1948 MG captured the spirit of the immediate postwar British sports car: light, direct, and built for drivers who valued nimble handling over sheer size or luxury. In that year, the MG range represented here centers on the Midget, a compact open car whose tire choice plays a visible role in both stance and character. For 1948 MG, one tire size serves the full model range covered here, so the real choice is less about fitment differences between models and more about selecting the right bias-ply tire style for authenticity, road use, or competition flavor. Start by confirming your model and 19-inch wheel setup, then choose the version of 450-19 that suits how your car is used.
Which Tire Size Is Right for Your 1948 MG
One tire size is available for 1948 MG, and it is shared across the full model range covered here. That makes the decision more straightforward: fitment stays consistent, while the real choice comes down to the kind of bias-ply tire you want on the car and how closely you want to match period character. Understanding that distinction before choosing a product saves time and helps you match the tire to the car's intended use.
Year(s): 1948|Fit(s): Midget|Construction: Bias Ply|Rim: 19 in
450-19 is a numeric bias-ply size in which 4.50 refers to nominal section width and 19 refers to the wheel diameter in inches. This size is offered in Excelsior and Ensign lines, all with blackwall styling, and the available products stay within bias-ply construction with rim-fit guidance ranging from 2.50 to 3.00 inches on some versions and 3.5 inches on the Comp H. For a 1948 MG Midget, this is the universal fitment size, so the practical decision is choosing the version that best matches your restoration goals, road use, or period competition look.
One model is covered for 1948 MG. Because the tire size is shared rather than split by model, identification is simple at the year-make level, and the finer decision becomes the kind of bias-ply presentation and driving character you want from the tire itself. Select the model below for model-specific fitment history and product options.
1948 MG Midget
The 1948 MG Midget carries the classic MG formula of a small, lightweight British sports car with strong enthusiast appeal in vintage touring and restoration circles. Its tires mount on 19-inch wheels, giving the car the tall, narrow profile that suits its late-1940s appearance and steering feel.
Four products are available across one tire size for 1948 MG vehicles. In 450-19, Excelsior and Ensign offer bias-ply blackwall tires in several series, giving MG owners a choice of period-style options within the same fitment.
These answers focus on 1948 MG tire sizing, what 450-19 means, how bias-ply choices affect restoration and driving character, and what to inspect before fitting or using a lightly driven postwar British sports car.
Size Basics & Fitment
What tire sizes fit 1948 MG vehicles?
1948 MG vehicles covered here use one tire size: 450-19. That size applies to the 1948 MG Midget, and it mounts on a 19-inch wheel. Available fitment guidance within the current product range includes rim widths of 2.50 to 3.00 inches on some versions, with one competition-oriented version listed for a 3.5-inch rim.
Because there is only one size in use here, most owners will not be choosing between different overall fitment sizes. The important next step is confirming that your wheels match the intended rim width range of the tire version you are considering, especially if the car has been restored, modified, or fitted with specialty wheels at some point in its life.
What does 450-19 mean on a 1948 MG tire?
On a 1948 MG tire, 450-19 is a numeric bias-ply size. The 4.50 figure refers to the tire's nominal section width in inches, and the 19 refers to the wheel diameter in inches. It is an older sizing convention commonly seen on prewar and immediate postwar cars, especially light British sports cars and small-displacement specialty vehicles.
That code tells you the tire belongs to an earlier sizing system rather than a modern metric one. If you are comparing replacement options, keep your attention on the exact 450-19 size and the tire's intended rim-width range instead of trying to translate it loosely into a modern radial size, since appearance, steering feel, and fit can change noticeably when the format changes.
Do all 1948 MG models use the same tire size?
Yes. The 1948 MG model covered here, the Midget, uses 450-19 throughout this year-make grouping. There is no split here between multiple sizes or multiple rim diameters, so the basic fitment path is simpler than it is on many larger makes with sedan, coupe, and commercial variants sharing the same year.
That does not mean every 450-19 tire is identical in character. Even within one size, owners may still compare brand, series, sidewall presentation, and wheel-width suitability to find the right match for a restoration, vintage touring car, or more competition-flavored build. Once you know your car is a 1948 MG Midget on 19-inch wheels, the focus shifts from size selection to product selection.
Buying the Right Tire
What sidewall styles are available for 1948 MG tires?
1948 MG tires in 450-19 are offered here in blackwall form. That sidewall look suits the understated, sporting appearance expected of an immediate postwar MG and aligns well with the way many British sports cars of the period are restored and presented today.
