1976 Mazda Tire Fitment Guide

1976 Mazda vehicles use seven sizes across five model lines. The 808 uses 155R13 or 6.15-13, the B1600 and B1800 use 6.00-14, the Cosmo uses 185/70R14, the RX-3 uses 155R13 or 560-13, and the RX-4 uses 195/70R13 or BR70-13. Rim diameters span 13 and 14 inches, so there is no one-size-fits-all answer for the full 1976 Mazda range.

That means the first fitment question is not brand or sidewall style, but model identification. Once you know the exact Mazda model, you can narrow the tire search to the correct diameter and then decide whether you want a radial for road use or a bias-ply tire for a more period-authentic presentation where that choice exists.

On a 1976 Mazda, 155R13 is a Euro-metric radial size. The 155 refers to a 155-millimeter section width, the R identifies radial construction, and the 13 is the wheel diameter in inches. This size appears on the 1976 Mazda 808 and 1976 Mazda RX-3, and available versions include H-rated products with a 130 mph speed ceiling.

The important practical point is that 155R13 is not a bias-ply code, even though it still looks compact by modern standards. If your 808 or RX-3 can use both a radial and a bias-ply option, this size keeps you in a small 13-inch fitment while moving you toward a radial driving experience instead of a purely restoration-oriented bias-ply setup.

No, 1976 Mazda models do not use the same tire size. The 808 and RX-3 share 155R13 as a radial option, but each also has its own bias-ply counterpart, while the B1600 and B1800 pickup use 6.00-14, the Cosmo uses 185/70R14, and the RX-4 uses 195/70R13 or BR70-13. The lineup splits between both 13-inch and 14-inch wheel diameters.

That model-by-model variation is typical of a make with compact cars, rotary performance models, a personal luxury coupe, and a pickup all in one year. If you are unsure whether your car has been changed over the years, compare the sidewall size on the current tire to the actual wheel diameter before settling on a replacement path.

For a 1976 Mazda 808, the decision between 155R13 and 6.15-13 comes down mainly to radial versus bias-ply construction. The 155R13 is a radial used on the 808 and RX-3, while 6.15-13 is a bias-ply fitment specific to the 808. The radial route is usually favored by owners who plan to drive regularly, while the bias-ply route is often chosen to preserve a more era-correct look and feel.

That does not make one automatically right for every 808. A restoration focused on originality often leans toward the bias-ply size, while a car meant for casual touring may benefit from staying within the radial fitment. The key is to confirm which 13-inch wheel is on the car now and choose the construction that matches your restoration goals and driving expectations.

Sidewall style varies notably across the 1976 Mazda range. The 155R13 choices are Blackwall radials, the 185/70R14 Cosmo fitment is available in both Blackwall and Wide Whitewall form, the 560-13 RX-3 bias-ply fitment comes in Narrow Whitewall and Wide Whitewall versions, and the 195/70R13 RX-4 radial appears in Narrow Whitewall form. Sidewall presentation is part of the visual character, not just a cosmetic afterthought.

For a mid-1970s Japanese car, Blackwall is often the most neutral and broadly era-appropriate appearance, especially on sporting or economy-oriented models. Whitewall choices can make more sense when the goal is a distinctly period showroom flavor or a more upscale presentation, particularly on a Cosmo. If authenticity matters for judging, check the standards used by your specific club or event.

Several brands cover the 1976 Mazda range, depending on size. Michelin and Dunlop make 155R13, BFGoodrich, Avon, Dunlop, and Michelin cover 185/70R14, BFGoodrich and Firestone cover 560-13, and BFGoodrich covers 195/70R13. Brand choice is tied closely to the exact size and sidewall style rather than to Mazda as a make by itself.

That means it helps to settle the fitment path first and brand second. Once you know whether you need a compact Blackwall radial, a whitewall bias-ply, or a larger vintage radial, the field narrows quickly. Comparing brands then becomes more meaningful because you are looking at tires in the same size family and with the same basic visual intent.

