1977 MG Tire Fitment Guide

1977 MG vehicles use two different tire sizes depending on model. The 1977 MG MGB uses 165R14 radial tires on 14-inch rims, while the 1977 MG Midget uses 145R13 radial tires on 13-inch rims. For 165R14, published rim-width ranges include 4.0 to 5.5 inches and 4.50 to 6.00 inches depending on the product. For 145R13, published rim-width guidance includes 4.00 to 5.00 inches on applicable products.

That means year and make alone are not enough to choose correctly. An MGB owner should start with 165R14 products, and a Midget owner should start with 145R13 products, then confirm the actual wheel width before settling on a specific tire. If your car has been modified over the years, checking the wheel itself is especially worthwhile before moving ahead.

On a 1977 MG, 165R14 is a euro-metric radial size. The 165 refers to a nominal section width of 165 millimeters, the R indicates radial construction, and the 14 is the wheel diameter in inches. When no aspect ratio is printed in this older European format, it is conventionally treated as an 80-series radial. In this year-make combination, 165R14 belongs to the MGB.

That decoding matters because 165R14 is not interchangeable with the Midget's 145R13 fitment. It points you toward a taller, wider tire built for a 14-inch wheel, and it also opens the door to period-style European radial lines such as Michelin, Pirelli, and Vredestein. Once you know your car is an MGB, the next comparison is brand, speed marking, and wheel-width compatibility.

On a 1977 MG, 145R13 is a euro-metric radial size used on the Midget. The 145 indicates a nominal section width of 145 millimeters, the R denotes radial construction, and the 13 identifies a 13-inch wheel diameter. As with other older euro-metric sizes that omit the profile, it is conventionally understood as an 80-series radial. This is the smaller of the two 1977 MG fitments.

That smaller code is a quick way to separate Midget tires from MGB tires. It keeps you in the proper 13-inch category and avoids accidentally moving into the wider 14-inch MGB fitment. If your Midget still has stock-style wheels, 145R13 is the correct starting point, then the practical comparison becomes brand character, sidewall marking, and whether the individual tire is marked tubeless.

No. The 1977 MG MGB uses 165R14, and the 1977 MG Midget uses 145R13. Both are radial tires, but they mount on different wheel diameters and are sized differently in section width as well. There is no single all-model fitment across the 1977 MG range.

That model split is the most important fitment fact on this page. If you know only that you have a 1977 MG, you still need to identify whether it is an MGB or a Midget before selecting a tire. Once the model is confirmed, the choices become much narrower and more meaningful, especially if your goal is to preserve the way the car sits, steers, and looks.

1977 MG tires in both 165R14 for the MGB and 145R13 for the Midget are available in blackwall form. That means the current choices stay visually close to the understated European sports-car look these cars are known for, rather than moving into wide whitewall or decorative sidewall treatments more commonly associated with American classics from earlier decades.

For most 1977 MG restorations and driver-quality cars, blackwall is the appearance most owners expect to see. The decision is therefore less about sidewall decoration and more about choosing the right model-specific size, then comparing the individual tire's construction details, speed marking, and wheel-width suitability. If you are building toward show-level originality, a marque club can help you confirm market-specific presentation standards.

Several established brands cover 1977 MG fitments. The 165R14 size used on the MGB is available from Pirelli, Michelin, and Vredestein, while the 145R13 size used on the Midget is available from Michelin and Firestone. All of these choices are radial tires, and all are offered with blackwall sidewalls for this year-make combination.

That brand spread gives MG owners a meaningful choice within the correct original-style sizing rather than forcing a jump to modern oversize alternatives. MGB owners have the broader range, while Midget owners have a tighter but still credible selection. Once you have the correct size nailed down, compare the individual tire's speed symbol, wheel-width guidance, and overall visual character to decide which one best fits your car's intended use.

