Elcar 120 Series Tires

Elcar 120 Series uses two tire sizes in the 1929 model year: 30X5.77 and 650-20. The 30X5.77 size is an antique diameter-by-section size, while 650-20 is a numeric bias-ply size that fits a 20-inch rim. The available product range on this page is built around 650-20, with all listed products using bias-ply construction.

The practical step is to verify which of those two fitments your particular 1929 Elcar 120 Series carries before making a selection. A car that was built or restored around 650-20 needs a 20-inch wheel, while 30X5.77 should not be interpreted by the first number as wheel diameter. Treat the year as a starting point, then confirm the actual wheel and current fitment on the car.

On an Elcar 120 Series, 30X5.77 is an antique diameter-by-section size. The 30 refers to the tire's approximate outside diameter in inches, and the 5.77 refers to its nominal section width. That first number is not the wheel size, which is the point that causes the most confusion for modern buyers working with pre-war tire markings.

The key implication is that you cannot match 30X5.77 to a wheel by reading the size code alone. The wheel diameter has to be verified separately from the wheel itself or from the correct tire specification for that exact configuration. If your Elcar 120 Series is currently wearing 650-20 tires, do not assume 30X5.77 is interchangeable without confirming the wheel and original setup.

A 1929 Elcar 120 Series can show both 30X5.77 and 650-20 because the model year spans two different sizing conventions. One is an older outside-diameter style and the other is a numeric size that includes the rim diameter directly in the code. That split usually points to a configuration difference within the same year rather than one universal size for every car.

The safest way to sort that out is to identify the wheel actually on the car and compare it with the size currently fitted or with original factory or club literature. This matters especially on a restored or long-stored car, where wheels and tires may have been changed decades ago. Year alone is not enough when the same Elcar 120 Series year carries two different size systems.

Elcar 120 Series tires in the sizes covered here should be treated as tube-type applications. The listed 650-20 products are all bias-ply tires, and antique-format and pre-war bias-ply fitments of this kind ordinarily require tubes. That matches the construction style and era of the Elcar 120 Series.

When fitting new tires, tube condition matters just as much as the casing itself on a collector car of this age. Use the correct tube and flap arrangement where required, and make sure the wheel condition is suitable before mounting. If the car is driven only occasionally, proper tube fitment still matters because long static periods can hide air loss or deterioration until the car is put back into service.

Start with the two sizes associated with 1929 Elcar 120 Series: 30X5.77 and 650-20. Then inspect the wheels and the tires currently on the car, because 650-20 clearly indicates a 20-inch rim while 30X5.77 does not reveal wheel diameter in the size marking. That difference is the fastest way to separate the two fitments.

If the car is a restored example, compare what is on it now with period literature, restoration records, or guidance from Elcar and orphan-car specialists. Many collector cars have had wheels or tires changed over the years, so current fitment should not be accepted automatically without checking. Confirming the wheel first will usually narrow the correct tire choice quickly.

The listed 650-20 Elcar 120 Series products are available in both blackwall and wide whitewall sidewall styles. Firestone appears in both blackwall and a 3.75-inch whitewall, while the truck-oriented Denman and Deka options shown here are blackwall. All of these listed options are bias-ply tires on 20-inch rims.

For a restoration-minded owner, sidewall style should follow the character and intended presentation of the car rather than appearance alone. A blackwall usually suits a more restrained or utility-focused look, while a wide whitewall creates a more formal period presentation. Sidewall choice does not override the need to match the correct size and wheel first.

The brands listed for Elcar 120 Series in 650-20 are Firestone, Denman, and Deka. Firestone appears in passenger-style classic bias-ply and truck-tread offerings, while Denman and Deka appear in truck-oriented bias-ply lines. All listed products for this model group use bias-ply construction.

Brand choice should come after the fitment is settled, not before. Once size, wheel diameter, and intended use are confirmed, the brand and tread family can be matched to the kind of driving or display the car will see. That is especially important on a pre-war car where visual correctness and road manners are both part of the decision.

Elcar 120 Series products in 650-20 include Firestone Classic Bias Ply, Highway Classic Truck, Deka Classic Truck, and Firestone Classic Truck series. The Firestone Classic Bias Ply options are passenger-oriented bias-ply tires, while the truck-labeled series suggest a heavier-duty tread family within the same basic 20-inch numeric size range. All remain period-style bias-ply constructions rather than radial alternatives.

That means the decision is not only about size, but also about the character of the tire you want on the car. A passenger-style classic bias-ply generally suits a restored passenger car presentation, while truck-series patterns may appeal where load style or tread appearance is part of the goal. Match the tire series to the vehicle's intended use and visual standard after confirming the fitment.

A stored Elcar 120 Series should be kept in a cool, dry, dark environment with the tires away from direct sunlight, ozone sources, and large temperature swings. Bias-ply collector tires can flat-spot or stress their casings if the car remains motionless in one place for long periods. Clean, dry storage is especially important on a pre-war car that may spend much of its life in seasonal use.