Rim width guidance is available for several 1976 Mazda sizes. 155R13 fits 4.00 to 5.50-inch rims, 185/70R14 fits ranges of 4.5 to 6.5 inches depending on the tire, 560-13 fits 3.50 to 4.50-inch rims depending on brand, and 195/70R13 fits 5.00 to 6.50-inch rims. Those ranges are size-specific, so they should not be transferred from one Mazda model to another.

A wheel that accepts one 13-inch tire does not automatically suit every other 13-inch tire. The safest approach is to confirm both the rim diameter and the actual wheel width before final selection, especially on cars that may have seen wheel changes over the years. That check becomes even more important when moving between bias-ply and radial fitments.

Inner-tube requirements vary within the 1976 Mazda range and, in some cases, within the same size family. Some radial products for 155R13 and 185/70R14 carry tubeless marking, while others in those sizes do not state TL on the sidewall description, so tube status varies by product. For the other 1976 Mazda sizes here, the tire itself should be matched to the wheel type rather than assumed one way or the other.

The wheel matters as much as the tire. An original wheel designed around tube-type service may still call for a tube even when the replacement tire itself is tubeless-capable, while a sound tubeless wheel may not. Confirm the actual wheel construction and the sidewall marking on the exact tire before assembly so the tire, tube decision, and wheel all agree.

Original 1976 Mazda wheels can only be used with tire sizes that match their rim diameter, and the 1976 Mazda range spans both 13-inch and 14-inch wheels. A 13-inch 808, RX-3, or RX-4 wheel cannot accept a 14-inch Cosmo or B-series truck tire, and a 14-inch wheel cannot take a 13-inch tire. Diameter compatibility is absolute before any other fitment question is considered.

Within the same diameter, wheel width still has to be checked before mixing sizes. Some 13-inch fitments are intended for relatively narrow wheels, while others require a wider radial-friendly range. If your Mazda has replacement wheels or a long ownership history, measure the wheel and verify the stamped size instead of assuming the current setup is original.

A stored 1976 Mazda should be kept out of direct sunlight, away from ozone-producing equipment such as electric motors and welders, and off damp surfaces if possible. Keep the tires properly inflated, move the car periodically, and consider stands or tire cradles for long static storage. Bias-ply tires used on some 1976 Mazda models are generally more prone to temporary flat-spotting during long rests than radials.

Good storage habits protect both appearance and drivability. A clean, cool garage and occasional rolling of the car reduce stress on the casing and sidewalls, while avoiding long exposure to sunlight helps slow cracking. If the car sits through an entire season, inspect sidewalls and valve areas before the first drive rather than assuming the tires are ready because tread still looks fresh.

Tires on a 1976 Mazda should be judged more by age and condition than by mileage, because many collector cars and vintage trucks cover limited annual miles. A good rule is to begin careful evaluation around five to seven years of age and to treat around ten years as a serious replacement point regardless of tread depth. The DOT date code on the tire sidewall is the best starting place for that timeline.

Low mileage can create a false sense of security on an older Mazda. Sidewall cracking, internal aging, and long periods of inactivity can matter more than visible tread wear. If the car's history is unclear, start with the date code, inspect for hardening or cracks, and replace on age and condition before trusting the tires for regular driving or longer trips.

Tires on a 1976 Mazda deserve a quick inspection before every drive and a more thorough look before any extended outing. Check air pressure, visible sidewall cracking, cuts, bulges, irregular tread wear, and whether the tire is holding pressure consistently between uses. Any 1976 Mazda setup that uses tube-type service also deserves close attention at the valve stem and around the wheel interface.

Frequent inspection is especially important because these cars and trucks are often driven infrequently, which means problems can develop while parked rather than on the road. A two-minute walkaround catches issues early and helps you avoid putting stress on suspension, steering, and braking systems that were never designed to compensate for a deteriorating or underinflated tire.

