1949 Nash Tire Fitment Guide

1949 Nash vehicles use two tire sizes: 710-15 for the Ambassador 60 and 640-15 for the Ambassador 600. Both are bias-ply sizes for 15-inch wheels, but they are not interchangeable across the full model range as a general rule. The 710-15 tires are suited to rims in the 5.00 to 5.50 inch range, while 640-15 tires appear on narrower wheel ranges, with products covering 4.00 to 4.50 inches and 4.50 to 5.00 inches depending on the tire.

That means the first step on a 1949 Nash is identifying the model, then confirming the actual wheel width on the car before settling on a product. Even though both sizes share a 15-inch rim diameter, the section width and approved rim-width range differ enough that choosing by year alone can send you in the wrong direction.

On a 1949 Nash, 710-15 is a numeric bias-ply tire size. The 710 portion is the nominal section-width designation used in period American sizing, and the 15 identifies the wheel diameter in inches. In the 1949 Nash range, that size applies to the Ambassador 60 and fits 15-inch rims in the 5.00 to 5.50 inch range.

Numeric bias-ply sizing reads differently from later radial markings, so it helps to think of 710-15 as an era-specific size code rather than a direct modern metric conversion. If your Nash still wears older tires or mixed wheels, matching the original numeric size and checking the wheel width will keep the fitment research moving in the right direction.

No, 1949 Nash models do not all use the same tire size. The Ambassador 60 uses 710-15, while the Ambassador 600 uses 640-15. Both are 15-inch bias-ply tires, but the sizes were assigned to different models within the Nash lineup rather than shared across the entire make.

That difference matters because a buyer comparing sidewall styles or brands still has to start with the correct model-specific size. On a 1949 Nash, trim appearance may attract attention first, but tire selection begins with whether the car is the larger Ambassador 60 or the smaller Ambassador 600.

1949 Nash tires are available in several period-appropriate sidewall treatments depending on size. The 710-15 used on the Ambassador 60 comes in blackwall and wide whitewall form. The 640-15 used on the Ambassador 600 is offered in wide whitewall and narrow whitewall versions. All of the available options remain bias-ply, so the visual choice is mainly about appearance rather than switching to a different construction type.

For a postwar Nash, sidewall style changes the car's character more than many buyers expect. Blackwalls typically give a plainer, more utilitarian presentation, while wide whitewalls suit the more formal late-1940s American look. If show authenticity matters, compare the sidewall treatment on your car against period photography, factory literature, or a Nash marque specialist before making the final call.

BFGoodrich and Firestone both offer tires for 1949 Nash vehicles in the original-style bias-ply sizes used across the model range. The 710-15 size for the Ambassador 60 is available from both brands, and the 640-15 size for the Ambassador 600 is as well. Across those sizes, the available choices include blackwall, narrow whitewall, and wide whitewall presentations depending on the exact tire.

That gives a 1949 Nash owner room to choose between two long-established American names while staying within the correct period-style construction. Once the right size is confirmed, the next comparison usually comes down to the sidewall look you want and the wheel-width range of the specific tire rather than a dramatic difference in intended use.

For 1949 Nash vehicles using 640-15 tires, BFGoodrich and Firestone differ in sidewall treatment and approved rim-width range. BFGoodrich offers a wide whitewall 640-15 with a 1190-pound load rating at 32 psi and a 4.00 to 4.50 inch rim-width range. Firestone offers wide whitewall and narrow whitewall versions in 640-15, generally fitting 4.50 to 5.00 inch rims, with most listed at 1190 pounds at 32 psi and one narrow whitewall version listed at 970 pounds at 32 psi.

That means the choice is not just brand preference on a 1949 Nash Ambassador 600. Wheel width and desired sidewall appearance should be checked together, especially if the car has had wheels changed over time. A buyer comparing these 640-15 options should confirm the actual rim before deciding between the narrower-range BFGoodrich fitment and the Firestone options intended for slightly wider rims.

1949 Nash tires use 15-inch rims, but the recommended rim width depends on the size. The 710-15 size used on the Ambassador 60 fits rims from 5.00 to 5.50 inches wide. The 640-15 size used on the Ambassador 600 appears in products covering 4.00 to 4.50 inches and 4.50 to 5.00 inches, depending on the brand and sidewall version chosen.

That is why wheel width should be checked before selecting a specific tire, even when the size code itself is already known. A 1949 Nash with replacement wheels or long-ago restoration work may still have the correct 15-inch diameter but a width that suits one product better than another within the same nominal size.

Both tire sizes used on 1949 Nash vehicles mount on 15-inch wheels, so they share the same rim diameter. That does not automatically make the wheels interchangeable between sizes, because 710-15 and 640-15 are intended for different wheel-width ranges and were assigned to different Nash models. The Ambassador 60 and Ambassador 600 should each stay with the size matched to their model unless a knowledgeable specialist has confirmed a specific alternate wheel setup.

For practical purposes, the shared 15-inch diameter is only the starting point. The safer approach is to verify the width stamped on the wheel or measure it directly, then match it to the tire's approved range. That keeps a 1949 Nash closer to the way it was intended to sit, steer, and carry its load.

A 1949 Nash should be stored in a cool, dry, dark place away from direct sunlight, electric motors, furnaces, battery chargers, and other ozone-producing sources that can accelerate sidewall aging. Because these Nash applications are bias-ply, long stationary periods can also encourage temporary flat-spotting and stiffness on the first miles after the car is moved. Clean, dry floors and stable inflation pressures help reduce stress while the car sits.

