1940 Cadillac Tire Fitment Guide

1940 Cadillac vehicles use two tire sizes: 700-16 and 750-16. The 700-16 size fits the 1940 Cadillac 60 Series and 62 Series, while 750-16 fits the 1940 Cadillac 72 Series, 75 Series, and V16. Both sizes mount on 16-inch wheels, but the recommended rim width range is different where listed: 700-16 products are shown on 4.50- to 5.50-inch rims, while 750-16 products are shown on 5.00- to 6.00-inch rims.

That split matters because a 1940 Cadillac buyer cannot choose by year and make alone. The first step is identifying the exact series, then confirming the wheel diameter and actual rim width on the car before selecting a product. Once the correct size is established, the remaining choice usually comes down to sidewall appearance and product details rather than changing to another overall fitment family.

On a 1940 Cadillac, 700-16 is a numeric bias-ply tire size. The 7.00 portion refers to the nominal section width, and the 16 refers to the wheel diameter in inches. For 1940 Cadillac applications, this size is used on the 60 Series and 62 Series, and it appears in blackwall, wide whitewall, and one commercial-marked 700-16C version depending on the product selected.

Numeric sizes like 700-16 are typical of the era and are very different from later alphanumeric or metric sizing systems. If your Cadillac is a 60 or 62 Series car, this is the size family to research further, but it is still wise to compare the actual wheel width against the tire's approved rim range before final selection, especially on cars that may have had wheels changed decades ago.

No, 1940 Cadillac models do not all use the same tire size. The 60 Series and 62 Series use 700-16, while the 72 Series, 75 Series, and V16 use 750-16. All of those sizes are bias-ply and all mount on 16-inch wheels, but they are assigned by model group rather than shared across the entire Cadillac lineup.

That means model identification is a necessary first step, especially for cars bought mid-restoration or inherited without complete records. Cadillac's 1940 range spans more than one class of automobile, so it is normal for the senior cars to use a different size than the junior lines. If the car's body style or series tag is in question, a Cadillac club or marque specialist can help confirm the series before you settle on a tire size.

A 1940 Cadillac buyer should choose 700-16 or 750-16 according to the model, not personal preference. The 700-16 size belongs to the 60 Series and 62 Series, while 750-16 belongs to the 72 Series, 75 Series, and V16. Both sizes are bias-ply constructions, so this is not a radial-versus-bias decision; it is a matter of matching the correct period size to the correct Cadillac series.

Once the model is confirmed, the practical choice shifts to how you want the car to present visually. Blackwall and wide whitewall options are both available within these fitment groups, and that can make a noticeable difference in the finished look of a prewar Cadillac. If your car is being restored for authenticity, keep the model-specific size fixed and then compare sidewall style against period photos, judging standards, or marque-club guidance.

1940 Cadillac tires are available in both blackwall and wide whitewall styles. In 700-16, blackwall and wide whitewall choices are offered across several brands, and the same two sidewall styles also appear in 750-16. That gives both the junior and senior 1940 Cadillac series a choice between a more restrained appearance and the brighter, more formal look many collectors associate with premium American cars of the period.

Sidewall style does not change which model the tire fits, but it does influence the overall character of the restoration. Wide whitewalls are often favored on fully dressed show cars, while blackwalls can suit a more understated presentation or certain service-oriented looks. The best choice depends on how your Cadillac is being restored, the trim and body style, and the visual standard you want the finished car to meet.

Several brands offer tires for 1940 Cadillac applications. The 700-16 size is available from Lester, Avon, BFGoodrich, and Firestone, while 750-16 is offered by Firestone, Lester, and BFGoodrich. All of the listed fitments for 1940 Cadillac are bias-ply, but the brands differ in sidewall presentation, load markings, and in some cases rim-width guidance within the same basic size.

Brand choice on a prewar Cadillac usually comes down to the look you want and the product details that matter to your build. Some buyers prioritize a traditional wide-whitewall presentation, while others want a blackwall appearance or a specific line with published load information. Comparing brands within the correct size is worthwhile, but the series-specific fitment remains the first filter before brand preference enters the conversation.

