The 1978 MG MGB sits in the final years of one of Britain’s best-known open sports car lines, a car valued for its direct steering, simple mechanical character, and unmistakable roadster feel. Buyers looking after one today are usually balancing driving enjoyment with preservation of the car’s period personality. Tire fitment is refreshingly straightforward, because the 1978 MG MGB uses a 165R14 radial on a 14-inch rim. Within that size, the real choices come down to brand and tire series rather than multiple fitments, with blackwall options from Pirelli, Michelin, and Vredestein. That makes it especially important to match the tire to the car’s intended use, wheel setup, and restoration goals.
Which Tire Size Is Right for The 1978 MG MGB
The 1978 MG MGB uses one primary tire size: 165R14. It is a radial fitment on a 14-inch rim, and the covered GT Coupe sub-model uses the same size, so the decision is less about sorting through multiple factory fitments and more about choosing the right tire within that size. Brand, tire series, rim-width compatibility, and the character you want from the car matter most here.
A 165R14 size uses a 165-millimeter nominal section width, radial construction, and a 14-inch rim diameter. In this format, the aspect ratio is not stated in the size itself, and it is commonly treated as an 80-series style radial, which suits the 1978 MG MGB’s period tire profile. Available choices in this size include blackwall tires from Pirelli, Michelin, and Vredestein across series such as Cinturato CA67, XAS, and Sprint Classic. For an MGB owner, this size keeps fitment focused and lets the choice center on brand character, wheel compatibility, and the kind of road use the car will see.
Sub-model fitment is simple for the covered 1978 MG MGB range. The GT Coupe uses the same 165R14 radial size, so identifying the sub-model matters more for confirming the exact car than for sorting through multiple tire sizes.
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1978 MG MGB GT Coupe
The 1978 MG MGB GT Coupe uses the same 165R14 radial fitment found on the core vehicle. That keeps tire selection centered on choosing the right blackwall radial and confirming wheel width and overall vehicle setup, rather than switching between different primary sizes.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 1978 MG MGB Tires for Sale
Available 165R14 choices for the 1978 MG MGB center on blackwall radial tires from Pirelli, Michelin, and Vredestein. The product grid is most useful for comparing tire series, rim-width specifications where stated, and details such as weight and load-related specifications.
Owners shopping for 1978 MG MGB tires usually want clear answers on 165R14 fitment, 14-inch rim compatibility, brand and series choices, restoration-minded appearance, and the checks worth making before putting a collector-era sports car back on the road.
Tire Size & Fitment
What tire size fits a 1978 MG MGB?
The 1978 MG MGB uses a 165R14 radial tire. That is the primary fitment for this vehicle, and it matches a 14-inch rim. For most buyers, the main question is not which of several sizes applies, but which 165R14 tire best suits the car’s use and presentation.
A correct-size search should still include a quick check of the actual wheels on the car, especially if it has been modified over the years. Confirm the wheel diameter, compare wheel width with the tire’s approved range when stated, and inspect for any suspension or body changes that could affect clearance.
What size rim does a 1978 MG MGB use?
The 1978 MG MGB uses a 14-inch rim with its 165R14 tire size. Rim diameter is the key measurement here, because the tire’s final number, 14, refers to the wheel diameter in inches. The covered fitment stays within that same rim diameter rather than splitting across multiple wheel sizes.
Wheel width still deserves attention before choosing a specific tire. Some 165R14 products include approved rim-width ranges, such as 4.50 to 6.00 inches or 4.0 to 5.5 inches, so the safest approach is to measure the actual wheel and compare it to the tire you are considering.
Does the 1978 MG MGB GT Coupe use the same tire size?
Yes. The 1978 MG MGB GT Coupe uses the same 165R14 radial tire size as the core 1978 MG MGB fitment. That makes sub-model fitment straightforward for the covered configuration, with no separate primary size to sort through for the GT Coupe.
Even with shared sizing, tire selection can still vary by owner priorities. A GT Coupe owner may want a particular tire series, a specific brand, or a rim-width match that suits the wheels currently on the car. It is also smart to confirm that the car has not been changed to aftermarket wheels or a non-stock suspension setup.
Choosing the Right Tire
What should I consider when choosing a 165R14 tire for a 1978 MG MGB?
Start with the essentials: the 1978 MG MGB uses a 165R14 radial on a 14-inch rim, so the tire needs to match that basic fitment. From there, compare brand, tire series, sidewall appearance, rim-width compatibility where stated, and any meaningful specification details such as load information or tire weight.
