The 1931 Graham Custom comes from a period when upscale American cars balanced advancing engineering with distinctive coachwork and a strong road presence. For owners restoring or maintaining one today, tire choice plays a major role in preserving that long, graceful pre-war stance and the driving character that goes with it. This Graham Custom uses a 650-18 bias-ply tire on an 18-inch rim. Available choices center on Firestone Balloon tires, with either a blackwall or a 3.50-inch wide whitewall presentation. The key decision is usually whether to keep a traditional restoration-oriented look or choose the sidewall style that best suits the car's finish and intended use.
Which Tire Size Is Right for The 1931 Graham Custom
The 1931 Graham Custom uses one primary tire size: 650-18. It is a bias-ply fitment for an 18-inch rim, and the covered 8 Cyl. sub-model uses that same size, so the main decision is not which size fits but which Firestone Balloon version best matches the car's appearance, wheel setup, and restoration goals.
A 650-18 size is a vintage numeric bias-ply designation in which the 6.50 figure refers to the tire's nominal section width in inches and the 18 identifies the wheel diameter. For a 1931 Graham Custom, that keeps the car in the traditional bias-ply construction associated with its era and preserves the tall, upright look expected on a pre-war automobile. In this size, Firestone Balloon options include both blackwall and 3.50-inch wide whitewall styles. The right choice usually comes down to the look you want, while still confirming the wheel is an 18-inch rim within the proper width range.
Tire fitment is straightforward for the covered 1931 Graham Custom sub-model. The 8 Cyl. version uses the same 650-18 bias-ply size, so the focus stays on wheel confirmation and selecting the sidewall treatment that suits the vehicle's presentation.
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1931 Graham Custom 8 Cyl.
The 1931 Graham Custom 8 Cyl. uses the 650-18 bias-ply tire size on an 18-inch rim. That keeps tire selection centered on a traditional pre-war fitment, with the main choice being between Firestone Balloon blackwall and wide whitewall appearance.
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 Graham Custom Tires for Sale
Available 650-18 choices center on Firestone Balloon bias-ply tires. The main comparison points are blackwall versus 3.50-inch wide whitewall styling, along with rim-width compatibility, weight, and other traditional fitment details for 18-inch wheels.
Common questions for the 1931 Graham Custom usually center on the 650-18 tire size, 18-inch rim fitment, bias-ply construction, sidewall appearance, and what to inspect before putting a collector-era car back on the road.
Tire Size & Fitment
What tire size fits a 1931 Graham Custom?
The 1931 Graham Custom uses a 650-18 tire size. This is a numeric bias-ply fitment, and the covered 8 Cyl. sub-model uses that same 650-18 size, so there is one primary size to focus on for this vehicle.
That makes the first job confirming that the car still has 18-inch wheels in the proper vintage width range rather than deciding between multiple primary sizes. Once the wheel setup is verified, the real choice becomes selecting the tire's sidewall style and restoration presentation, such as blackwall or wide whitewall.
What size rim does a 1931 Graham Custom use?
The 1931 Graham Custom uses an 18-inch rim with its 650-18 tire size. Available tires in this fitment are built around that 18-inch wheel diameter, and the applicable Firestone Balloon products pair that rim diameter with a wheel-width range of 3.25 to 3.50 inches.
Wheel diameter matters first, but wheel width matters too on a pre-war car. Many older vehicles have had wheels changed over the years, so it is worth measuring the actual rim before mounting new tires, especially if the car has seen restoration work, wheel swaps, or long-term storage.
Does the 1931 Graham Custom 8 Cyl. use the same tire size?
Yes. The covered 1931 Graham Custom 8 Cyl. uses the same 650-18 bias-ply tire size as the main 1931 Graham Custom fitment. There is no separate primary size to sort out for that sub-model within this application.
That keeps the selection process fairly simple. Instead of sorting through multiple fitment combinations, the buyer can focus on wheel condition, proper 18-inch rim dimensions, and the visual style of the tire, especially whether a blackwall or wide whitewall better suits the car's finish and restoration direction.
Choosing the Right Tire
What should I consider when choosing a 650-18 tire for a 1931 Graham Custom?
Start with the basics: the correct 650-18 size, bias-ply construction, and an 18-inch wheel that matches the tire's intended rim-width range. For this Graham Custom, available choices stay within the Firestone Balloon family, so the decision is mostly about appearance and compatibility rather than switching between unrelated tire types.
