The 1931 Gardner 148 comes from the final years of an American luxury marque known for building refined, low-production automobiles in the Classic Era. For owners today, that makes tire selection less about modern upsizing and more about preserving the car’s stance, wheel fitment, and proper road presence. This model uses bias-ply tire sizes in both numeric and flotation-style formats, with fitment split between 19-inch and 18-inch wheel applications depending on sub-model. Available choices also vary by sidewall presentation, including blackwall, wide whitewall, and double-whitewall styles. The key is confirming the exact wheel setup first, then choosing the tire style that best suits restoration goals and intended driving use.
Which Tire Size Is Right for The 1931 Gardner 148
The 1931 Gardner 148 uses four primary tire sizes, and the correct choice depends first on the exact sub-model and wheel diameter. The main split is between 19-inch and 18-inch applications, with each sub-model also showing both a numeric bias-ply size and a flotation-style size, so wheel confirmation matters before comparing tire style or product options.
29X5.50 is an antique diameter-by-section size, where the first number refers to the tire’s approximate overall diameter in inches and the second number refers to section width. It is a bias-ply fitment used on the 1931 Gardner 148 8 Cyl. and reflects an earlier sizing convention often seen on Classic Era cars. Product offerings for this Gardner are concentrated in the matching numeric size rather than this flotation-style expression, so this size is most useful as a fitment reference when confirming the car’s wheel and restoration direction. It helps identify the traditional tire profile associated with the 19-inch application.
550-19 is a numeric bias-ply size in which the 550 designates an approximate 5.50-inch nominal section width and the 19 identifies the rim diameter. On the 1931 Gardner 148, this is one of the practical replacement sizes for the 8 Cyl. configuration using 19-inch wheels. Available choices include BFGoodrich options in Silvertown Classic Bias Ply trim with both blackwall and wide whitewall sidewall treatments. This size gives a buyer a clear path when the goal is maintaining a traditional bias-ply look while selecting the sidewall presentation that best matches the car’s finish and use.
28X5.50 is another antique diameter-by-section size, using overall diameter first and section width second rather than the later rim-based sizing style. It is a bias-ply fitment associated with the 1931 Gardner 148 8 Cyl. w/Disc Wheels and corresponds to the 18-inch wheel application on that sub-model. Product choices are represented more fully in the matching numeric size, so this designation is especially helpful when confirming what is already on the car and comparing it to replacement options. It points the buyer toward the correct wheel group before narrowing the choice by brand or sidewall style.
550-18 is a numeric bias-ply size with a nominal 5.50-inch section width and an 18-inch rim diameter. For the 1931 Gardner 148 8 Cyl. w/Disc Wheels, this is the size with the broadest visible product choice, including offerings from Excelsior, Firestone, BFGoodrich, and Michelin. Sidewall treatments include blackwall, wide whitewall, and double-whitewall, with tire series such as Comp H, Firestone Classic Bias Ply, Silvertown Classic Bias Ply, and Double Rivet. This is the size to study closely when the car has 18-inch disc-wheel fitment and the decision centers on appearance, rim compatibility, and period-style presentation.
Sub-model fitment matters on the 1931 Gardner 148 because the covered configurations do not share the same wheel diameter. One version uses 19-inch tire applications, while the disc-wheel version uses 18-inch applications, so identifying the exact sub-model is the first step before choosing a replacement tire.
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1931 Gardner 148 8 Cyl.
The 1931 Gardner 148 8 Cyl. uses bias-ply tire fitments associated with the 19-inch wheel application, expressed as both 29X5.50 and 550-19. That makes wheel confirmation especially important, then the decision shifts to whether the car is being kept in a more understated blackwall presentation or a restoration-oriented whitewall look.
The 1931 Gardner 148 8 Cyl. w/Disc Wheels uses the 18-inch bias-ply fitment family, shown as 28X5.50 and 550-18. This version has the broader visible product assortment, so once the disc-wheel setup is confirmed, the buyer can compare brands, tire series, and sidewall styles more closely.
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 1931 Gardner 148 Tires for Sale
Available 1931 Gardner 148 tire choices center on 550-19 and 550-18 bias-ply products from BFGoodrich, Firestone, Excelsior, and Michelin. The main differences are tire series, rim-width compatibility, and sidewall presentation, with blackwall, wide whitewall, and double-whitewall styles represented.
Owners of a 1931 Gardner 148 usually need to sort out exact tire size, 18-inch versus 19-inch wheel fitment, bias-ply construction, and the appearance differences between blackwall and whitewall options before making a final choice.
Tire Size & Fitment
What tire size fits a 1931 Gardner 148?
The 1931 Gardner 148 uses four primary bias-ply sizes across the covered configurations: 29X5.50, 550-19, 28X5.50, and 550-18. The 8 Cyl. application is tied to the 19-inch group, shown as 29X5.50 and 550-19, while the 8 Cyl. w/Disc Wheels application uses the 18-inch group, shown as 28X5.50 and 550-18.
The first step is identifying which sub-model and wheel setup the car actually has. Because this Gardner uses both 18-inch and 19-inch applications, the correct tire choice starts with wheel diameter confirmation, then moves to the appropriate size expression and the sidewall style or tire series that suits the car’s restoration and driving plans.
What size rim does a 1931 Gardner 148 use?
A 1931 Gardner 148 can use either a 19-inch or 18-inch rim, depending on the sub-model. The 8 Cyl. application is associated with the 19-inch fitment family, while the 8 Cyl. w/Disc Wheels application is associated with the 18-inch fitment family.
That difference is important because a 550-19 tire and a 550-18 tire are not interchangeable just because the section width is similar. Measure the wheel diameter on the car and confirm whether it matches the sub-model before comparing brands, sidewall styles, or tire series, especially if the vehicle has had wheel changes during its restoration life.