1940 Cadillac tire rim width depends on the size used by the model. For 700-16, listed products show an approved rim width range of 4.50 to 5.50 inches. For 750-16, listed products show an approved rim width range of 5.00 to 6.00 inches. Both sizes use 16-inch wheel diameter, but width guidance changes with the tire size.

That distinction matters because two 16-inch wheels are not automatically interchangeable once width is considered. Before fitting tires to a restored or long-stored Cadillac, measure the wheel or confirm its stampings rather than assuming the original wheel is still present. Staying within the approved rim-width range helps preserve the intended tire profile and avoids setup problems that can affect appearance and road manners.

1940 Cadillac tire products in these sizes do not carry TL or TT markings in the listed size descriptions, so tube requirements should be confirmed at the product level and against the wheel itself before installation. Every listed fitment for 1940 Cadillac is a bias-ply design on a prewar 16-inch application, which often leads restorers to pay close attention to wheel condition, valve-stem arrangement, and how the specific tire is intended to be fitted.

The practical step is to verify the exact tire you plan to use and inspect the wheel before mounting, especially on original or older restored wheels. Tube decisions are not something to guess on a collector Cadillac, because the wheel's construction and the product's intended setup both matter. Handling that question before installation avoids rework and makes it easier to match the complete assembly to the car's intended use.

Original 1940 Cadillac wheels can only be shared across both tire sizes if the wheel diameter is 16 inches and the width is appropriate for the tire being fitted. Both 700-16 and 750-16 mount on 16-inch wheels, but 700-16 products are shown with a 4.50- to 5.50-inch rim-width range, while 750-16 products are shown with a 5.00- to 6.00-inch range. That means diameter compatibility alone is not the whole story.

A 60 or 62 Series owner should not assume a wheel from a senior Cadillac will be ideal just because both take 16-inch tires, and the reverse is equally true. Originality, wheel width, and the exact series all need to line up. If your car has had wheels swapped over the years, confirming width before mounting tires is a much safer path than relying on appearance alone.

A 1940 Cadillac should be stored away from direct sunlight, electric motors, welders, heaters, and other ozone-producing equipment, with the tires kept clean and dry. Bias-ply tires tend to be more sensitive to long static periods than modern radials, so they benefit from periodic movement to change the contact patch or from careful support practices during long-term storage. Proper inflation during storage also helps the casing keep its intended shape.

For a collector Cadillac that sits through part of the year, the goal is to limit flat-spotting, sidewall aging, and environmental cracking. Rolling the car occasionally, avoiding damp floors, and keeping the storage area temperate all help preserve the tires. If the car will be parked for an extended season, include the spare in the same routine, since it may become your only fallback on the road.

Tires on a 1940 Cadillac are usually replaced by age and condition rather than tread wear alone. On collector vehicles, a careful evaluation around the five- to seven-year mark is a sensible habit, and many owners treat roughly ten years from the tire's manufacturing date as a point where replacement deserves serious consideration even if the tires still look usable. The DOT date code on the tire is the starting point for that timeline.

A prewar Cadillac often covers limited annual mileage, so a tire can appear sound while still aging internally. That is why visual freshness should not be the only measure. If the car is driven only to shows or on occasional weekend outings, keep a dated maintenance record for the tires and inspect age just as seriously as tread depth when deciding whether to continue using them.

Tires on a 1940 Cadillac should be inspected before every drive and again before any longer outing. Look for sidewall cracking, tread separation, cuts, bulges, uneven wear, and pressure loss, and pay close attention to valve stems and the spare tire as well. On an older luxury car with substantial weight and long periods of occasional use, catching a problem in the garage is far better than discovering it at road speed.

A quick walkaround is usually enough for local drives, but a longer trip deserves a more thorough check with a gauge and a close look at each casing. If your Cadillac uses older wheels or hardware, it also makes sense to inspect wheel condition whenever the tires are off the car. Small issues become bigger problems faster on collector cars that are not driven every day.

A 1940 Cadillac 60 Series would have been fitted in bias-ply form, and the size used for the 60 Series in this fitment group is 700-16. That aligns with what buyers expect from a 1940 American luxury car, since bias-ply construction was standard for the period. Original-equipment brand selection can vary by market and production context, so the most reliable path for a strict restoration is to confirm the car's specific history through Cadillac reference material or marque specialists.