A blackwall gives a more restrained, functional look, while the 3.50-inch wide whitewall creates a more formal pre-war presentation. It also helps to compare details such as tire weight and load capacity where stated, then confirm the actual wheel dimensions and overall vehicle setup before finalizing the selection.
What sidewall styles are available for 1931 Graham Custom tires?
The available 650-18 tires for a 1931 Graham Custom include both blackwall and wide whitewall sidewall styles. In this fitment, the wide whitewall version is a 3.50-inch whitewall in the Firestone Balloon line, while another Firestone Balloon option is offered as a blackwall.
That choice mainly affects the car's visual character rather than its basic fitment. A wide whitewall often suits a more formal restoration-oriented presentation, while a blackwall can feel more understated. Either way, sidewall style should be chosen after confirming the tire size, construction, and wheel dimensions are correct for the car.
How do I choose between the available 650-18 tires for a 1931 Graham Custom?
The available 650-18 choices for a 1931 Graham Custom are both Firestone Balloon bias-ply tires, so the comparison is fairly focused. The biggest visible difference is sidewall treatment, with one blackwall option and one 3.50-inch wide whitewall option, along with some variation in product weight and stated load detail.
Choose based on the car's intended presentation and use. A show-focused or restoration-minded car may call for the visual impact of a wide whitewall, while a more restrained driver may suit a blackwall. It is also smart to check wheel width, tire condition standards, and any previous wheel changes before making the final call.
Restoration & Appearance
Which tire should I choose for a period-style 1931 Graham Custom?
A 650-18 bias-ply tire is the right starting point for a period-style 1931 Graham Custom because it preserves the vintage sizing format and construction associated with the car's era. In this fitment, the available Firestone Balloon options keep the selection within a traditional pre-war visual and mechanical presentation.
The final choice often comes down to how formal or understated the car should look once finished. A wide whitewall can dramatically change the vehicle's presence, while a blackwall keeps the look simpler. If exact originality matters, compare the finished car against marque references, period photos, or other vehicle-specific historical material.
Does correct tire fitment matter for a 1931 Graham Custom restoration?
Yes, correct tire fitment matters a great deal on a 1931 Graham Custom restoration. The proper 650-18 size and bias-ply construction influence the car's stance, wheel-to-tire proportions, and the overall visual balance that gives a pre-war automobile its authentic road-going presence.
Fitment also affects practicality, because an incorrect wheel diameter or width can create mounting and clearance problems even when the tire looks close at a glance. Restorations often involve wheel refinishing or replacement, so verifying the actual 18-inch rims before mounting new tires is an important step in finishing the car correctly.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1931 Graham Custom?
Yes. Even though the primary fitment is straightforward at 650-18, modifications can still affect whether a tire suits the actual car in front of you. Wheel replacements, altered rim widths, brake conversions, suspension work, or body adjustments can all change how a vintage tire sits and clears.
That is why the wheel should be measured rather than assumed, especially on an older restoration or long-owned collector car. Check the 18-inch rim diameter, confirm the wheel width matches the tire's intended range, and look closely at steering and fender clearance before putting the car back into regular road use.
What should I inspect before driving a 1931 Graham Custom on new tires?
Before driving a 1931 Graham Custom on new tires, inspect the wheels for damage, rust, cracks, or poor bead-seat condition, and make sure the 18-inch rims are the proper width for the 650-18 fitment. It also helps to confirm valve-stem condition and that the tires are mounted and inflated correctly.
A short, careful first drive is a smart follow-up on any collector vehicle. Watch for rubbing during turns, recheck air pressure after the initial run, and pay attention to steering feel, vibration, or uneven vehicle behavior. On a pre-war car, those basic checks matter just as much as choosing the correct tire size.
How should 650-18 tires on a collector 1931 Graham Custom be maintained?
650-18 tires on a collector 1931 Graham Custom should be kept clean, properly inflated, and inspected regularly for cracking, cuts, bulges, air loss, and uneven wear. Because collector cars are often driven infrequently, age and storage conditions can matter as much as tread depth when judging tire condition.
Storage habits make a real difference on a pre-war vehicle. Keeping the car away from prolonged sunlight, heat, moisture, and ozone sources helps protect the sidewalls, and periodic inspection is important even during off-road periods. A brief check before each outing is a good routine for a low-use Graham Custom.