For an owner concerned with appearance as much as fitment, blackwall is the visual baseline to work from on a 1948 MG Midget. The remaining choice is really between the tire lines themselves rather than between whitewall and blackwall treatments, so it makes sense to compare the overall character of each series and how closely it matches your goals for show presentation or active use.
What brands make tires for 1948 MG vehicles?
1948 MG vehicles in 450-19 are served here by Excelsior and Ensign. Both brands are represented in bias-ply construction, and both are offered in blackwall form for the period-correct tall, narrow profile that suits a late-1940s MG Midget.
Brand choice matters less as a simple badge decision than as a way to narrow down the style of tire you want on the car. An owner comparing Excelsior and Ensign should look at the specific series within 450-19, along with wheel-width suitability and the visual tone of the tire, since those details will influence how the finished car looks and feels on the road.
What is the difference between Excelsior Comp H and Ensign B5 for the 1948 MG?
Excelsior Comp H and Ensign B5 are both 450-19 bias-ply blackwall tires for 1948 MG applications, but they are presented differently in the available specifications. Ensign B5 includes a listed maximum load of 715 pounds at 36 psi and a rim-width range of 2.5 to 3.0 inches, while Excelsior Comp H is listed for a 3.5-inch rim. Their listed weights also differ, with Ensign B5 at 20 pounds and Excelsior Comp H at 18 pounds.
That comparison points buyers toward wheel compatibility and intended character rather than simple interchangeability. If your MG retains a narrower wheel setup, the B5's stated rim-width range gives a clear starting point. If you are considering a more competition-flavored presentation, the Comp H deserves a closer look, but wheel width should be confirmed first so the tire matches the actual rim on the car.
Fitting & Setup
What rim width do 1948 MG tires require?
1948 MG tires in 450-19 are shown with more than one rim-width fitment range depending on the product. Some 450-19 versions are specified for 2.50 to 3.00 inch rims, while the Excelsior Comp H version is listed for a 3.5-inch rim. All of them fit a 19-inch wheel diameter, but the acceptable rim width changes by tire line.
That makes wheel measurement worth doing before you settle on a specific tire. A car that still wears original-style narrow wheels may point you toward one group of 450-19 products, while a car prepared for vintage competition or altered with wider rims may better suit another. Matching the tire to the actual wheel helps preserve proper profile, footprint, and sidewall shape.
Do 1948 MG tires require inner tubes?
The currently available 450-19 tires for 1948 MG do not carry a tube-type or tubeless marking in the listed size information here, so the practical decision should be made by the wheel design and the specific tire's sidewall instructions. On a car of this era, many owners and restorers treat tube fitment as part of the overall wheel-and-tire setup rather than assuming a modern tubeless arrangement.
A 1948 MG Midget often runs on period-style wheels where tube use may be appropriate even when the tire listing itself is not explicit. Before final installation, inspect the wheel condition, verify the valve-hole arrangement, and check the exact marking on the tire you intend to use. That is the safest way to avoid making a blanket assumption from size alone.
Maintenance, Storage & Longevity
How should I store a 1948 MG when the tires are fitted?
A 1948 MG should be stored in a cool, dry area away from direct sunlight, ozone-producing equipment, and standing moisture. Bias-ply tires are especially prone to flat-spotting when left in one position for long periods, so the car benefits from occasional rolling movement or, for longer storage intervals, careful support that reduces constant load on the tires.
Storage habits matter on a lightweight postwar sports car because the tires are a major part of how the car feels once it is back on the road. Keep inflation pressures checked during storage, avoid resting the tires on oil-soaked or damp surfaces, and inspect sidewalls before the first drive of the season so minor age cracking or shape change does not surprise you after months of inactivity.
How long do tires on a 1948 MG typically last?
Tires on a 1948 MG should be judged more by age and condition than by mileage. On collector vehicles that are driven lightly, a useful rule is to evaluate tires closely once they are about five to seven years old and to treat around ten years as a point where replacement deserves serious consideration, regardless of remaining tread depth.
A low-mileage MG can still be riding on aged rubber that looks acceptable at a glance but has hardened or begun to crack internally. Check the date code on the tire if present, inspect the sidewalls and tread base for weathering, and consider how the car is used. An occasional show lawn life is different from regular road miles, but age still matters in both cases.
How often should tires on a 1948 MG be inspected?
