1981 Mazda Tire Fitment Guide

1981 Mazda vehicles use five tire sizes across three model lines: 165R13 and 185/70R13 for the Mazda 626 and Mazda RX-7, plus 155R13, 6.15R13, and 175/70R13 for the Mazda GLC. Every one of those sizes fits a 13-inch rim. Rim-width guidance is available for several sizes, including 4.50 to 6.00 inches for 165R13, 5.00 to 6.50 inches or 4.5 to 6.0 inches depending on the 185/70R13 product, 4.00 to 5.50 inches for 155R13, and 4.5 to 6.0 inches for 175/70R13.

The practical takeaway is that wheel diameter alone does not identify the right tire for a 1981 Mazda. A 13-inch rim is common across the range, but the GLC, 626, and RX-7 do not all use the same section width or profile. Start by identifying the model, then verify the size already on the car or check the vehicle's original tire placard or manual before choosing among the available products.

On a 1981 Mazda, 165R13 is a radial metric size. The 165 refers to a nominal section width of 165 millimeters, the R indicates radial construction, and the 13 is the wheel diameter in inches. When a metric radial size is written without an aspect ratio, it is conventionally treated as an 80-series profile. On 1981 Mazda applications, 165R13 is used on the 626 and RX-7 rather than the GLC.

That makes 165R13 a useful size for owners who want a taller-profile 13-inch radial in a very period-consistent format. It is available in blackwall form from Michelin and Dunlop, and H-speed-rated examples appear in this size. If your 1981 Mazda currently wears 165R13, that sidewall marking is a much better guide than choosing by appearance alone, especially when the same wheel diameter was used with other widths and profiles.

No. The 1981 Mazda lineup shares a common 13-inch rim diameter, but the tire sizes differ by model. The 626 and RX-7 use 165R13 and 185/70R13, while the GLC uses 155R13, 6.15R13, and 175/70R13. That split reflects the different roles of the cars: family car, economy subcompact, and sports coupe, each with its own stance and tire proportion.

For a buyer, that means year and make are only the starting point. If you own a 1981 Mazda GLC, the correct choice comes from the GLC-only sizes, even though a 626 or RX-7 tire may share the same rim diameter. If you own a 626 or RX-7, the next step is narrowing between the two shared sizes by checking the car's current sidewall marking and the wheel's width range.

1981 Mazda tire choices include more than one sidewall style, but the variety is concentrated in 185/70R13. That size is available in blackwall, redline, and wide whitewall form, while 165R13, 155R13, and 175/70R13 are blackwall choices. For a Japanese car from 1981, blackwall is generally the most era-consistent look, especially for cars restored to an original-market appearance.

Sidewall style mainly affects the visual character of the car rather than the basic fitment. A blackwall tends to suit stock-looking 626, GLC, and RX-7 restorations, while a redline or wide whitewall on 185/70R13 moves the look in a more personalized direction. If appearance matters as much as dimensions, decide on sidewall style early so you do not narrow to the right size and then realize the visual treatment is wrong for your project.

Four brands cover 1981 Mazda applications here: Michelin, Dunlop, BFGoodrich, and Avon. The 165R13 is available from Michelin and Dunlop, the 185/70R13 from BFGoodrich, Avon, and Dunlop, the 155R13 from Michelin and Dunlop, and the 175/70R13 from Avon. All of these are radial offerings, but the brand mix changes with the size rather than staying uniform across the whole Mazda range.

That brand spread gives owners room to prioritize different goals such as a more European-style touring character, a sportier visual presentation, or a traditional blackwall look. The key is not to choose brand first and fitment second. Start with the correct size for your 1981 Mazda model, then compare the available brands within that size for sidewall treatment, speed rating, and wheel-width compatibility.

In the 165R13 and 155R13 sizes used on 1981 Mazda vehicles, Michelin XAS and Dunlop SP Sport Aquajet share radial construction and blackwall styling, but they differ in details. Michelin examples in 165R13 and 155R13 carry H speed ratings and show tubeless sidewall markings, with rim-width guidance of 4.50 to 6.00 inches for 165R13 and 4.00 to 5.50 inches for 155R13. Dunlop also appears with H speed ratings in both sizes, and its 165R13 and 155R13 versions carry stated load capacities of 1,047 pounds and 937 pounds respectively.

