1931 Elcar Tire Fitment Guide

1931 Elcar vehicles use six tire sizes across four model series: 30X6.75 and 700-18 for the 130 Series and 140 Series, 29X5.25 and 5.25-19 for the 75A Series, and 29X5.50 and 600-19 for the 96 Series. The 130 and 140 Series use 18-inch rim sizes, while the 75A and 96 Series use 19-inch rim sizes. For the listed supported products, 700-18 fits 3.75- to 4.00-inch-wide rims, and 600-19 is supplied on a 19-inch rim size.

The practical takeaway is that year and make alone are not enough on a 1931 Elcar. You need the exact series before selecting a tire, because Elcar used different size families across the lineup and did not keep one universal fitment for all models. Once the model is confirmed, you can narrow your search to the correct pair of sizes and then decide whether you want a blackwall or whitewall presentation where products are available.

On a 1931 Elcar, 30X6.75 is an antique diameter-by-section size. The first number, 30, refers to the tire's approximate overall diameter in inches, and the second number, 6.75, refers to nominal section width. That differs from later modern tire codes that center on rim diameter and aspect ratio, and it reflects a prewar sizing convention used on larger American cars.

That format matters because a 30X6.75 marking points you toward the larger 130 Series and 140 Series tire family rather than the smaller 19-inch sizes used on the 75A and 96 Series. When restoring a 1931 Elcar, antique-format sizing is often part of the car's visual character as much as its fitment. Confirm the actual wheel diameter and compare the existing tire marking before moving to a replacement.

On a 1931 Elcar, 700-18 is a numeric bias-ply size. The 7.00 designates nominal section width in inches and the 18 designates wheel diameter in inches. It is one of the listed sizes for the 130 Series and 140 Series, and the available products in this size are all bias-ply tires with several sidewall style choices.

Numeric sizing can look more familiar to later collector-car owners, but it is still an early bias-ply format and should be matched to the correct model family. For a 1931 Elcar 130 or 140 Series, 700-18 is the supported listed size with current product availability and a specified 3.75- to 4.00-inch rim width range. That makes it a useful reference point when checking whether the car still carries the proper 18-inch wheels.

1931 Elcar sidewall choices vary by size. In 700-18, Firestone offers Blackwall, Double-Whitewall, and Wide Whitewall versions, giving 130 Series and 140 Series owners the broadest visual range. In 600-19, the listed option is a Lester Wide Whitewall, which serves the 96 Series. The other Elcar sizes shown here do not have listed product-side sidewall alternatives.

For a prewar American car like a 1931 Elcar, sidewall style is part of the car's overall presentation, not just a cosmetic afterthought. A blackwall can suit a more restrained period look, while whitewall treatments create a more formal and upscale appearance often associated with restored classics. If the car is being judged, confirm what is appropriate for your series, body style, and event standard before settling on a sidewall treatment.

The listed brands for 1931 Elcar fitments are Firestone and Lester. Firestone appears in 700-18 for the 130 Series and 140 Series, while Lester appears in 600-19 for the 96 Series. Both are offered in bias-ply construction, which matches the period-correct construction type expected for a 1931 American car.

Brand choice on a prewar car often comes down to which size your Elcar uses first and styling preference second. If your car is a 130 or 140 Series, the Firestone 700-18 range gives you multiple sidewall treatments in one size. If your car is a 96 Series, the listed Lester 600-19 provides a traditional whitewall look. Start with the exact size and series, then narrow the brand choice within that fitment.

For the 1931 Elcar in 700-18, Firestone Balloon and Firestone Classic Bias Ply share the same listed size, bias-ply construction, 18-inch rim diameter, 3.75- to 4.00-inch rim width range, and maximum load rating of 1520 pounds at 36 psi. The main listed differences are series identity, sidewall presentation, and weight. Firestone Balloon appears in Blackwall, Double-Whitewall, and Wide Whitewall versions, while the Firestone Classic Bias Ply entry shown here is Blackwall only.