Tires on a 1948 MG should be inspected before every drive and again before any longer outing. Focus on pressure retention, visible cracking, tread wear, cuts, bulges, and any sign that the tire has shifted or seated poorly on the wheel. Because these are bias-ply tires on a vintage application, a brief visual check is especially worthwhile after storage or after the car has sat for several weeks.
A careful inspection routine helps catch age-related issues before they become roadside problems. If your wheel-and-tire setup uses tubes, include the valve stem and surrounding area in that inspection rather than looking only at the tread and outer sidewall. Collector cars often spend more time parked than driven, so deterioration can progress quietly between otherwise short trips.
Restoration & Authenticity
What tires were originally fitted to the 1948 MG Midget?
A 1948 MG Midget would have been associated with bias-ply tire construction in period, and the 450-19 size aligns with that immediate postwar British sports car character. Modern reproduction options in this size stay within the correct bias-ply format and preserve the tall, narrow proportions expected on a late-1940s MG.
Owners pursuing factory-style authenticity should focus first on matching the original size and construction, then refine the choice by sidewall appearance and brand family. If your car is judged in marque-specific events, it is wise to confirm market and production-period details with MG clubs or restoration references, since event standards can be more exacting than general period-correct practice.
Does correct tire fitment matter for showing a 1948 MG?
Correct tire fitment matters on a 1948 MG because judges and knowledgeable enthusiasts notice size, construction, and overall visual proportion immediately. A proper 450-19 bias-ply tire supports the car's original stance and preserves the lean, upright look associated with postwar MG sports cars.
A mismatch in construction or profile can stand out even to casual observers, especially on a small open car where the tire and wheel are visually prominent. Owners preparing for concours or marque events should treat the tire as part of the restoration story, not just a consumable part, and confirm that the chosen series and sidewall appearance fit the standard expected for the class they intend to enter.
What is the difference between Excelsior Bias Ply and Ensign Triple Road Race for the 1948 MG?
Excelsior Bias Ply and Ensign Triple Road Race are both offered in 450-19 for 1948 MG applications, and both retain blackwall bias-ply construction. Their listed weights are the same at 18 pounds, but they differ in series identity and presentation, which can matter to an owner choosing between a more general period-style replacement and a tire with a stronger competition-oriented name and character.
That distinction is useful when the goal is not merely to fit the car, but to finish it in a way that matches its intended personality. A road car restored in a broadly factory-style manner may lead one owner in one direction, while a supercharged, competition-themed, or vintage-event-focused MG may lead another elsewhere. The final choice should still be checked against actual wheel dimensions before installation.
Safety & Road Use
Are 1948 MG tires safe for highway driving?
1948 MG tires in 450-19 are bias-ply tires, and bias-ply construction can be used on the road when the tires are in sound condition, properly inflated, and matched to suitable wheels. No speed ratings are shown here for these products, so the practical limit on a 1948 MG is often shaped as much by the car's own age, brakes, steering, suspension, and overall mechanical state as by the tire alone.
For ordinary collector-car use, a well-prepared MG on fresh, correctly fitted tires can be driven confidently within the car's normal operating envelope. The sensible approach is to build speed gradually after installation, pay attention to steering feel and vibration, and remember that a late-1940s sports car rewards measured touring far more than modern high-speed expectations.
What inflation pressure should I use for 1948 MG tires?
Inflation pressure on 1948 MG tires should follow the vehicle manufacturer's original guidance for the car's service condition, with the tire's own rated pressure treated as a structural limit rather than a universal running recommendation. Within the available 450-19 products, one listed figure is 715 pounds at 36 psi for the Ensign B5, but that number should not be transferred automatically to every 450-19 tire in the range.
The best practice is to begin with the MG factory recommendation for normal use, then confirm that your chosen tire's sidewall information aligns with that application. On a light sports car, a few pounds of pressure can noticeably change ride and steering response, so pressure should be checked cold and adjusted carefully rather than estimated by appearance alone.
What should I check before taking a 1948 MG on a longer drive?
Before a longer drive in a 1948 MG, inspect each tire for cracking, cuts, bulges, uneven wear, and proper inflation, and include the spare in that check. Pay attention to valve stems, wheel condition, and any sign that a bias-ply tire has developed a flat spot after storage. A quick test drive close to home is also useful if the car has been parked for an extended period.
Tires are only one part of the readiness picture on a postwar MG, but they are one of the easiest places to prevent trouble before it starts. Once the tires are confirmed, move on to the broader mechanical basics that matter on an older sports car: brakes, steering free play, fluid levels, wheel fasteners, and overall roadworthiness. A careful inspection preserves both safety and enjoyment.
