Graham Standard Tires

Graham Standard uses 29X5.25, 5.25-19, 30X6.00, 6.00-18, 550-18, 650-16, and 6.25-16 across the years covered here. The 1930 year includes 29X5.25, 5.25-19, 30X6.00, and 6.00-18; 1931 uses 550-18 and 6.00-18; 1935 uses 650-16; and 1938 uses 6.25-16. Where product coverage exists, 550-18 uses an 18-inch rim and 650-16 uses a 16-inch rim, while the 5.25-19 and 6.00-18 style codes identify 19-inch and 18-inch rims directly.

The practical step is to match both the year and the wheel diameter on the actual car, because Graham Standard does not stay with one tire size or one rim size through the full span shown here. If the car is a 1930 example, take extra care, since four sizes are listed and they do not all point to the same wheel.

On a Graham Standard, 29X5.25 is an older diameter-by-section size marking. The 29 refers to the tire's overall outside diameter in inches, and the 5.25 refers to nominal section width. It does not tell you the wheel diameter directly, which is why this style can confuse modern buyers who are used to later numeric or metric sizing.

That means you should not assume a 29-inch wheel or try to decode the rim from the first number. Instead, use the year and the actual wheel on the car to identify the correct rim diameter before comparing tire choices, especially on 1930 Graham Standard applications where multiple size conventions appear together.

A 1930 Graham Standard shows four listed sizes because that model year spans more than one fitment pattern. The sizes include both antique diameter-by-section markings and later numeric markings, and they also point to different wheel diameters, including 18-inch and 19-inch applications. That kind of split is typical of early pre-war fitment changes and configuration differences within a single model year.

The key takeaway is that year alone is not enough for a 1930 Graham Standard. Check the wheel diameter stamped or measured on the car, compare the existing tire size if it appears original to the wheel, and then use the year listing as a guide to narrow the correct match.

Graham Standard uses more than one rim diameter across the years covered here. The listed sizes show 19-inch and 18-inch applications in the early years, while later fitments move to 16-inch wheels by 1935 and remain at 16 inches in the 1938 listing. On antique-style sizes such as 29X5.25 and 30X6.00, the rim diameter is not carried in the first number, so the wheel itself must be checked.

That makes wheel diameter the first fitment decision on a Graham Standard. Once you know whether the car has 19-inch, 18-inch, or 16-inch rims, the remaining size choices become much easier to sort by year and configuration.

A 1931 Graham Standard has two listed sizes: 550-18 and 6.00-18. Both are 18-inch applications, but they are not the same section width, so the correct choice depends on the wheel and the configuration the car actually carries. The available 550-18 products are all bias-ply tires built for 18-inch rims, which gives a clear reference point if your car is already fitted with that size.

Start by reading the size on the existing tire if it is believed to match the wheel correctly, then verify the wheel diameter and compare the wheel width where possible. For a pre-war Graham Standard, original literature, restoration records, or a marque specialist can help settle whether the car should be on 550-18 or 6.00-18.

Graham Standard tire options in the covered product sizes include blackwall, wide whitewall, and double-whitewall styles. The 550-18 offerings include blackwall, wide whitewall, and double-whitewall choices, while 650-16 includes blackwall and wide whitewall options across several brands and series. That gives buyers room to choose between a more understated service look and a more decorative period look.

For a restoration-minded Graham Standard, sidewall style should match the era and presentation of the car rather than being chosen casually. A touring or driver-style car may suit blackwalls well, while a more formal pre-war presentation often points buyers toward whitewall treatments that fit the character of the period.

The covered Graham Standard tire offerings come from Excelsior, Firestone, BFGoodrich, Michelin, Coker Classic, Garfield, Lester, Goodyear, STA, and Tornel. Not every brand appears in every size, but 550-18 and 650-16 both have multiple brand choices. Several of those options are traditional passenger-car bias-ply designs, while some 650-16 choices extend into truck and military-style tread families.

Brand selection on a Graham Standard usually comes down to the look you want, the sidewall style you prefer, and whether the car is being restored as a passenger car or adapted to a more utility-oriented use. Once the size is settled, compare the tread family and sidewall treatment instead of picking by name alone.

Graham Standard products span several series families, including Comp H, Firestone Classic Bias Ply, Silvertown Classic Bias Ply, Double Rivet, Coker Classic Bias Ply, Garfield Classic Bias Ply, Deluxe All-Weather, Transport, STA Classic Military, Super Traxion, Transport Highway, Tornel Classic Truck, and Firestone Classic Truck. Those series differ mainly in tread style, period appearance, and intended use, with some focused on passenger-car presentation and others clearly aimed at truck or military-style service.

For a typical restored Graham Standard passenger car, the more car-oriented classic bias-ply series will usually be the first place to look. The heavier-duty 650-16 truck and military series make sense only if the car has a specialized use, a utility conversion, or an owner preference that justifies a less passenger-focused tread pattern.