Do all 1931 Gardner 148 sub-models use the same tire size?
No. The covered 1931 Gardner 148 sub-models split into two fitment groups. The 8 Cyl. uses 29X5.50 and 550-19, while the 8 Cyl. w/Disc Wheels uses 28X5.50 and 550-18, so the tire size is not the same across both versions.
That means the sub-model name alone is not enough if the car has been modified or restored over many decades. It is worth checking the actual wheel diameter and the size currently mounted before ordering replacement tires, since the Gardner’s tire choice depends on matching the vehicle’s present wheel setup rather than assuming all 1931 148 models share one tire.
Choosing the Right Tire
What should I consider when choosing a 550-18 tire for a 1931 Gardner 148?
Start by confirming that the car is the 18-inch disc-wheel application, since 550-18 belongs to the 1931 Gardner 148 8 Cyl. w/Disc Wheels fitment group. From there, compare bias-ply products by brand, tire series, sidewall style, and rim-width specification, because the available 550-18 choices include several different presentations rather than one uniform tire.
This size is offered in blackwall, wide whitewall, and double-whitewall form, so appearance can change the character of the car as much as the brand name does. It also helps to compare rim-width compatibility and load figures where shown, then match those details to the wheel on the car and the way the Gardner will actually be used.
What sidewall styles are available for 1931 Gardner 148 tires?
Sidewall choices for the 1931 Gardner 148 include blackwall and wide whitewall in both 550-19 and 550-18 applications, with double-whitewall also available in 550-18. Those differences matter because the tire sidewall is a large visual element on a Classic Era car, especially with exposed fenders and tall-profile bias-ply sizing.
A blackwall tire gives a more restrained and utilitarian presentation, while wide whitewall and double-whitewall styles create a more formal restoration look. The best choice depends on how the car is being finished and how authentic or expressive the owner wants the appearance to feel, provided the selected tire still matches the correct wheel diameter and size group.
What brands offer tires for the 1931 Gardner 148?
Available tire brands for the 1931 Gardner 148 include BFGoodrich, Firestone, Excelsior, and Michelin, depending on the exact size. The 550-19 selection is centered on BFGoodrich, while 550-18 opens a broader range that includes Firestone, Excelsior, BFGoodrich, and Michelin across several bias-ply series.
Brand choice should be considered alongside the actual fitment group rather than as a separate first decision. Once the correct 18-inch or 19-inch application is confirmed, compare each brand’s available sidewall style, tire series, and rim-width specification so the final choice matches both the Gardner’s wheel setup and the visual direction of the car.
Restoration & Appearance
Which tire should I choose for a period-style 1931 Gardner 148?
A period-style 1931 Gardner 148 starts with staying in the correct bias-ply size family for the car’s actual wheel setup. That means choosing from the 19-inch group for the 8 Cyl. application or the 18-inch group for the disc-wheel application, then narrowing the choice by sidewall style and tire series rather than moving away from the original-style construction.
For many restorations, the visual decision comes down to blackwall versus whitewall treatment and how formal the finished car is meant to appear. If exact historical authenticity matters beyond general period style, compare the chosen tire appearance against marque references, restoration photos, and other vehicle-specific documentation before finalizing the tire selection.
How does tire construction affect the appearance of a restored 1931 Gardner 148?
On a restored 1931 Gardner 148, bias-ply construction strongly influences the car’s visual character because these tires carry the tall, narrow proportions associated with early 1930s fitment. Since the Gardner’s primary applications here are all bias-ply, construction and sidewall design work together to shape how formal, understated, or touring-oriented the finished car looks.
That visual effect becomes especially noticeable when comparing blackwall, wide whitewall, and double-whitewall offerings in the supported sizes. Even when the size is correct, a different sidewall treatment can change the entire stance and personality of the car, so appearance should be considered alongside wheel diameter, sub-model fitment, and intended road use rather than as an afterthought.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1931 Gardner 148?
Yes. Modifications can affect tire fitment on a 1931 Gardner 148, especially if the car has had wheel changes, brake updates, altered ride height, or body and fender work over the years. Because this model already spans both 18-inch and 19-inch applications, even a subtle change in wheel setup can move the car away from its original tire group.
A careful check should include actual wheel diameter, wheel width, and visible clearance at the fender and steering range before choosing replacement tires. On an older restoration, it also helps to inspect whether the current tire size matches the wheels on the car, rather than assuming the sub-model designation still tells the whole story.
What should I inspect before driving a 1931 Gardner 148 on new tires?
Before driving a 1931 Gardner 148 on new tires, inspect the wheels, valve hardware, and overall mounting condition to make sure the tires match the correct 18-inch or 19-inch application. It is also wise to check that the tires are evenly seated and that there is no interference at the fenders, suspension, or steering components.
A first road-use inspection should also include inflation pressure, visible air loss, and a short recheck after initial driving. On a collector car of this age, roadworthiness depends on more than the tire itself, so wheel condition, brake function, and general chassis soundness should be reviewed before putting the Gardner into regular service.
How should 550-18 or 550-19 tires on a collector 1931 Gardner 148 be maintained?
550-18 and 550-19 tires on a collector 1931 Gardner 148 should be maintained with regular pressure checks, visual inspections, and careful storage habits. Bias-ply tires on low-use vehicles deserve close attention for cracking, cuts, bulges, uneven wear, and slow air loss, even when the tread still looks serviceable.
Storage conditions matter just as much as mileage on a car from this era. Keeping the Gardner away from prolonged sun, heat, moisture, and ozone sources helps preserve the tires, while periodic inspection of wheel condition and fitment helps catch issues early before a longer drive or event use puts added demand on the car.