For the 1977 MG MGB's 165R14 size, both the Michelin XAS and Vredestein Sprint Classic are radial blackwall tires with an H speed rating, which corresponds to a 130 mph ceiling. The Michelin XAS is marked 165HR14 84H TL and carries a published rim-width range of 4.50 to 6.00 inches. The Vredestein Sprint Classic is also an H-rated 165HR14, with a published rim-width range of 4.0 to 5.5 inches and a maximum load figure of 1,102 pounds at 51 psi.

Those details make the choice more about wheel compatibility and product character than about broad fitment. If your MGB has wheels at the wider end of the usual range, the Michelin's published fit window reaches farther. If your wheels are narrower, the Vredestein's range may align more naturally. Either way, confirm the actual wheel width on your car before choosing between them.

Rim-width guidance varies by size and by product. For 1977 MG MGB applications in 165R14, published fit ranges include 4.0 to 5.5 inches on one tire and 4.50 to 6.00 inches on another. For 1977 MG Midget applications in 145R13, a published fit range of 4.00 to 5.00 inches appears on applicable products. Both model-specific sizes also require their own correct rim diameter: 14 inches for MGB and 13 inches for Midget.

The practical step is to verify both wheel diameter and wheel width before you settle on a specific tire. Two tires in the same nominal size can carry different approved rim-width ranges, so the right answer is not just the size code alone. Measuring the wheel or checking the wheel stamp is time well spent, especially on cars that may have changed wheels during past restorations.

Inner-tube requirements vary by product rather than staying uniform across all 1977 MG tires. The Michelin XAS in 165R14 and the Michelin XAS FF in 145R13 are marked TL, indicating tubeless construction. Other products in those sizes do not carry the same tube marking in their size description, so tube status should be confirmed on the exact tire you choose and matched to the wheel you plan to use.

That matters because tire construction and wheel design need to work together. A tubeless-marked tire on a sound tubeless wheel is a different setup from a tire fitted to an older wheel that may still be used with tubes for sealing or restoration reasons. Before final fitment, check the tire's own sidewall marking and make sure the valve-stem and wheel condition suit the setup you intend to run.

A 1977 MG should be stored clean, dry, and out of direct sunlight, with the tires kept away from ozone sources such as electric motors, battery chargers, and welders. Maintain inflation while the car sits, and move it periodically if possible so one section of the tire is not supporting the same load for months at a time. Radials generally tolerate storage better than older bias-ply designs, but long static periods still age the casing and sidewalls.

If the car will sit for an extended season, many collectors either roll it occasionally or support it in a way that reduces sustained load without leaving the suspension hanging unnaturally. That is especially worthwhile on a lightweight sports car that may spend much of its life parked between events or fair-weather drives. A breathable cover and stable indoor temperature help the tires age more gracefully.

Tires on a 1977 MG are usually judged by age and condition more than by miles alone. A collector car tire deserves close evaluation once it reaches roughly five to seven years of age, and many owners begin serious replacement consideration as it approaches ten years, even if tread depth still looks serviceable. The DOT date code on the tire sidewall is the best starting point for determining age.

That approach fits MG ownership well, because many MGBs and Midgets are driven lightly and can carry old-looking-good rubber longer than they should. A low-mileage tire can still harden, crack, or lose flexibility with time. If you have recently acquired the car and do not know the tire age, checking the date code should happen before any ambitious road use.

Tires on a 1977 MG should be inspected before every drive, and again more carefully before any longer outing. Look for sidewall cracking, tread separation, punctures, bulges, uneven wear, and any pressure loss since the last drive. Because some 1977 MG tire options are marked tubeless while tube use can depend on wheel choice, it is also wise to pay attention to valve-stem condition and air retention over time.

Frequent inspection matters on older sports cars because they are often driven intermittently, then asked to perform at road speed after weeks or months of sitting. A quick visual check catches most age-related issues before they become a roadside problem. If the car starts to pull, vibrate, or feel unusually vague, stop and inspect the tires before assuming the problem is elsewhere.

A 1977 MG MGB would have been associated with radial tire fitment in period, and the correct size for this year is 165R14. That aligns with the late-1970s European move toward radial construction as standard equipment on sports cars of this type. Blackwall presentation also suits the MGB's era and market character. Brand choice could vary by market and supply, so the most defensible originality point is correct size, construction, and sidewall appearance rather than assuming one universal original brand.