For most restorations, getting the size, construction type, and sidewall look right matters more than chasing a brand assumption. A 60 Series restored for judged authenticity should remain on the 700-16 bias-ply path and then refine the final look with the appropriate blackwall or whitewall presentation. If the car has unusual coachwork or export history, a Cadillac club can help narrow the final cosmetic details.

Correct tire fitment matters a great deal when showing a 1940 Cadillac because judges and knowledgeable enthusiasts notice size, construction type, and sidewall appearance immediately. A 60 or 62 Series on 750-16 tires, or a senior 72, 75, or V16 on 700-16 tires, would stand out as incorrect. On a prewar Cadillac, visible details such as blackwall versus wide whitewall can also influence whether the car looks properly finished for its intended style and level of restoration.

The right approach is to match the model-specific size first and then evaluate sidewall treatment against the car's build theme and the standards of the event you plan to enter. Some shows reward broad historical accuracy, while others expect tighter marque-specific correctness. Event rules and Cadillac club judging guides are useful references when authenticity matters as much as overall condition.

For the 1940 Cadillac in 750-16, BFGoodrich and Firestone offerings differ in sidewall presentation, published load-and-pressure figures, and product weight. The BFGoodrich 4.125-inch whitewall 750-16 is shown at 1850 pounds at 48 psi with a 5.00- to 6.00-inch rim-width range and a 30-pound weight. Firestone appears in both blackwall and 4.50-inch whitewall 750-16 forms, each on a 5.00- to 6.00-inch rim-width range, with a listed 1660 pounds at 40 psi and weights of 29 to 31 pounds depending on version.

Those differences give a 1940 Cadillac owner a meaningful choice without changing the basic fitment. One path may better suit the look of a formal senior car because of sidewall width, while another may appeal for its published specification set or blackwall availability. Comparing those details within the correct 750-16 size is more useful than treating all bias-ply tires in that size as interchangeable.

1940 Cadillac tires can be suitable for highway use when they are in good condition, correctly sized to the model, and run within their design limits. The listed 700-16 range includes an Avon 700-16C 102/100L carrying an L speed rating, which corresponds to 75 mph, while the other listed products do not show speed letters in the size description. All of the fitments here are bias-ply, so they should be approached with the manners and expectations appropriate to prewar tire construction.

On a 1940 Cadillac, the car's brakes, steering, suspension condition, and age-related mechanical health often matter just as much as the tire itself at normal highway speeds. A well-sorted Cadillac can be driven confidently, but it should be driven as a 1940 automobile rather than as a modern car. Keep speed, road crown, and emergency maneuver expectations realistic, especially on long-wheelbase senior models.

Inflation pressure on 1940 Cadillac tires should follow the vehicle's original recommendation as the baseline and the tire manufacturer's published limits for the specific product you choose. Listed product figures vary by size and tire: examples include 700-16 products at 1800 pounds at 36 psi and 1900 pounds at 36 psi, and 750-16 products at 1660 pounds at 40 psi and 1850 pounds at 48 psi. Those figures are product-specific capacity references, not a universal inflation setting for every 1940 Cadillac.

The important point is not to transfer a pressure figure from one size or product to another just because both fit a 1940 Cadillac. Start with the correct size for your series, then match the pressure approach to that exact tire and to the car's intended use. Checking pressures cold before driving is especially important on a collector vehicle that may sit between outings.

Before a longer drive in a 1940 Cadillac, inspect each tire for cracking, exposed cords, bulges, cuts, irregular wear, and signs of pressure loss, and make sure the spare is serviceable as well. Confirm that the car is riding on the correct series-specific size, since 700-16 and 750-16 are not interchangeable across the whole 1940 Cadillac range. A pre-drive check should also include valve stems, wheel hardware condition, and a close look at any tire that has spent long periods parked under load.

Tires are only one part of preparing a prewar Cadillac for distance, but they are one of the easiest places to prevent roadside trouble. Once the tires pass inspection, expand the check to brakes, cooling system, steering play, and basic fluids so the car is ready as a complete package. A careful hour in the garage is often the difference between a relaxed tour and a shortened trip.