treatment. Brand selection also varies by size, so it helps to settle the tire size first before narrowing the field by appearance or speed rating. If you are matching an existing set, check the exact size and sidewall before replacing only one or two tires.

Rim-width guidance for 1981 Subaru Trucks tires depends on the size you choose. The 165R13 is paired with approved rim widths of 4.50 to 6.00 inches on Michelin examples. The 185/70R13 is paired with approved rim widths of 4.5 to 6.0 inches on Avon and 5.00 to 6.50 inches on BFGoodrich versions, so the full range across that size runs from 4.5 to 6.5 inches.

That range is wide enough to make wheel verification important before you change sizes or switch brands. A Brat with a narrow stock wheel may suit one 185/70R13 product differently than another, even though the nominal size is the same. Measure the wheel or confirm its stamped width before mounting a different tire style to avoid an unnecessary mismatch.

1981 Subaru Trucks tire requirements for tubes depend on the exact product. The Michelin 165R13 options carry tubeless markings, while other presentations within the 165R13 group do not state tube status the same way. The 185/70R13 products here do not all use tube markings consistently, so tube status can vary by product presentation and should be confirmed on the tire itself and against the wheel design.

The wheel matters as much as the tire because an older wheel may have different sealing characteristics than a newer one. If your Brat still uses original wheels, verify whether they are intended for tubeless radial service before assuming any modern reproduction radial should be run the same way. That quick check helps prevent slow leaks, valve-stem issues, and avoidable mounting complications.

Both 165R13 and 185/70R13 for 1981 Subaru Trucks use a 13-inch rim diameter, so the original wheel diameter is compatible with either size in principle. The real variable is wheel width, because approved rim-width ranges are not identical across the two sizes or across every brand within 185/70R13.

That means many original Brat wheels can work with either size, but only after the wheel width is checked against the tire you intend to use. Staying with the same tire size already on the truck usually simplifies the decision. Moving to the wider 185/70R13 deserves a little more attention, especially if the truck still has narrow factory wheels or if you are matching a specific sidewall style.

A 1981 Subaru Trucks Brat should be stored in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, welders, and other ozone-producing equipment that can age sidewalls prematurely. Keep the tires clean, maintain normal storage pressure, and move the truck periodically if it will sit for long stretches so the same part of each tire is not carrying the load continuously.

Radials generally tolerate storage better than old-style bias-ply tires, but they still age from time, heat, and environmental exposure. If the Brat will be parked for a season or longer, rolling it occasionally or using stands appropriately can reduce flat spotting and stress on the carcass. A simple storage routine does more for tire longevity than many owners realize.

Tires on a 1981 Subaru Trucks Brat should be judged more by age and condition than by miles alone, because many collector vehicles see limited annual use. A sensible rule is to begin evaluating tires closely once they reach about five to seven years of age and to treat ten years as a point where replacement deserves serious consideration regardless of remaining tread. The DOT date code on the tire helps establish its age.

A Brat that spends most of its time parked can still wear out its tires chemically even if the tread looks fresh. Sidewall cracking, hardening, vibration, or repeated air loss can matter more than tread depth on a lightly used vintage truck. Replacing old tires before they visibly fail is often the right move for a vehicle that sees weekend use or longer pleasure drives.

Tires on a 1981 Subaru Trucks Brat deserve a quick inspection before every drive and a more thorough check before any longer outing. Look for sidewall cracking, cuts, punctures, bulges, irregular tread wear, and changes in air pressure retention. If your wheel-and-tire setup uses tubes, include the valve stems and any signs of slow leakage in the routine.

Frequent inspection matters because collector vehicles often sit longer between drives, and problems can develop quietly during storage. A Brat that feels fine on a short local trip may still reveal age-related issues once speed and temperature build on a longer run. Catching a cracked sidewall, low tire, or damaged stem in the garage is far better than finding it on the shoulder.

