1951 Plymouth Tire Fitment Guide

1951 Plymouth vehicles use three different tire sizes: 640-15, 670-15, and 710-15. The P22 and Suburban use 640-15, the P23 uses 670-15, and the Wagon appears with either 670-15 or 710-15 depending on application. All three sizes mount on 15-inch wheels. Rim-width ranges vary by tire size and product, with 640-15 generally listed from 4.00 to 5.00 inches, 670-15 from 4.50 to 6.00 inches, and 710-15 from 5.00 to 5.50 inches.

Model identification matters on 1951 Plymouth more than many buyers expect, especially with the Wagon showing up in two sizes. Once you confirm the model, compare your current tire size and wheel width before choosing a replacement. If your car is already restored, the existing wheel and tire combination often points you in the right direction, but it is still wise to verify the size molded on the sidewall and the actual wheel dimensions before settling on a tire.

A 640-15 marking on a 1951 Plymouth tire is a traditional numeric bias-ply size. The 6.40 figure refers to the tire’s nominal section width in inches, while 15 is the wheel diameter in inches. On 1951 Plymouth models, 640-15 is used on the P22 and Suburban. This is an era-correct bias-ply sizing system, so it does not read like later metric radial sizes and it does not include a modern aspect-ratio format.

Seeing 640-15 on your sidewall tells you that fitment starts with a 15-inch wheel and a bias-ply tire profile appropriate to early-1950s American cars. It also helps narrow the model application, since that size does not belong across the entire Plymouth lineup for 1951. Once the size is confirmed, the next decision is usually visual: wide whitewall for a more upscale period appearance or a simpler narrow-whitewall treatment depending on the look you want.

No, all 1951 Plymouth models do not use the same tire size. The P22 and Suburban use 640-15, the P23 uses 670-15, and the Wagon can use either 670-15 or 710-15. Every size is a 15-inch bias-ply fitment, but the section width changes by model. That means the lineup shares a common wheel diameter while still requiring different tire sizes depending on the body style and model family.

That difference is especially important for Wagon owners, because the larger 710-15 fitment is not interchangeable with the rest of the range simply because the rim diameter is the same. A buyer who only knows the car is a 1951 Plymouth is still one step short of an informed tire choice. Confirm the model first, then compare the wheel width and the existing sidewall marking so you can choose the correct size with confidence.

1951 Plymouth tires are available in several period-style sidewall treatments depending on size. The 640-15 range includes wide whitewall and narrow whitewall choices, 670-15 includes blackwall and wide whitewall options, and 710-15 also includes blackwall and wide whitewall versions. Those differences matter visually because sidewall treatment does a lot to define how an early-1950s Plymouth presents, from a plain everyday-driver look to a more dressed-up showroom-style appearance.

Wide whitewalls are typically the look most buyers associate with well-finished early-fifties American restorations, while blackwalls suit more understated driver builds and some utility-oriented presentations. Narrow whitewalls on 640-15 create a middle ground that still feels period-appropriate without the stronger visual statement of a wide white. If appearance is just as important as fitment on your 1951 Plymouth, sidewall style should be chosen with the car’s restoration theme in mind rather than as an afterthought.

Several brands offer tires for 1951 Plymouth vehicles, and the available names depend on size. The 640-15 selection includes BFGoodrich and Firestone. The 670-15 size is the broadest, with Firestone, US Royal, Coker Classic, and Universal Vintage Tire offerings. The 710-15 range includes BFGoodrich and Firestone. Every listed option for this year and make is a bias-ply tire, so brand choice is mainly about series preference, sidewall styling, and the exact size needed for your model.

Buyers often start with a preferred historic American brand, but it makes more sense to narrow the field by fitment first and then by appearance. A P22 or Suburban owner shopping 640-15 has a different brand pool from a P23 owner shopping 670-15, and Wagon owners may have access to either the 670-15 or 710-15 brand mix depending on their application. Once the correct size is established, compare the available sidewall treatments and wheel-width compatibility inside that size.

In 1951 Plymouth 710-15 fitment, both Firestone and BFGoodrich offer bias-ply options on 15-inch rims with a listed rim-width range of 5.00 to 5.50 inches. Both brands list a maximum load capacity of 1550 pounds at 32 psi in this size. The practical differences shown here are sidewall presentation and weight: BFGoodrich appears in both blackwall and wide whitewall versions at roughly 21 to 23 pounds, while Firestone appears in blackwall form at about 24 pounds.