The best choice depends on how the car is used. A lightly driven collector car, a weekend road car, and a restoration-focused MGB may all point the buyer toward different priorities. Looking closely at wheel width, intended driving style, and the appearance you want on the finished car will narrow the field quickly.
What brands offer tires for the 1978 MG MGB?
The available 165R14 tires for the 1978 MG MGB include products from Pirelli, Michelin, and Vredestein. Those brands cover several well-known vintage and classic-oriented radial lines, including Pirelli Cinturato CA67, Michelin XAS, and Vredestein Sprint Classic, all in blackwall form for this fitment.
Brand choice should be part of a broader comparison rather than a shortcut decision. It helps to look at the exact tire series, the stated rim-width range when available, and whether the tire’s character fits the way the car is driven. Keeping those points in view is more useful than choosing by brand name alone.
What tire series are available for the 1978 MG MGB?
The 1978 MG MGB’s 165R14 fitment is available in several distinct tire series, including Pirelli Cinturato CA67, Michelin XAS, and Vredestein Sprint Classic. All are radial blackwall options, but the series names matter because they help distinguish the products beyond simple size and construction.
Comparing tire series is a good way to narrow the choices once size is settled. Buyers should review wheel compatibility, any stated load-related specification, and the overall look each series gives the car. That approach makes more sense than treating every 165R14 radial as the same simply because the size matches.
Restoration & Appearance
Which tire should I choose for a period-style 1978 MG MGB?
A period-style 1978 MG MGB tire choice starts with the correct primary fitment, which is 165R14 in radial construction. From there, the most relevant options are classic-oriented blackwall tires such as the Pirelli Cinturato CA67, Michelin XAS, and Vredestein Sprint Classic, each of which keeps the car within a traditional-looking size and format.
Appearance-focused buyers should compare the overall character of the tire series as closely as the specifications. For a restoration where exact originality matters, marque references and model-specific historical guidance are still worth consulting. That extra step helps separate a strong period-style choice from a claim of exact factory originality.
Does correct tire fitment matter for a 1978 MG MGB restoration?
Yes, correct tire fitment matters because tire size has a strong effect on how a restored 1978 MG MGB looks and sits on the road. Staying with the proper 165R14 radial keeps the car within the intended sizing framework and avoids the visual mismatch that can happen when a modern substitute changes the tire’s proportions.
Restoration-minded fitment is about more than appearance alone. Wheel width, overall clearance, and the tire’s sidewall shape all influence the finished result, even when the nominal size is correct. A careful check of the actual wheel and vehicle setup helps preserve both the look and the usability of the restored car.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1978 MG MGB?
Yes. A 1978 MG MGB may use the correct 165R14 size on paper, but aftermarket wheels, changed wheel offset, lowered suspension, replacement springs, or body alterations can all affect real-world fitment. Those changes can influence clearance at the fender, suspension, and steering components even when the tire size itself remains unchanged.
A modified car should be checked as it sits, not just by original specifications. Measure the wheel diameter and width, inspect steering travel and suspension clearance, and look for signs of rubbing on the inner wheelhouse or outer fender. That is especially important on older sports cars that may have seen decades of owner changes.
What should I inspect before driving a 1978 MG MGB on new tires?
Before driving a 1978 MG MGB on new tires, inspect the wheels for correct diameter and condition, confirm the tires are seated properly, and verify inflation pressure for the chosen tire and vehicle setup. It also makes sense to check lug hardware, valve stems, and basic alignment-related signs if the old tires showed uneven wear.
Collector-era cars deserve a broader once-over before road use. Look at suspension bushings, steering components, wheel bearings, and brake condition, then check for any interference at full lock and normal ride height. A short, careful test drive is the best way to confirm that the new 165R14 tires behave properly on the car.
How should 165R14 tires on a collector 1978 MG MGB be maintained?
165R14 tires on a collector 1978 MG MGB should be inspected regularly for pressure loss, tread wear, sidewall cracking, bulges, cuts, and any signs of age-related deterioration. Cars that spend long periods parked often need more attention than frequently driven cars, because time and storage conditions can affect tires even when mileage stays low.
Good maintenance also means protecting the tires between drives. Keep the car stored away from prolonged sunlight, excess moisture, and ozone-producing equipment, and move or drive it often enough to avoid long-term flat spotting. An occasional wheel and alignment check can also help the tires wear evenly and stay road-ready.
