1955 Plymouth P27-1, 27-2 & 27-3 Tires

The primary tire size for the 1955 Plymouth P27-1, 27-2 & 27-3 is 670-15. That is a numeric bias-ply size used on a 15-inch rim, and the covered V8 sub-model uses that same primary fitment as well.

That makes the first step fairly simple: confirm the car is still running the expected 15-inch wheels and then choose among the available 670-15 tire styles. If the Plymouth has been modified with different wheels or if a radial alternative is being considered, wheel width and vehicle clearance should be checked before moving away from the original-style size and construction.

The 1955 Plymouth P27-1, 27-2 & 27-3 uses a 15-inch rim with its primary 670-15 tire fitment. That rim diameter is the foundation for both the original-style bias-ply fitment and the radial-equivalent sizes that stay in the same wheel diameter family.

Rim diameter is only part of the fitment picture, so wheel width still matters when comparing specific tires. Some 670-15 products are intended for narrower rims, while radial equivalents are associated with a 5- to 7-inch recommended rim-width range, making it smart to verify the actual wheel dimensions on the car before choosing a tire.

A size like 670-15 is a vintage numeric bias-ply designation. The 670 refers to an approximate 6.70-inch nominal section-width class, and the 15 identifies the wheel diameter in inches.

For a 1955 Plymouth, that older sizing format matters because it shapes both the tire's appearance and the kind of replacement options available. It also explains why modern radial alternatives use very different-looking size codes such as 195R15 or P205/75R15, even though they are considered equivalents rather than additional primary factory-style sizes.

For the 1955 Plymouth P27-1, 27-2 & 27-3, 670-15 is the primary bias-ply tire size. The available products tied to that main fitment are bias-ply tires, which align with the period-style construction used on this Plymouth.

That matters because staying with bias-ply preserves the traditional size format and visual presentation of the car. A switch to radial construction is a separate decision and should be treated as an equivalent-size conversion, with attention paid to wheel width, overall dimensions, and clearance rather than assuming any radial option automatically duplicates the original setup.

Radial equivalents for 670-15 include 195R15, P205/75R15, P215/70R15, and 670R15. Those represent an 80-series metric radial, a 75-series P-metric radial, a 70-series P-metric radial, and a bias-look radial equivalent, respectively.

Each of those sizes keeps the conversation in a 15-inch wheel family, but they are not identical in format or profile style. The radial equivalents are associated with a recommended rim-width range of 5 to 7 inches, so the actual wheel width on the Plymouth should be confirmed before choosing one, along with clearance around the fenders and steering components.

Start by confirming the wheel diameter and actual wheel width on the car, then compare the intended radial equivalent against the Plymouth's available space. For this application, 195R15, P205/75R15, P215/70R15, and 670R15 are the radial sizes to evaluate rather than guessing at a substitute.

The next checks are practical ones: steering clearance at full lock, fender and suspension clearance, and the general condition of the suspension and alignment. A collector car that has been lowered, fitted with aftermarket wheels, or sitting on tired springs can react differently than a stock example, so conversion should be approached as a measured fitment decision, not a simple tire swap.

Start with the correct primary size and construction: 670-15 in bias-ply form on a 15-inch rim. From there, the real choice is between sidewall appearance, brand, tire series, and the rim-width specifications tied to the individual tire.

A Plymouth aimed at restoration display may call for a different visual treatment than one built for regular fair-weather driving. It also helps to compare product details such as load figures where stated, tire weight when relevant, and whether the wheel on the car matches the rim-width range expected by the tire under consideration.

The 670-15 choices for the 1955 Plymouth P27-1, 27-2 & 27-3 include blackwall, narrow whitewall, and wide whitewall sidewall styles. That gives owners room to lean toward a simpler utility look, a restrained mid-century presentation, or a fuller whitewall appearance.

Sidewall style can change the car's visual character more than many buyers expect, especially on a mid-1950s sedan. The best choice depends on the look of the wheel covers, trim, and overall restoration direction, while still keeping the tire in the proper primary size and making sure the selected product matches the wheel dimensions on the car.

Available 670-15 tires for the 1955 Plymouth P27-1, 27-2 & 27-3 come from Firestone, BFGoodrich, Goodyear, US Royal, Universal Vintage Tire, Coker Classic, Excelsior, Avon, and STA. Those brands appear across several period-style bias-ply series and sidewall treatments.

Brand choice is usually less about declaring a single winner and more about selecting the presentation and specifications that suit the car. Comparing series names, sidewall style, rim-width guidance, and load figures where stated will usually tell an owner more than the brand name alone when narrowing down the right 670-15 option.

A period-style starting point for a 1955 Plymouth P27-1, 27-2 & 27-3 is a 670-15 bias-ply tire on a 15-inch rim. That keeps the car in its original-style size format and opens the door to traditional blackwall, narrow whitewall, or wide whitewall presentations.

The right choice depends on how the Plymouth is being finished rather than on one universal answer. Buyers chasing a highly specific restoration look should compare the tire's sidewall treatment against period photos, marque references, and vehicle-specific documentation, while drivers seeking the general mid-1950s appearance can usually focus on the sidewall style that best complements the car.

Tire construction changes both the look and the stance impression of a restored 1955 Plymouth. A 670-15 bias-ply preserves the vintage numeric size format and the traditional visual character most owners expect on a mid-1950s Plymouth.

A radial equivalent can still be a sensible option, especially a 670R15 bias-look radial, but it should be chosen with an eye toward presentation as well as fitment. Owners balancing road use and appearance often compare how much traditional sidewall style they want to retain before deciding whether to stay with bias-ply or move to a radial alternative.

Yes, modifications can change tire fitment on a 1955 Plymouth P27-1, 27-2 & 27-3 even when the tire size appears correct on paper. Different wheel widths, altered wheel offset, suspension changes, or body modifications can all affect how a 670-15 or its radial equivalents sit in the car.

That is why a modified Plymouth should be measured, not assumed. Wheel diameter and width should be confirmed first, then steering and fender clearance should be checked through the suspension's range of motion, especially if the car has been lowered, fitted with non-stock wheels, or converted to a different tire construction.

Before putting a 1955 Plymouth P27-1, 27-2 & 27-3 back on the road with new tires, inspect the wheels for condition, confirm the lug hardware is correct, and make sure the tires are seated properly and inflated appropriately for the chosen product. A basic check of steering and suspension condition is worthwhile as well.

A short low-speed test drive can reveal rubbing, pull, vibration, or clearance issues before the car is used more seriously. It also helps to recheck pressure after the initial drive and look again for any signs of contact inside the wheel opening, particularly if the car has older suspension parts or a wheel setup that differs from stock.

Collector-car tires in 670-15 size should be inspected regularly for cracking, cuts, bulges, uneven wear, and gradual air loss, even if the Plymouth is driven only occasionally. Maintaining consistent inflation and moving the car periodically can also help reduce stress from long-term storage.

Storage conditions matter just as much as mileage on a lightly used car. Keeping the Plymouth away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve the tires, and a pre-drive walkaround before each outing is a smart habit because age-related issues often show up long before the tread looks worn.