Graham 37 Tires

The Graham 37 has two listed tire sizes for 1929: 31X6.20 and 650-19. The 650-19 size uses a 19-inch rim diameter and is offered in several bias-ply product lines. The 31X6.20 size is an antique diameter-by-section format, so its wheel diameter is not stated in the size code itself.

That means a Graham 37 owner should not choose a tire by model year alone. Start by checking the actual wheel on the car, then match the tire size format to that wheel. If your car has 19-inch rims, 650-19 is the straightforward modern catalog reference. If your car is marked for 31X6.20, confirm the corresponding rim specification before moving to a replacement.

On a Graham 37, 31X6.20 is an antique diameter-by-section size. The first number, 31, is the tire's approximate outside diameter in inches, while 6.20 is the nominal section width. Unlike later sizing systems, that first number does not tell you the wheel diameter.

That distinction matters because modern buyers often assume the largest number in the code is the rim size. With a Graham 37, that would lead to the wrong conclusion. The right approach is to read the size marking on the tire or wheel, then confirm the actual rim measurement before selecting a replacement. Since this style belongs to an early bias-ply application, plan on using a tube as part of the fitment.

A 1929 Graham 37 can show 31X6.20 and 650-19 because the model sits in an era when tire sizing conventions overlapped. One designation uses an older outside-diameter-by-section method, while the other uses an early numeric balloon-style size tied directly to a 19-inch rim. Both can appear under the same model year without meaning they are interchangeable.

The practical takeaway is that the specific wheel on your Graham 37 matters more than the calendar year by itself. Check the tire size stamped on an existing casing if it is legible, inspect the wheel, and compare both before choosing. That extra step helps avoid ordering a tire that matches the year but not the wheel actually fitted to the car.

The Graham 37 is clearly associated with a 19-inch rim when fitted with 650-19 tires. The antique-style 31X6.20 size does not reveal its rim diameter in the size code, because that format identifies outside diameter and section width instead of wheel size. For that reason, the rim diameter must be confirmed from the wheel itself when the car carries the 31X6.20 designation.

If your Graham 37 currently wears 650-19 tires or has wheels known to be 19 inches, selection is much more direct. If the car is associated with 31X6.20, verify the wheel before moving further, especially on a restoration where parts may have been changed over time. That one check is often the difference between a straightforward replacement and a fitment problem.

The right tire size for a 1929 Graham 37 is confirmed by the wheel and the size convention already on the car, not by the year alone. The two listed sizes are 31X6.20 and 650-19, and they represent different ways of describing an early-era tire. A car on 19-inch rims using balloon-type sizing points toward 650-19.

Begin with the tire marking if it is still readable, then inspect the wheel diameter directly. If the car is in restoration and the old tires are missing, compare the wheel to original paperwork, restoration records, or a Graham specialist familiar with the model. That process is especially helpful on cars from transitional years, where two size systems can appear under the same model designation.

Graham 37 tires in 650-19 are available in both blackwall and wide whitewall sidewall styles. Blackwall offerings appear from Firestone, Lester, and Excelsior, while wide whitewall versions are also available in the same basic size. All of the listed 650-19 products are bias-ply tires.

For a more restrained late-1920s look, blackwall is usually the conservative choice. Wide whitewall can suit a period presentation where that appearance is desired, but the right look depends on how the specific Graham 37 is being restored or presented. Match the sidewall style to the car's overall finish, wheel treatment, and restoration goal rather than choosing on appearance alone.

The listed Graham 37 tire brands are Firestone, Lester, and Excelsior in the 650-19 size. Firestone appears in both Classic Bias Ply and Balloon series, Lester appears in blackwall and wide whitewall classic bias-ply forms, and Excelsior appears in the Comp H series. That gives a Graham 37 owner several period-style bias-ply choices within one confirmed size.

Brand choice should come after the size and wheel have been confirmed. Once the fitment is settled, the decision usually comes down to the look you want, the tire series you prefer, and whether blackwall or wide whitewall best suits the car. On a collector car such as a Graham 37, visual character and construction style matter nearly as much as the basic dimensions.

The Graham 37 listings for 650-19 include Firestone Classic Bias Ply, Firestone Balloon, Lester Classic Bias Ply, and Excelsior Comp H. Those series names indicate different period-style product families rather than one identical tire sold under several labels. All of them remain bias-ply offerings in the listed Graham 37 application.

For a Graham 37 owner, the main difference is usually presentation and period character within the same general fitment. A Balloon series leans into the late-1920s balloon-tire era, while Classic Bias Ply and Comp H provide other authentic-looking bias-ply approaches. Once the size is verified, compare the series by appearance, sidewall treatment, and the style of restoration you want the car to reflect.

A Graham 37 should be stored in a cool, dry, dark space with the tires kept away from direct sunlight, electric motors, ozone sources, and wide temperature swings. Tires on low-use collector cars age as much from environment and inactivity as from mileage. Proper inflation also matters during storage so the casing is not left under stress or partially collapsed.