That means the choice is less about basic fitment and more about the look you want on a 130 or 140 Series Elcar. If the car's visual theme calls for a whitewall, the Balloon line provides those options in this size. If you want a simpler blackwall presentation, either series can fit within the listed wheel range and load capacity. Checking the exact sidewall style before selecting matters more here than any major dimensional difference.

For 1931 Elcar vehicles, the listed rim width specification appears on the 700-18 size used by the 130 Series and 140 Series. That size calls for a 3.75- to 4.00-inch rim width on an 18-inch wheel. The 600-19 size listed for the 96 Series confirms a 19-inch rim diameter, but no rim width range is included with the available product shown here.

Rim width matters because early bias-ply tires are designed to carry their shape on a relatively specific wheel profile. If your 1931 Elcar is a 130 or 140 Series, measure the wheel before selecting a 700-18 replacement rather than assuming every 18-inch prewar wheel is the same. On other Elcar sizes, confirm the wheel against the actual tire marking on the car or consult a marque specialist before making a final choice.

Original 1931 Elcar wheels cannot be treated as universal across all six sizes, because the lineup uses both 18-inch and 19-inch rim diameters. The 130 Series and 140 Series tire sizes mount on 18-inch wheels, while the 75A Series and 96 Series use 19-inch wheels. That diameter split alone means the larger-series wheels and smaller-series wheels are not interchangeable for tire selection purposes.

Within a given series, the original wheel can often remain the starting point, but it still needs to match the tire's rim diameter and, where available, the proper rim width range. On a 130 or 140 Series, the available 700-18 products specify a 3.75- to 4.00-inch wheel width. Treat any wheel swap from another Elcar series with caution, even if the car looks similar, because the tire families were not standardized across the full 1931 range.

A 1931 Elcar should be stored in a cool, dry, dark environment away from direct sunlight, electric motors, furnaces, welders, or other ozone-producing equipment that can age rubber. Keep the tires clean, maintain inflation, and move the car periodically so the same section of the bias-ply casing does not stay loaded in one spot for months at a time. For long static storage, some owners also use stands to reduce weight on the tires.

That approach matters especially on a prewar Elcar because bias-ply tires can develop temporary flat-spotting more readily during long periods of inactivity. A short drive may work some of that out, but avoiding it is better than correcting it later. If the car is stored with whitewalls, keep the sidewalls clean and separate from petroleum-based cleaners or dressings that can stain or accelerate aging.

On a 1931 Elcar, tire life is usually judged more by age and condition than by mileage, because many collector cars are driven sparingly. A good rule is to evaluate tires carefully once they reach the five- to seven-year range and to consider replacement as they approach about ten years, even if tread depth still looks acceptable. The DOT date code on modern reproduction tires helps establish age, while cracking, hardening, or visible distortion can shorten that timeline.

Prewar cars often tempt owners to keep old-looking tires because the vehicle is lightly used, but age-related deterioration does not depend on mileage alone. A 1931 Elcar that only goes to shows still puts stress on the tire casing whenever it is driven or even stored under load. If the car has sat for long periods, inspect each tire closely before deciding that age alone can be ignored.

Tires on a 1931 Elcar should be checked before every drive and again before any longer outing. Look for sidewall cracking, weathering, cuts, bulges, tread separation, uneven wear, and any sign that the tire is losing pressure between drives. The spare should be inspected as well, since a collector-car spare often sits untouched for years and may be older than the road tires.

Regular inspection is especially important on a prewar car because the tire is only one part of a much older rolling system. A tire that looks acceptable at a glance may still have a brittle valve stem, a damaged bead area, or age-related casing issues that show up only under closer inspection. Build tire checks into the same routine as fluid, brake, and steering checks before any meaningful road use.

A 1931 Elcar 130 Series would originally have used bias-ply tires, because that was the standard construction for American passenger cars in 1931. The listed sizes associated with the 130 Series are 30X6.75 and 700-18, both of which reflect period-appropriate prewar sizing conventions. No original equipment tire brand should be assumed from that alone, since automakers and dealers could vary supply and specification details.