For a restoration, that means starting with the proper 165R14 radial and then refining the choice according to how strict the car's judging environment will be. Regional delivery differences and dealer practices can complicate one-size-fits-all originality claims. If you are preparing an MGB for serious concours work, a marque club or factory-literature source is the right place to confirm market-specific details before final selection.

Correct tire fitment matters on a 1977 MG because judges and knowledgeable enthusiasts notice size, construction, and sidewall presentation quickly. On these cars, the right model-specific size is part of the car's stance and visual balance: 165R14 for the MGB and 145R13 for the Midget. Blackwall radial tires are also in keeping with the late-1970s British sports-car look, while an obviously incorrect diameter or width can stand out immediately.

Even if a show is not formal concours, proper tire fitment usually improves authenticity and helps the car look settled rather than improvised. A judge or buyer may overlook minor cosmetic flaws more readily than a visibly wrong tire size that changes the whole profile of the car. For event-specific standards, especially at marque-level judging, consult the club rulebook or a respected MG specialist before finalizing your setup.

For the 1977 MG Midget's 145R13 fitment, the Michelin XAS FF and Firestone F560 Radial Tire are both blackwall radials, but they differ in the details. The Michelin is marked 145HR13 74H TL, giving it an H speed rating with a 130 mph ceiling and a tubeless marking. The Firestone is marked simply 145R13, carries a published rim-width range of 4.00 to 5.00 inches, and has a maximum load figure of 825 pounds at 44 psi.

Those differences make them distinct choices for an owner trying to balance authenticity, wheel compatibility, and intended road use. The Michelin carries the fuller period European-style performance marking, while the Firestone contributes useful published setup figures around load and rim width. If your Midget restoration is detail-oriented, compare the sidewall markings you prefer and confirm that your wheel width matches the tire you choose.

1977 MG tires can be appropriate for highway driving when they are the correct size, in good condition, and inflated properly. Among the products carrying speed symbols, the H rating appears on both 165R14 and 145R13 options, and H corresponds to a 130 mph ceiling. That rating is well above ordinary U.S. highway speeds, although a 1977 MG's overall roadworthiness also depends heavily on the condition of its brakes, steering, suspension, and wheel bearings.

The practical takeaway is that tire safety is part of the whole-car equation on an older British sports car. A fresh, properly fitted radial is only one piece of the picture if the car has sat for years or still wears aging suspension parts. Before any sustained highway trip, make sure the tire age, inflation, balance, and general mechanical condition all support the way you intend to drive the car.

Inflation pressure on a 1977 MG should be guided first by the factory recommendation for the specific model, then checked against the tire manufacturer's own maximum-pressure marking. Some current tires also publish pressure in relation to load. For example, one 165R14 tire carries a maximum load of 1,102 pounds at 51 psi, while one 145R13 tire carries 825 pounds at 44 psi. Those figures are tire limits tied to that particular product, not universal running pressures for every 1977 MG tire.

That distinction is important because overinflating to the sidewall maximum can change ride and handling on a light sports car. Start with the original owner's manual or factory placard for the car itself, then make sure your chosen tire's operating range supports that use. If you change brands within the same size, recheck the sidewall and manufacturer guidance instead of assuming the previous settings carry over unchanged.

Before a longer drive in a 1977 MG, inspect all four tires and the spare for cracking, cuts, bulges, uneven wear, and proper inflation. Confirm that the size on the car matches the model—165R14 for an MGB or 145R13 for a Midget—and look over the valve stems and wheel condition as part of the same check. If your chosen tire or wheel setup involves tubeless markings or possible tube use, make sure air retention has been stable before you leave.

That tire check should happen alongside the broader basics expected of a 1970s British sports car: fluids, cooling, charging, lights, and brake feel. These cars reward preparation, and a short walk-around often catches small issues before they become a ruined outing. On a longer trip, it is also wise to bring the tools and spares you would reasonably want if a puncture or slow leak turns up away from home.