If the Graham 37 will sit for long periods, move it occasionally to avoid flat spotting and keep weight from resting on one patch of the tire for months at a time. Clean, dry floors are preferable, and long-term storage on damp ground should be avoided. Many collectors also reduce strain by using tire cradles or by lightly supporting the car when it will be parked for an extended season.

Tires on a Graham 37 should be inspected before every drive and more carefully several times during the year, even if the car is rarely used. On an early collector car with bias-ply construction, small issues such as cracking, sidewall stiffness, tube problems, or bead-area deterioration can become serious quickly. Low annual mileage does not eliminate the need for routine inspection.

A careful check should include inflation, visible cracking, irregular wear, valve condition, and any sign that the tire has shifted on the rim. Because a Graham 37 belongs to an early motoring era, specialist inspection is wise if the car has been inactive for a long time or if the age of the tires is uncertain. Regular inspection is one of the simplest ways to avoid damaging rare wheels, tubes, and bodywork.

Tires on a Graham 37 should be replaced when age, cracking, hardening, deformation, or structural deterioration appears, even if tread depth still looks usable. Collector tires often age out long before they wear out. On an early bias-ply application, visible condition alone is not the whole story because internal materials can deteriorate over time.

That matters especially on a lightly driven car that spends much of its life in storage or display. If a Graham 37 has old tires of uncertain age, have them evaluated before road use and replace them if there is any doubt about serviceability. A tire that still looks presentable in the garage may no longer be suitable for even modest road miles once age and structure are taken into account.

The Graham 37 is associated here with two period-correct size references for 1929: 31X6.20 and 650-19. The available product families for 650-19 include classic bias-ply and balloon-type series, which reflects the late-1920s transition in tire practice. No single original-equipment brand can be assigned from these listings alone.

For restoration accuracy, the first step is to determine which of the listed size systems belongs on your specific Graham 37. After that, compare period photos, surviving factory literature, and marque-club guidance to decide whether a balloon-style presentation or another bias-ply series best matches the car. That approach keeps the restoration tied to the car's actual configuration rather than to a generic model-year assumption.

Correct tire fitment can materially affect how a Graham 37 is viewed in restoration judging and in the collector market. Size, sidewall treatment, and overall period appearance all contribute to whether the car looks properly finished for its era. A visibly incorrect tire can distract from an otherwise strong restoration because tires are such a dominant visual element.

On a Graham 37, the issue is not only appearance but also whether the chosen tire matches the wheel and late-1920s fitment style the car should carry. Owners pursuing show accuracy should compare the tire size, construction style, and sidewall look against period references and Graham marque expertise. Even drivers who are less concerned with judging usually benefit from getting the fitment right because it supports both authenticity and function.

Graham 37 tires in the listed 650-19 size are available in blackwall and wide whitewall forms. Either sidewall style can contribute to a period-appropriate look depending on the exact restoration goal, but they present the car very differently. Blackwall gives a more restrained appearance, while wide whitewall adds stronger visual contrast.

The right choice depends on how your Graham 37 is being restored, the trim level and presentation you are aiming for, and the period image you want the car to carry. Owners seeking a conservative restoration often lean toward blackwall, while a more formal or dressier visual treatment may support wide whitewall. Match the sidewall to the overall restoration theme so the tires look integrated rather than visually separate from the car.

A properly fitted, correctly inflated, sound-condition bias-ply tire can be appropriate for public-road use on a Graham 37 within the limits of an early collector automobile. Safety depends on more than the tire alone, because wheel condition, tube condition, brakes, steering, suspension, and the overall mechanical state of the car all matter. A tire that is the right size but mounted on an unfit wheel is not a safe setup.

Road use in a Graham 37 should be approached with the expectations suitable to a late-1920s vehicle rather than a modern car. Before regular driving, confirm the wheel diameter, inspect the complete running gear, and make sure the tire construction matches the intended use. Thoughtful preparation is especially important on a car using early bias-ply fitments and period-style wheels.

Before driving a Graham 37, check tire inflation, visible sidewall condition, tread condition, valve stems, and whether the tires appear properly seated on the rims. Also inspect the wheels, lug security, steering response, brake operation, and any signs of tube or rim-strip trouble common to older wheel systems. With a collector car of this age, a brief walk-around can prevent a much larger problem once underway.

It is also wise to confirm that the tire size on the car matches the wheel actually fitted to the Graham 37. That is especially important when the car may have changed hands, been restored years ago, or carries mixed-era parts. Early detection of a mismatch or age-related issue is far easier in the garage than on the roadside.

A Graham 37 should be driven at speeds appropriate to a late-1920s collector automobile running on period-style bias-ply tires, not at the pace expected of a modern vehicle. Even when the tires are new, the entire car remains an early design with older steering, braking, and suspension characteristics. Practical road speed should always reflect the condition of the car, the road surface, and the confidence of the driver.

Owners generally do best when they treat a Graham 37 as a touring or event car rather than a high-speed road machine. Smooth inputs, moderate speed, generous stopping distance, and regular mechanical checks all matter more than outright pace. If the tires are older, the wheels are original, or the car has not been driven much, a cautious approach is the right one until the full setup has been professionally reviewed.