1951 Plymouth P23 Tires

The 1951 Plymouth P23 uses a 670-15 tire size. That is a vintage numeric bias-ply size fitted to a 15-inch rim, and it applies to both the Cambridge 6 Cyl. and Cranbrook 6 Cyl. versions covered here.

Since the size itself is consistent, the next step is choosing the tire style that suits the car and its use. A restoration-oriented car may lean toward a traditional bias-ply with the desired sidewall treatment, while a driver-focused car may prompt a look at radial equivalents after confirming wheel width, overall clearance, and the car's actual wheel setup.

The 1951 Plymouth P23 uses a 15-inch rim with its primary 670-15 tire size. Product options in this fitment show rim-width specifications that commonly fall around 4.50 to 5.00 inches, with some variation depending on the tire series.

That makes it important to verify both diameter and width before choosing a replacement tire, especially on an older car that may have had wheels changed over time. Matching the tire to the actual wheel helps maintain proper bead seating, appearance, and clearance, and it becomes even more important if a radial equivalent is being considered.

Yes. The covered 1951 Plymouth P23 Cambridge 6 Cyl. and Cranbrook 6 Cyl. sub-models both use the same 670-15 bias-ply tire size. That keeps fitment simple at the year-make-model level because the primary size does not change between those sub-models.

Even with shared sizing, it is still smart to inspect the car's current wheels before ordering tires. Many collector vehicles have seen wheel replacements, long periods of storage, or partial restorations, so confirming the actual 15-inch wheel setup and intended tire appearance helps avoid choosing a sidewall style or construction that does not suit the car.

For the 1951 Plymouth P23, 670-15 is the primary bias-ply tire size. That numeric format is typical of the period and matches the traditional construction used on this early 1950s Plymouth fitment.

Keeping a bias-ply tire usually makes the most sense when the goal is a period-style appearance and driving character. A buyer considering a radial should treat that as a separate alternative rather than the same construction in a different brand, and should verify wheel width, tire proportions, and fender and steering clearance before changing the setup.

Radial equivalents for 670-15 include 195R15, P205/75R15, P215/70R15, and 670R15. These cover an 80-series metric radial, a 75-series P-metric radial, a 70-series P-metric radial, and a bias-look radial option for owners who want a more traditional visual presentation.

Each of those sizes should be treated as an alternative sizing path rather than an automatic substitute. A recommended rim-width range of 5 to 7 inches is associated with the radial-equivalent group, so wheel width, tire-to-body clearance, and the car's actual ride height and suspension condition should all be checked before making the change.

Start by confirming the wheel diameter and width on the car, then compare the intended radial equivalent against available space at the fenders, suspension, and steering components. On a 1951 Plymouth P23, that matters because the original fitment is a 670-15 bias-ply, while radial alternatives follow different sizing conventions.

The decision is not just about whether a radial exists in a comparable size. The car's wheel dimensions, condition of suspension and steering parts, and any past modifications all influence the result, so the safest approach is to verify the complete setup before changing construction and to inspect the wheels closely on any long-stored vehicle.

Start with the correct 670-15 size and the 15-inch wheel, then narrow the choice by construction, sidewall style, brand, and tire series. For a 1951 Plymouth P23, the main options stay within bias-ply construction, but the visual character can change substantially between blackwall, narrow whitewall, and wide whitewall designs.

Wheel width should also be matched to the tire's specifications, since some 670-15 products call for slightly different rim-width ranges. Load figures and product weight may matter as well for owners who drive the car regularly, while restoration-minded buyers often focus more heavily on whether the sidewall treatment supports the appearance they want.

The 1951 Plymouth P23's 670-15 tire size is available in blackwall, narrow whitewall, and wide whitewall styles. That gives the car a broad visual range, from a more restrained utility look to a brighter early 1950s presentation with a more pronounced whitewall treatment.

Choosing among them depends on how the Plymouth is being finished and driven. A blackwall can suit a more understated or service-oriented look, while narrow and wide whitewalls push the car toward a more dressy restoration style. Since all of these styles exist within the same primary size, the visual decision can be made without stepping away from the correct fitment format.

Tires for the 1951 Plymouth P23 in 670-15 are available from Firestone, US Royal, Coker Classic, Universal Vintage Tire, BFGoodrich, Excelsior, Avon, Goodyear, and STA. Those brands appear across a mix of blackwall and whitewall offerings, along with several distinct vintage-oriented tire series.

Brand choice should be considered alongside the tire's construction, sidewall style, and rim-width requirements rather than as a standalone decision. Some products also differ in maximum load figures and intended presentation, so comparing the full specification set is more useful than choosing by brand name alone when narrowing the right tire for a particular Plymouth.

A period-style 1951 Plymouth P23 begins with the correct 670-15 bias-ply size on a 15-inch rim. That keeps the tire format consistent with the era, and the remaining choice usually comes down to whether the car looks right to you in blackwall, narrow whitewall, or wide whitewall form.

For a driver that still needs a traditional look, a bias-look radial equivalent may also enter the conversation, but appearance and construction are not the same thing. When exact originality matters, brand details and whitewall proportions should be checked against marque references, photos, or restoration documentation specific to the individual car.

Tire construction affects more than road feel on a restored 1951 Plymouth P23; it also changes the visual impression of the car. A 670-15 bias-ply preserves the vintage sizing format and the traditional profile associated with early 1950s American sedans, while a radial alternative introduces a more modern construction approach.

That does not automatically make one choice right or wrong, but it does change the restoration conversation. Owners aiming for a strongly period-style presentation often stay with bias-ply tires, while owners prioritizing road use may consider a radial equivalent and then decide whether a standard radial look or a bias-look radial better suits the finished car.

Yes. Modifications can affect tire fitment on a 1951 Plymouth P23 even when the intended tire size is still 670-15 or a known radial equivalent. Changes to wheel width, wheel offset, ride height, springs, or steering components can all alter how much room the tire has in real driving conditions.

That is why an older Plymouth should be checked as it sits now rather than assumed to remain in its original wheel and suspension configuration. Looking at lock-to-lock steering clearance, fender space, and the actual wheel dimensions helps prevent surprises, especially when a radial alternative or a wider-looking sidewall treatment is under consideration.

Before driving a 1951 Plymouth P23 on new tires, inspect the wheels for condition and correct size, confirm proper inflation, and check that the tires clear the fenders and steering components throughout the full range of motion. It is also wise to look over suspension and steering parts on any collector car that has seen age or storage.

A new set of tires cannot compensate for worn hardware, bent wheels, or poor alignment. The first road test should be gradual, with attention to vibration, pull, rubbing, or air loss, and a follow-up inspection after a short drive can help catch installation or clearance issues before the car is used more regularly.

670-15 tires on a collector 1951 Plymouth P23 should be maintained with regular pressure checks, routine visual inspection, and careful storage habits. Sidewall cracking, weathering, cuts, bulges, irregular tread wear, and unexplained air loss all deserve attention, especially on a car that is driven infrequently or parked for long periods.

Collector vehicles benefit from being stored away from prolonged sunlight, excess heat, moisture, and ozone-producing equipment. Even when tread wear is low, age and storage conditions still matter, so the tires should be inspected before seasonal driving and again before any longer trip to make sure the car is ready for dependable road use.