That means the choice comes down less to basic construction and more to the exact size, wheel compatibility, and the way you want to balance originality, brand preference, and sidewall detail. A 1981 Mazda owner comparing these two lines should check the wheel width first, then compare the sidewall markings and load or speed information on the specific tire being considered. Staying within the correct size matters more than jumping between brands.

Several 1981 Mazda sizes have clear wheel-width guidance. The 165R13 fits rims from 4.50 to 6.00 inches wide, 155R13 fits 4.00 to 5.50 inches, and 175/70R13 fits 4.5 to 6.0 inches. The 185/70R13 range depends on the product, with some versions fitting 4.5 to 6.0-inch rims and others fitting 5.00 to 6.50-inch rims. All of these sizes use a 13-inch rim diameter.

That variation matters because two tires with the same nominal size may not share the exact same wheel-width recommendation. If your 1981 Mazda already has aftermarket wheels, measuring the actual rim width before choosing a tire is worth the extra effort. A tire can share the correct 13-inch diameter and still be a poor match for the wheel if the width falls outside the manufacturer's approved range.

Inner-tube requirements on 1981 Mazda tires depend on the exact product. Michelin examples in 165R13 and 155R13 carry TL markings, which indicate tubeless construction. Other products in the same year and make do not all show the same sidewall notation, so tube status can vary by product rather than being identical across every 13-inch Mazda tire.

The wheel itself matters as much as the tire marking. If your 1981 Mazda still uses original steel wheels, inspect wheel condition, valve-stem setup, and bead-seat condition before assuming a tubeless tire should simply be mounted and driven. Matching the wheel to the tire's sidewall designation is the safest route, especially on a collector car that may have sat unused for long periods.

All 1981 Mazda tire sizes here share a 13-inch rim diameter, so the wheel diameter itself is common across the 626, GLC, and RX-7. That does not automatically mean every original wheel is suitable for every tire size, because wheel-width recommendations vary from one size and product to another. A 155R13, 165R13, 175/70R13, and 185/70R13 may all fit 13-inch rims, but they do not all call for the same wheel width.

The safest approach is to treat wheel diameter and wheel width as separate checkpoints. If your original 1981 Mazda wheels are still on the car, verify their width before moving between sizes, especially when stepping from a narrow economy-car fitment to a wider 185/70R13. That extra check helps avoid sidewall distortion, poor bead seating, or a tire that technically mounts but is not being used within its intended wheel range.

A stored 1981 Mazda should be kept out of direct sunlight and away from electric motors, welders, furnaces, and other ozone-producing equipment that can age rubber prematurely. Clean, dry floors are better than damp concrete, and the car should be moved slightly from time to time or supported in a way that reduces long-term weight concentration on one spot of the tread. Radials generally tolerate storage better than old bias-ply tires, but they still age from time, heat, and ozone exposure.

That matters especially for low-use 626s, GLCs, and RX-7s that may spend months parked between drives. Even a tire that looks nearly new can develop flat-spotting, sidewall weathering, or internal age-related decline if it sits in poor conditions. If the car is part of a longer restoration cycle, checking pressures regularly and shielding the tires from sunlight will do more for longevity than simply leaving the car untouched.

On a collector-driven 1981 Mazda, tire age usually matters more than tread wear. A sound rule is to evaluate tires closely once they reach about five to seven years of age and to treat the ten-year mark as a strong point for replacement consideration, even if the tread still appears deep. The DOT date code on the tire sidewall is the best way to determine age, since many vintage and collector cars accumulate very few miles.

That age-based approach is especially important on cars like the RX-7 or GLC that may be driven infrequently and then expected to perform normally on a weekend outing. Rubber hardens over time, and older tires can lose wet-weather confidence and ride quality before they look obviously worn out. If your 1981 Mazda still wears an older set, age should weigh more heavily in the decision than appearance alone.

Tires on a 1981 Mazda should be inspected before every drive and again before any longer highway outing. Look for sidewall cracking, tread separation, bulges, embedded debris, uneven wear, and pressure loss. Valve stems should also be checked carefully, and any tire or wheel combination using tube-type components deserves extra attention to stem condition and air retention.

A quick inspection is one of the easiest ways to protect an older car from avoidable trouble. The 626, GLC, and RX-7 are all old enough now that long storage intervals, prior wheel changes, and mixed service histories are common. Catching a crack, soft tire, or damaged stem in the garage is far better than discovering it after the car has warmed up at speed or after you are already far from home.