A 1976 Mazda 808 could be associated with both a radial and a bias-ply size, specifically 155R13 and 6.15-13. That reflects the mid-1970s transition period when radial tires were becoming common while bias-ply fitments still remained part of the market. For originality research, the important point is that both construction types belong to the era, but the exact factory fit can vary by market, equipment package, and how the car was originally delivered.

If you are restoring a 1976 Mazda 808 for a high-authenticity result, start by verifying what your individual car carried when new through period literature, surviving examples, or a marque club. Then choose the tire size and sidewall style that matches that evidence. That approach is stronger than relying on broad year-and-make assumptions alone.

Correct tire fitment can matter a great deal when showing a 1976 Mazda, especially in judged classes that emphasize factory appearance or period correctness. Size, construction type, and sidewall style all contribute to whether the car looks right for its era and model. A modern-looking radial on a car restored to strict original specification, or a sidewall treatment that clashes with the vehicle's market character, can stand out immediately.

The right answer depends on the level of judging. A local casual show may be far more forgiving than a marque-specific concours, where judges often know the expected visual language of a 1970s Mazda. Before finalizing your tire choice, compare your car's intended class with club guidance so the tire supports the restoration instead of undermining it.

For the 1976 Mazda RX-3 in 560-13, BFGoodrich and Firestone both offer bias-ply tires, but they differ in sidewall treatments and approved rim-width range. BFGoodrich offers both Narrow Whitewall and Wide Whitewall versions on 3.50 to 4.00-inch rims, while Firestone offers a Wide Whitewall version on 4.00 to 4.50-inch rims. Load marking reaches 850 pounds at 30 psi in both cases.

That makes the choice partly visual and partly wheel-related. If your RX-3 has a narrower wheel, the BFGoodrich range may align more closely, while a slightly wider wheel can open the Firestone option as well. For a show-focused build, the whitewall width and brand character may influence the decision just as much as the dimensional fit.

1976 Mazda tires can be safe for highway driving when the tire is in sound condition, correctly matched to the wheel, and used within its construction and speed rating. The radial options here include H-rated tires with a 130 mph ceiling and a V-rated 185/70R14 with a 149 mph ceiling, while other sizes rely more on vintage-style construction and intended use. In normal use, the car's age, braking system, suspension condition, and alignment often matter as much as the tire's top-speed marking.

Safety on the road is less about chasing the highest rating and more about running the correct size in healthy condition on a mechanically sorted car. A well-maintained 1976 Mazda on proper tires is a very different proposition from one with old rubber, weak shocks, or neglected steering parts. Treat the tires as one part of the whole system before any sustained highway trip.

Inflation pressure on a 1976 Mazda should be set with the vehicle's factory recommendation and the exact tire's rating in mind, not by copying numbers across the whole lineup. Some available tires include load-and-pressure figures such as 850 pounds at 30 psi for 560-13, 1,201 pounds at 35 psi for one 185/70R14, 1,235 pounds at 35 psi for another 185/70R14, and 1,246 pounds at 35 psi for 195/70R13. Those are tire capability figures, not a universal inflation prescription for every 1976 Mazda.

Start with the factory vehicle recommendation if you have it, then confirm that the tire's own sidewall and manufacturer guidance support that use. Pressure can change with size, construction, and vehicle application, so a compact pickup and a rotary coupe should not be treated the same by default. Keeping a written record of cold pressures also helps spot slow leaks early.

Before a longer drive in a 1976 Mazda, inspect each tire for sidewall cracks, weather-checking, cuts, bulges, embedded objects, uneven wear, and correct cold pressure. Check the spare as well, since many vintage cars still carry an old but unused tire that may be far past its safe age. If your setup uses tube-type service, pay close attention to valve-stem condition and any signs of leakage around the wheel.

That tire inspection should be part of a broader pre-trip check that includes brakes, steering, fluids, belts, and cooling-system health. Vintage Mazdas are light and engaging cars, but long drives expose any weak point quickly. Spending a few minutes on the tires first helps you catch the most common age-related problem before it becomes a roadside failure.