If the car will sit for extended periods, move it occasionally or support it in a way that reduces continuous load on one section of the tire. Keep inflation appropriate for storage and inspect the wheel and valve area for slow air loss. Good storage habits do not just preserve tread; they also help protect sidewalls, tubes, and the overall ride quality of the Elcar 120 Series.

Tires on an Elcar 120 Series should be inspected before every drive and more thoroughly at regular intervals during the season. On a pre-war bias-ply application, that means checking inflation, sidewall condition, tread surface, valve stems, and any signs of tube or wheel issues. A collector car that is driven infrequently can still develop age-related problems while parked.

A hands-on inspection matters because a tire can look acceptable from a distance and still have cracking, bead issues, or air retention problems that become serious once the car is moving. Include the spare in the inspection routine if one is carried. Periodic professional inspection is wise for any Elcar 120 Series that is used beyond short display movements.

Elcar 120 Series tires should be replaced when age, cracking, hardening, casing distortion, repeated air loss, or other structural concerns appear, even if the tread still looks deep. Collector tires often age out long before they wear out, and that is particularly true on lightly used pre-war cars. Tread depth alone is not a reliable measure of serviceability on a car of this era.

Any tire that has spent decades mounted, stored improperly, or exposed to heat and ozone deserves careful evaluation before road use. Replacement timing should be guided by condition, age, and how the car is used rather than mileage. When the car is meant for touring rather than static display, erring on the side of fresh, correctly fitted tires is usually the prudent choice.

Elcar 120 Series is associated here with two 1929 tire sizes: 30X5.77 and 650-20. That tells you the model year spans more than one acceptable fitment pattern, including both an antique diameter-by-section size and a numeric size on a 20-inch rim. The available products shown for the numeric size are all bias-ply, which is appropriate to the period.

For an authenticity-focused restoration, the right question is not just which size belongs to the model, but which size belongs to your exact car and wheel setup. Factory literature, surviving original wheels, and marque specialists are the best references when sorting that out. Restoration correctness on an Elcar 120 Series often depends on those small year-and-configuration details.

Correct tire fitment can affect both judging results and how an Elcar 120 Series is perceived by knowledgeable collectors. Size, sidewall style, construction type, and overall period appearance all contribute to whether the car looks right for its era. On an uncommon pre-war make, those details stand out even more because buyers and judges tend to look closely at visible restoration choices.

A car fitted with a size or sidewall style that conflicts with its wheels or historical presentation can look subtly wrong even if it is mechanically usable. Matching the tire to the specific wheel and restoration goal helps preserve authenticity as well as stance. When concours standards matter, compare the car against period references and club guidance before finalizing the tire choice.

Elcar 120 Series tires in 650-20 are offered here in blackwall and wide whitewall form. Both sidewall approaches can suit late-1920s restoration work depending on the presentation standard and how the particular car was equipped or restored. The available truck-oriented options in this size are blackwall, while Firestone appears in both blackwall and wide whitewall.

Choosing the correct sidewall style should follow the car's restoration objective rather than personal preference alone. A formal, highly presented car may call for a wide whitewall appearance, while a more restrained or utility-minded interpretation often leans blackwall. If the Elcar 120 Series is being judged, period photography and marque-specific references are the best tie-breakers.

A properly selected, correctly mounted, and well-maintained tire can make a Elcar 120 Series suitable for cautious public-road use within the limits of a 1929 automobile. The tires listed here for 650-20 are bias-ply designs, which are appropriate to the period but behave differently from modern radials in steering feel, braking response, and tracking. Safety depends as much on the overall mechanical condition of the car as on the tire itself.

Before regular road use, make sure the wheels, tubes, brakes, steering, and suspension are in sound condition and that the tire size truly matches the car. A pre-war automobile should be driven with more margin, more following distance, and less speed than a modern car. The tire choice needs to support that conservative style of operation.

Before driving a Elcar 120 Series, check inflation, visible sidewall condition, tread surface, valve stems, and whether the tire sits properly on the rim. Also confirm that the car is on the correct size for its wheel, especially if there is any uncertainty between 30X5.77 and 650-20. On a 1929 car, tire readiness should be part of a larger pre-drive inspection that includes brakes and steering.

That quick inspection helps catch the problems most likely to spoil a short drive: underinflation, age cracking, tube leaks, and mismatched fitment. If the car has been sitting for weeks or months, pay extra attention because collector tires can deteriorate in storage without showing dramatic wear. A few minutes of checking before movement is far easier than dealing with a roadside failure.

Appropriate speed for a Elcar 120 Series on period-style bias-ply tires should be conservative and in keeping with the capabilities of a late-1920s automobile. Even when the tires are new, the steering, brakes, road surfaces, and chassis design of the car belong to a very different motoring era than modern traffic. Safe operation is about preserving a margin rather than testing the limits of the tire.

Owners generally do best with moderate touring speeds and a careful eye on road conditions, heat buildup, and how the car feels. High sustained speeds are not the mission profile for a pre-war collector car, especially one using tube-type bias-ply tires. If the Elcar 120 Series is driven mainly for shows, local tours, or parade use, that conservative pace is exactly where it belongs.