That means a Wagon owner choosing 710-15 is not deciding between radically different fitment requirements so much as between brand character and visual treatment. If the car’s restoration leans toward a dressed-up passenger look, a wide whitewall BFGoodrich may suit the theme. If the goal is a more restrained utility look, a blackwall Firestone or BFGoodrich can make sense. Either way, confirm that your wheel width falls within the listed range before making the final call.

Rim-width requirements for 1951 Plymouth tires depend on the size you are using. For 640-15, listed fitments span 4.00 to 4.50 inches on some products and 4.50 to 5.00 inches on others, giving that size an overall product range of 4.00 to 5.00 inches. For 670-15, listed products cover 4.50 to 5.00 inches and 5.00 to 6.00 inches, so the overall range reaches 4.50 to 6.00 inches. For 710-15, listed products call for 5.00 to 5.50 inches.

Those ranges show why wheel width should be checked before ordering even when the sidewall size is already known. Two tires in the same nominal size can still have different approved wheel-width windows depending on brand and construction details. If your 1951 Plymouth still wears original-style wheels, measure the wheel or verify the stamping before choosing between products, especially in 640-15 and 670-15 where the approved width spread is broader across the available offerings.

All listed 1951 Plymouth tire sizes for this year use a 15-inch rim diameter, so the wheel diameter itself is consistent across 640-15, 670-15, and 710-15. That means original 15-inch Plymouth wheels are in the right diameter family for these tires. The remaining issue is wheel width, because the approved width range changes by size and product, and 710-15 calls for a narrower approved band than the smaller sizes.

A shared 15-inch diameter should not be treated as automatic permission to move between all three sizes on any wheel. A Wagon owner looking at 710-15, for example, should verify that the wheel falls in the 5.00 to 5.50 inch range before assuming compatibility. On P22, P23, and Suburban models, staying with the factory-style size is usually the cleanest route, while any change should begin with a wheel-width check rather than appearance alone.

A 1951 Plymouth should be stored in a cool, dry, dark space with the tires kept away from direct sunlight, standing moisture, and electric motors or battery chargers that create ozone. Because every listed tire for this year and make is bias-ply, long static storage can lead to flat-spotting more readily than many later radial owners expect. Keeping the car clean, maintaining proper inflation, and rolling it periodically helps reduce stress on the same contact patch month after month.

Collectors who store a 1951 Plymouth for extended periods often benefit from moving the car a short distance occasionally or using stands in a way that follows accepted restoration-shop practice for the suspension and frame. The goal is not to leave the tires bearing the same load in the same position indefinitely. If the car comes out only for events and fair-weather drives, a little extra attention during storage does more for ride quality and sidewall life than simply covering the bodywork.

Tires on a 1951 Plymouth should be judged more by age and condition than by mileage. Collector-car tires often age out before they wear out, so a good rule is to begin evaluating them closely around five to seven years and to consider replacement as they approach the ten-year mark regardless of tread depth. The manufacturing date code on the sidewall is the best starting point for that timeline, especially on a hobby car that may only be driven occasionally.

A bias-ply tire can still look presentable and have useful tread while the rubber has hardened with time, which changes how the car rides and responds. Owners of low-use Plymouths sometimes assume little mileage equals little risk, but age, storage conditions, and inflation history matter just as much. If a set has uncertain age, visible cracking, or persistent vibration that does not improve after driving, replacement is usually a smarter path than trying to stretch a few more seasons from it.

Tires on a 1951 Plymouth should be inspected before every drive and again before any longer outing. Check for sidewall cracking, cuts, bulges, uneven tread wear, and any sign that the tire is losing pressure between drives. On a collector car, these checks matter even more because the vehicle may sit for long periods and then be asked to run at sustained road speed. A quick look at the spare is worthwhile too, since it is often the oldest tire on the car.

Regular inspections are one of the simplest ways to avoid turning a pleasant vintage drive into a roadside problem. A Plymouth that feels fine around town can still reveal age-related issues once heat builds on a longer run. Make pressure checks part of the same routine, and pay special attention to valve stems during your walk-around. If anything looks questionable, address it before the trip rather than assuming an old bias-ply tire will improve once it gets rolling.

A 1951 Plymouth P22 would have originally been fitted with bias-ply tires, which was standard American passenger-car practice at the time. In the current 1951 Plymouth fitment range, the P22 uses 640-15, making that the key size to begin with when restoring the car to an era-correct look. Sidewall treatment could vary by market position and presentation, but the construction type for an original-style P22 restoration remains bias-ply rather than radial.