For restoration work, that means the most important first step is matching the 130 Series to the correct size family and keeping bias-ply construction in place. If you are preparing the car for serious judging, confirm body-style and market-specific expectations with Elcar historians, marque clubs, or event rulebooks. The right construction, size convention, and sidewall appearance typically matter more in judging than simply choosing a recognizable tire brand name.

Correct tire fitment matters on a 1931 Elcar because prewar show judging often pays attention to size, construction type, and sidewall appearance. A 130 or 140 Series shown on the wrong 19-inch-size family, or a 75A or 96 Series wearing the larger 18-inch fitments, would stand out as incorrect. On a car judged for originality, sidewall treatment can also influence how authentic the finished restoration appears.

That does not mean every event applies the same standards, but it does mean tires are part of the restoration story rather than a neutral consumable. Before preparing a 1931 Elcar for judging, compare your series, wheel diameter, and chosen sidewall style against period photos, marque references, and event guidance. A tire can physically fit a wheel and still look out of character for the class in which the car is shown.

For a 1931 Elcar using 700-18, Firestone Balloon and Firestone Classic Bias Ply share the same basic fitment values shown here: bias-ply construction, 18-inch rim diameter, 3.75- to 4.00-inch rim width range, and a maximum load rating of 1520 pounds at 36 psi. The visible distinction is that Firestone Balloon appears in multiple sidewall styles, including whitewall options, while the Firestone Classic Bias Ply entry shown here is blackwall only.

That difference can matter in restoration work because tire appearance contributes heavily to the finished period impression of a prewar car. If your 1931 Elcar restoration calls for a more formal whitewall presentation, the Balloon line provides that within the same size. If the restoration calls for a plainer blackwall look, the Classic Bias Ply entry may align more naturally. The deciding factor is often authenticity of appearance, not a change in base fitment.

1931 Elcar tires can be suitable for road use when they are the correct size, properly fitted, and in sound condition, but they are all bias-ply fitments in the sizes shown here. No explicit speed ratings are listed for the available 700-18 or 600-19 products, so they should be driven with the expectations appropriate to a prewar collector car rather than treated like modern high-speed radials. On a 1931 automobile, braking, steering, suspension condition, and general vehicle design often become the limiting factors before the tire itself does.

The key is to match road speed to the car's age, condition, and intended use. A well-sorted 1931 Elcar on fresh tires can be enjoyable on secondary roads and moderate-speed travel, but sustained modern freeway conditions deserve more caution than they would in a newer classic. Before any highway use, confirm tire condition, inflation, wheel integrity, and the broader mechanical health of the car instead of judging safety by tread depth alone.

Inflation pressure on a 1931 Elcar should be tied to the specific tire size and the manufacturer's rating for that product, not borrowed from another Elcar size. In the listed 700-18 fitment, the available Firestone products show a maximum load capacity of 1520 pounds at 36 psi. The 600-19 listing confirms the size and construction but does not include a pressure figure here, so that size should be matched to the guidance supplied with the tire itself and to the vehicle's original recommendations where applicable.

That distinction matters because a pressure that is acceptable in one prewar size may be wrong for another, even within the same make and year. Start with the original vehicle literature if you have it, then compare that guidance with the reproduction tire maker's stated limits for the exact size on the car. Pressure is a tuning point for ride and wear, but it should always stay within the tire's own rated boundaries.

Before a longer drive in a 1931 Elcar, inspect each tire for cracking, cuts, bulges, irregular wear, and signs of age-related separation, then verify inflation and wheel security. Check the valve stems, inspect the spare, and make sure the tire size on the car matches the proper series fitment rather than a mismatched substitute from another Elcar model. Since these are prewar bias-ply applications, visual condition and casing age deserve as much attention as tread depth.

Tire checks should be part of a broader pre-drive routine on a car of this age. Brakes, wheel bearings, steering play, suspension points, and cooling system condition all affect how safely the car can cover distance, especially if the route involves sustained speeds or rough pavement. A 1931 Elcar rewards careful preparation, and tire inspection is one of the easiest ways to catch a problem before it becomes a roadside failure.