A Graham Standard should be stored in a cool, dry, dark space with the tires kept away from direct sunlight, electric motors, ozone sources, and standing moisture. Proper inflation matters even during storage, because underinflation allows the casing to flex and flat-spot while the car sits. On a pre-war car with bias-ply tires, long stationary periods are especially hard on the carcass.

If the Graham Standard will sit for months, move it occasionally or support it in a way that reduces constant load on one contact patch. Clean tires with mild soap and water only, and avoid dressings that can leave residue or accelerate surface deterioration.

Tires on a Graham Standard should be inspected before every outing and more thoroughly at regular intervals through the driving season. Look for cracking, cord exposure, bulges, tread separation, impact damage, and irregular wear, and also inspect the tubes, flaps, and rim condition on bias-ply applications. Because these cars are used infrequently, age-related issues often matter more than tread depth.

A short walk-around inspection before driving can prevent a much larger problem once the car is moving. For a Graham Standard that sees road use, a specialist familiar with pre-war wheels and tires should evaluate the complete wheel-and-tire assembly periodically rather than the tire alone.

A Graham Standard tire should be replaced when age, cracking, casing fatigue, vibration, or structural change begins to outweigh whatever tread remains. Collector cars often preserve tread because they cover few miles, but the internal condition of the tire can decline long before the tread looks worn out. Visible weather checking around the sidewall or bead area is a serious warning sign on pre-war bias-ply tires.

Treat age as a service factor, not just mileage. If a Graham Standard still carries an older tire that looks presentable but has uncertain age or history, have it inspected with the same seriousness you would give the wheel, tube, and braking system before continued road use.

Graham Standard appears with multiple size families across the years covered here, including early 1930 sizes, 1931 18-inch fitments, and later 16-inch applications by 1935 and 1938. The available products for covered sizes are modern reproductions of period-style bias-ply tires offered in several classic series rather than one single original-equipment specification across the whole model span. That means there is no single answer for every Graham Standard.

For an accurate restoration, tie the tire choice to the exact year, wheel diameter, and presentation of the car. Factory literature, period photographs, and marque-club knowledge are the best references when deciding whether your Graham Standard should wear blackwalls, whitewalls, or a particular tread family.

Correct tire fitment can matter meaningfully on a Graham Standard because judges and knowledgeable buyers notice size, stance, tread character, and sidewall style quickly. A car wearing the wrong rim diameter, an obviously mismatched section width, or an out-of-period sidewall treatment can lose historical credibility even if the rest of the restoration is strong. Tires influence the whole visual posture of a pre-war car.

If the goal is formal show judging or top-tier restoration quality, match the Graham Standard tire to the exact year and appearance standard you are pursuing. Marque clubs, period sales material, and established restorers are usually the final authority when the car falls into a split-fitment year like 1930.

Graham Standard tire options in the covered sizes include blackwall, wide whitewall, and double-whitewall styles, depending on size. Any of those can look appropriate on a pre-war car when matched to the right year, trim presentation, and restoration goal, but they do not all communicate the same character. Blackwalls tend to give a plainer service look, while whitewall treatments create a more dressed and formal period appearance.

The best choice for a Graham Standard restoration is the one that matches the way the specific car would have been presented, not simply the most decorative option available. Use period photos and marque references to decide whether a restrained blackwall or a broader whitewall better suits your car.

A properly selected and properly maintained tire can make a Graham Standard roadworthy for careful use, but the tire is only one part of the equation. Wheel condition, tube condition, braking ability, steering play, suspension health, and alignment all matter just as much on a pre-war car. Bias-ply tires also deliver a different feel from modern radials, with more tramlining and a narrower comfort margin when pressures or condition are wrong.

Think of road use in a Graham Standard as a full-vehicle readiness question rather than a tire-only question. Before regular driving, have the entire running gear evaluated and make sure the tire size, wheel diameter, and inflation practice all match the car's actual configuration.

Before driving a Graham Standard, check tire pressure, visible sidewall condition, tread condition, wheel fasteners, valve stems, and any signs of tube-related leakage or bead movement. Also inspect for cracking, flat spotting from storage, and uneven wear that might point to alignment or suspension issues. On a car using older-style bias-ply tires, even a short drive deserves a careful pre-drive inspection.

A good routine is to make the tire inspection part of the same checklist as fluids, brakes, steering, and lights. That habit matters even more on a Graham Standard that is used occasionally, because long dormant periods can create problems that do not show up until the car is moving.

A Graham Standard should be driven at conservative speeds that respect both the age of the vehicle design and the behavior of period-style bias-ply tires. Even with fresh reproduction tires, the chassis, steering, and braking expectations of a pre-war car are different from those of a modern vehicle, and the safest pace is one that leaves a wide mechanical and stopping margin. High sustained speeds are not in keeping with the car's original operating character.

The practical approach is to drive a Graham Standard at a measured touring pace and increase speed only if the car proves stable, properly sorted, and comfortable there. If the car has any vibration, wandering, pull, or heat buildup at speed, back down immediately and inspect the tire and chassis setup.