If the car will remain parked for extended stretches, roll it periodically or place it on properly positioned stands if that suits your storage plan and suspension considerations. Tire covers can help in bright garages, and a simple walk-around every few weeks will catch pressure loss or early cracking before your next outing.

Tires on a 1949 Nash should be judged more by age and condition than by mileage, since collector cars often travel only limited distances each year. A good rule is to begin close evaluation once tires reach roughly five to seven years of age, and to treat around ten years as a point when replacement deserves serious consideration regardless of remaining tread. The DOT date code on the tire helps establish the tire's actual age.

That timeline matters because a postwar Nash can spend much of its life indoors and still develop age-related hardening, cracking, or structural decline. A tire that looks presentable at a glance may still be too old for regular road use, so age, storage history, and condition should all be weighed together before longer drives.

Tires on a 1949 Nash should be checked before every drive, with a more thorough inspection before tours, club events, or any longer highway outing. Look for sidewall cracking, irregular wear, cuts, bulges, punctures, and signs of slow pressure loss. On a collector car that may sit for stretches, a quick inspection matters just as much after storage as it does after regular use.

A habit of frequent inspection helps catch small issues before they become roadside problems on an older vehicle. It is also wise to inspect the spare, confirm the valve stems are in good condition, and make sure the car is sitting level rather than showing one soft corner that points to a pressure problem.

The 1949 Nash Ambassador 60 used a 710-15 bias-ply tire, which is consistent with mainstream American practice in the late 1940s. Bias-ply construction was the normal original-equipment type in that period, and the available replacements stay within that original-style construction. Specific sidewall treatment could vary by market presentation and owner preference, but the size and bias-ply format are the key authenticity points to preserve.

For restoration work, that means starting with the correct 710-15 size before deciding whether the visual finish should be blackwall or wide whitewall. If your car is being prepared for a judged event, period sales literature, surviving original cars, and Nash club expertise are the best ways to confirm what is most appropriate for your exact presentation.

Correct tire fitment matters on a 1949 Nash because judges and knowledgeable enthusiasts often notice size, construction type, and sidewall style very quickly. A 710-15 bias-ply on an Ambassador 60 and a 640-15 bias-ply on an Ambassador 600 keep the car aligned with period-correct fitment expectations. A visibly different size or a sidewall treatment that clashes with the car's restoration theme can stand out even if the tire physically fits the wheel.

For many show cars, tire choice is part of the overall visual story rather than an isolated maintenance item. Matching the right size to the right model and choosing a sidewall appearance that suits the car's intended era presentation will usually matter more than minor brand differences. Event-specific standards can still vary, so local judging rules and marque guidance are worth checking in advance.

For 1949 Nash vehicles using 710-15 tires, BFGoodrich and Firestone share the same basic fitment figures of a 15-inch rim diameter, 5.00 to 5.50 inch rim-width range, and a 1550-pound load rating at 32 psi. The practical differences in the available choices are appearance and series selection. BFGoodrich offers blackwall and wide whitewall versions in its Silvertown Classic Bias Ply line, while Firestone offers a blackwall version in its Firestone Classic Bias Ply line.

A restoration choice between those 710-15 tires often comes down to how formal or understated you want the Ambassador 60 to look. If the car is being shown, sidewall presentation may influence authenticity as much as brand preference. If the goal is a roadworthy period appearance, both brands keep the size and construction aligned with what a late-1940s Nash should wear.

The available tires for 1949 Nash vehicles are bias-ply designs, and no explicit speed ratings are shown with these sizes. A properly maintained, correctly fitted bias-ply tire can be suitable for normal road use within the practical limits of the vehicle, but a late-1940s Nash should always be driven with respect for its age, suspension design, braking capability, and overall mechanical condition. Highway safety depends on the whole car, not the tire alone.

That makes pre-drive condition more important than chasing modern driving expectations. Fresh, properly inflated tires in the correct size are a strong starting point, but steering response and braking feel on a 1949 Nash will still reflect postwar engineering. For longer highway stretches, conservative speeds and extra following distance are simply part of driving an older American car well.

Several 1949 Nash tire options list their rated load capacity at 32 psi. The 710-15 tires shown for the Ambassador 60 carry 1550 pounds at 32 psi, while many 640-15 tires for the Ambassador 600 carry 1190 pounds at 32 psi and one 640-15 narrow whitewall version is listed at 970 pounds at 32 psi. Those figures describe the tire's rated capacity point and should not be treated as a blanket factory inflation setting for every Nash application.

The right next step is to compare the tire's rated information with the factory recommendation for your specific 1949 Nash model and its intended use. Inflation should be set with the actual tire size, vehicle weight distribution, and driving plan in mind rather than copied from a different size or sidewall style in the same year.

Before a longer drive in a 1949 Nash, inspect each tire for weather checking, cuts, bulges, irregular tread wear, and signs of low pressure. Confirm that all four tires match the car's correct model-specific size, and make sure the spare is usable as well. On a postwar car, the tire check should sit alongside a broader review of brakes, steering, wheel bearings, lights, fluids, and cooling system condition.

A longer outing puts sustained heat and speed into every part of the car, so small tire issues become more important than they might seem around town. It is wise to recheck pressures before departure, look closely at the valve stems, and make sure the car tracks and brakes normally on a short local test drive before committing to the trip.