That means the most important authenticity decisions are the correct size, the correct bias-ply construction, and a sidewall style that suits the car’s restoration goal. Buyers pursuing strict factory-character presentation should confirm market- and trim-specific expectations with Plymouth club resources or period literature before finalizing whitewall width. For most restorations, staying with 640-15 bias-ply and choosing an appropriate sidewall appearance gets the car much closer to the right visual and driving character than focusing on brand alone.

Correct tire fitment matters on a 1951 Plymouth because judges and knowledgeable enthusiasts often notice whether the size, construction, and sidewall style suit the era and the specific model. A P22 or Suburban shown on 670-15, or a P23 shown on 640-15, can look visibly off even before anyone studies details closely. The same goes for sidewall appearance, since blackwall, narrow whitewall, and wide whitewall each create a different period impression.

For a high-level restoration, tire choice should support the exact personality of the car rather than just fill the wheel opening. Bias-ply construction is the foundation for authenticity on a 1951 Plymouth, and the remaining details come down to selecting the correct model size and an appropriate sidewall treatment. If you plan to show the car competitively, consult the relevant Plymouth club or event judging rules so the tire choice aligns with the standards used in your class.

In 1951 Plymouth 640-15 fitment, Firestone and BFGoodrich both offer bias-ply tires for 15-inch wheels, but they differ in visual emphasis and approved wheel widths. BFGoodrich appears here as a wide whitewall with a listed rim-width range of 4.00 to 4.50 inches and a maximum load rating of 1190 pounds at 32 psi. Firestone appears in both wide whitewall and narrow whitewall versions, generally with a 4.50 to 5.00 inch rim-width range, with listed load ratings up to 1190 pounds at 32 psi and one narrower-whitewall version listed at 970 pounds at 32 psi.

For a P22 or Suburban restoration, that means the choice is not just brand but also how the finished car should look and what wheel width it actually has. A car on a narrower wheel may align better with the BFGoodrich fitment window, while a slightly wider wheel may suit the Firestone range more naturally. If authenticity is the main goal, use the wheel measurement and the intended sidewall appearance together instead of choosing by brand name alone.

The listed 1951 Plymouth tires are all bias-ply products, and no explicit speed ratings are shown for these sizes here. A properly matched, correctly inflated, and sound-condition bias-ply tire can be used for normal road driving, but a 1951 Plymouth is still an early-fifties car with era-specific braking, steering, and suspension behavior that deserves respect at modern traffic speeds. Tire condition, age, balance, and alignment all matter as much as the nominal size when highway use is part of the plan.

Highway readiness on a collector Plymouth is really a whole-vehicle question rather than a tire-size question alone. Before any sustained-speed trip, make sure the tires are free from cracking or bulges, holding air properly, and mounted on suitable wheels. A fresh set of correctly sized bias-ply tires can serve well within the car’s intended use, but the safest approach is to drive with the limitations of a 1951 chassis in mind rather than expecting modern-car behavior.

The available 1951 Plymouth tires shown here commonly list load-and-pressure values at 32 psi, but those figures are tire rating references rather than blanket vehicle inflation instructions. In 640-15, listed products include 1190 pounds at 32 psi and one 970-pound rating at 32 psi. In 670-15, listed products include 1450 pounds at 32 psi and up to 1550 pounds at 32 psi. In 710-15, listed products show 1550 pounds at 32 psi.

Use the vehicle’s original inflation guidance as your baseline and then confirm the tire manufacturer’s recommendations for the exact reproduction tire you are fitting. The important thing is not to transfer one pressure assumption from one Plymouth size to another just because they all fit 15-inch rims. If your car’s handbook, restoration literature, and the tire maker’s guidance are all in agreement, you will be much closer to a setup that preserves both ride quality and tire life.

Before a longer drive in a 1951 Plymouth, inspect each tire for cracks, cuts, bulges, uneven wear, and proper inflation, and make sure the valve stems are in good condition. Confirm that the spare is usable and inflated as well, since old spares are often forgotten until they are needed. On a car of this age, tire checks should be part of a larger pre-drive routine that also includes brakes, steering, wheel bearings, fluids, and the charging system.

A longer trip places more heat and sustained load into the tire than a short local drive, so small issues become easier to feel and harder to ignore. If the car has been sitting, take it on a shorter test drive first and pay attention to vibration, pull, or pressure loss afterward. The best long-drive preparation for a 1951 Plymouth is a calm inspection routine that treats the tires as one critical part of the car’s overall mechanical readiness.