A 1981 Mazda RX-7 would have been a radial-tire car from new, and the sizes associated with the model here are 165R13 and 185/70R13. Both mount on 13-inch rims and reflect the transition-era mix of full-profile metric radials and lower-profile metric radials common in the early 1980s. Original-equipment branding could vary by market and trim, so construction type and size are the more reliable starting points than assuming one universal factory brand.

For restoration work, the key is to confirm which of those two sizes belongs on your particular RX-7 before worrying about cosmetic details. A local marque club, period brochure, or original tire placard can help settle market-specific questions. Once size is confirmed, blackwall radials are generally the most authentic visual direction for a stock-looking first-generation RX-7.

Correct tire fitment absolutely matters when a 1981 Mazda is being judged for originality. Size, construction type, and sidewall appearance all affect whether the car presents as period-correct. On a 1981 Japanese car, a radial blackwall usually aligns more closely with factory-era expectations than a decorative redline or wide whitewall, even if the tire still fits the wheel and clears the body properly.

That does not mean every event follows the same standard. A driver-class car may allow more freedom, while a marque-specific concours could be stricter about sidewall style and the exact size family used on a 626, GLC, or RX-7. Before finalizing a show set, check the event's judging rules and compare them to your car's original-market configuration so the tire choice supports the level of authenticity you want.

For 1981 Mazda applications using 185/70R13, BFGoodrich Silvertown Radial and Avon CR6ZZ take different approaches within the same basic size. BFGoodrich offers redline and wide whitewall versions with a 5.00 to 6.50-inch rim-width range and a stated maximum load of 1,135 pounds at 35 psi. Avon CR6ZZ appears as a blackwall with an H speed rating and a 4.5 to 6.0-inch rim-width range.

The practical difference is visual character and wheel compatibility more than simple fit. A BFGoodrich redline or whitewall changes the personality of a 626 or RX-7 immediately, while the Avon blackwall stays closer to a straightforward sporting look. Before choosing between them, match the tire not only to the car's style goal but also to the actual rim width so the finished setup works mechanically as well as visually.

1981 Mazda tires can be suitable for highway driving when they are the correct size, in sound condition, and used within their rating limits. H-rated examples appear in 165R13, 155R13, and 175/70R13, which corresponds to 130 mph, and a V-rated 185/70R13 option appears as well, which corresponds to 149 mph. Those ratings exceed ordinary U.S. highway speeds, but real-world safety in a 1981 Mazda also depends heavily on the condition of the car's brakes, suspension, steering, and alignment.

The important point is not just the letter on the sidewall but the whole condition of the vehicle and tire package. An older RX-7 or 626 with fresh, properly inflated radials may feel composed at normal road speeds, while a neglected car on aged tires may not. Before any sustained highway use, verify tire age, inflation, and wheel condition, then treat the car's overall mechanical health as equally important.

Inflation pressure for a 1981 Mazda should follow the vehicle's factory guidance first, with the tire maker's rated maximum pressure used only as a tire construction reference rather than a blanket setting. Among these sizes, one 185/70R13 carries a load figure of 1,135 pounds at 35 psi, while Dunlop examples include 1,047 pounds for 165R13 and 937 pounds for 155R13. Those figures are size- and product-specific and should not be transferred from one Mazda fitment to another.

Use the tire placard or owner's manual to establish the vehicle target, then compare that with the sidewall details on the exact tire you are using. This matters because a 626, GLC, and RX-7 do not all place the same load on the same size tire, and even two products in one size may be built with different intended wheel-width ranges. Pressure should be checked cold, not after driving.

Before taking a 1981 Mazda on a longer drive, inspect all four tires and the spare for cracking, cuts, bulges, uneven wear, and proper cold inflation. Check the valve stems, and pay extra attention to any tire or wheel setup that uses tube-type components or has sat unused for a long period. Confirm that the tire size on the car matches the model, since the 626 and RX-7 share different sizes than the GLC.

Tires are only one part of a sensible pre-trip inspection on a car from this era. Wheel fasteners, brake feel, steering response, fluid levels, belts, hoses, and lights deserve the same attention before you head out. A quick garage inspection can prevent roadside frustration, and it is especially worthwhile on a vintage Mazda that may spend far more time stored than driven.