A 1981 Subaru Trucks Brat would have been fitted from new with radial tires, not bias-ply tires, which fits the broader industry shift by the early 1980s toward radial construction on compact imported vehicles. Within this year and make, the Brat is associated with 165R13 and 185/70R13 fitments, both on 13-inch wheels. Original-equipment brand could vary by market and production details, so size and construction usually matter more than assuming one universal factory brand.

For a restoration aimed at factory-type presentation, start by confirming the size shown on surviving labels, manuals, or original wheels on your particular truck. If the Brat is being judged, a Subaru club, marque specialist, or period brochure can help sort out market-specific nuances. Getting the radial size and sidewall character right is usually the first authenticity step before worrying about finer details.

Correct tire fitment absolutely matters when showing a 1981 Subaru Trucks Brat, especially if the event values factory-type appearance. Judges and knowledgeable enthusiasts often notice whether the tire size, radial construction, overall profile, and sidewall treatment suit the era and the vehicle's intended presentation. A dramatically different profile or a decorative sidewall treatment that does not match the truck's restoration theme can stand out quickly.

That does not mean every show truck must wear the same style, because some events welcome period-custom expression as much as strict originality. The key is consistency: a stock-restored Brat generally benefits from a restrained radial look, while a custom build can justify redlines or other visual departures if the rest of the truck supports it. Event-specific standards are best confirmed with the organizing club before judging day.

For a 1981 Subaru Trucks Brat in 165R13, Michelin XAS and Michelin XAS-FF share the same basic size marking, H speed rating, blackwall appearance, radial construction, 13-inch rim diameter, and approved rim-width range of 4.50 to 6.00 inches. The practical difference comes down to the tire series itself rather than a change in nominal fitment. Both present as classic-style metric radials suited to the same wheel diameter and general application.

Because the basic fitment dimensions overlap so closely, most owners choosing between them should focus on the exact series they want for appearance, brand preference, and how they are matching the rest of the vehicle. If you are replacing a partial set, keep the same series across an axle whenever possible. Matching tire family and visual character matters on a collector Brat just as much as matching the printed size.

1981 Subaru Trucks tires can be suitable for highway driving when they are in good condition, properly inflated, and matched to the vehicle's wheels. The radial options here include H-rated products with a 130 mph ceiling and a V-rated product with a 149 mph ceiling, which is well beyond the real-world cruising demands of a 1981 Brat. On an older compact truck like this, overall mechanical condition often matters more than the raw speed ceiling printed on the tire.

Brakes, steering play, alignment, wheel bearings, and suspension condition all influence highway confidence just as much as the tire itself. A fresh set of correctly fitted radials cannot make up for neglected chassis components, but they can provide the right foundation when the truck is sorted properly. If the Brat is newly acquired or has sat for years, inspect the whole running gear before planning sustained highway use.

Inflation pressure on a 1981 Subaru Trucks Brat should start with the vehicle manufacturer's recommendation for the original application, then be checked against the tire maker's information for the exact reproduction or replacement tire you are using. Within these sizes, some products also show load-and-pressure figures such as 1135 pounds at 35 psi for certain 185/70R13 options. That figure belongs to that specific tire and should not be transferred automatically to every 13-inch size.

Using the right pressure is important because a lightweight Brat can feel noticeably different with only a small pressure change. Too much air can make the truck ride harshly and wear the center of the tread, while too little can dull steering and increase heat. Treat the sidewall's maximum-rated figure as a product limit, not a blanket recommendation for every driving situation.

Before a longer drive in a 1981 Subaru Trucks Brat, inspect all four tires and the spare for cracking, cuts, bulges, punctures, uneven wear, and stable inflation pressure. Confirm that the valve stems are in good condition and pay extra attention if your wheel-and-tire combination uses tubes. Tire age matters too, so an older-looking tire with deep tread still deserves scrutiny.

A longer outing is also the time to check the rest of the truck with the same seriousness. Lug-nut torque, wheel-bearing play, brakes, fluids, belts, hoses, and lights all deserve attention on a vehicle of this age. Tires are only one part of the equation, but they are the part that keeps every other system connected to the road.