1956 Plymouth P29-1, 29-2 & 29-3 Tires

The 1956 Plymouth P29-1, 29-2 & 29-3 uses two primary tire sizes: 670-15 and 710-15. Both are bias-ply sizes for 15-inch rims, and the covered 8-cylinder application can use either one depending on the vehicle's exact wheel and tire setup.

That means the right starting point is not guessing by year alone, but confirming what is already on the car and measuring the wheel width if needed. A Plymouth that has been restored, updated, or simply changed over time may no longer match its earlier setup, so verifying the existing size helps narrow the correct bias-ply choice or the proper radial equivalent.

Both primary tire sizes used on the 1956 Plymouth P29-1, 29-2 & 29-3 mount on 15-inch rims. That shared rim diameter applies to 670-15 and 710-15, so the key fitment difference between the two sizes is not wheel diameter, but the overall tire sizing and the wheel-width range suited to each tire.

Rim diameter alone does not settle the choice, especially if the car has replacement wheels or a long-ago tire change. Checking the actual wheel width matters because available 670-15 and 710-15 products are paired with different rim-width specifications, and that affects whether a given tire is an appropriate match for the wheel already on the Plymouth.

The 1956 Plymouth P29-1, 29-2 & 29-3 can be found with either 670-15 or 710-15, both in bias-ply construction on 15-inch rims. In practical terms, that means this application is not locked to one universal size across every car carrying the same core model designation.

For a buyer, the important takeaway is to identify the actual wheel and tire setup on the vehicle instead of selecting by model name alone. A car wearing 670-15 may call for a different visual stance and wheel-width match than one using 710-15, and that becomes even more important when comparing whitewall styles or considering a radial-equivalent conversion.

For the 1956 Plymouth P29-1, 29-2 & 29-3, 670-15 is a primary bias-ply tire size. It belongs to the vintage numeric bias-ply system and is offered in period-style bias-ply products, including blackwall, narrow whitewall, and wide whitewall versions from several classic brands.

That matters because a true bias-ply tire preserves the original-era construction style and visual character of the car. Owners comparing choices should still verify wheel width and intended use, since a bias-ply selection aimed at restoration appearance may lead to a different decision than a Plymouth being set up for regular road miles with a radial equivalent.

Radial equivalents for 670-15 are 195R15, P205/75R15, P215/70R15, and 670R15. Radial equivalents for 710-15 are 205R15, P215/75R15, P225/70R15, and 710R15. In each group, the options include an 80-series metric radial, a 75-series P-metric radial, a 70-series P-metric radial, and a bias-look radial.

Those sizes give different paths depending on whether the goal is a more conventional modern radial format or a radial that keeps a more traditional visual impression. The next step is checking wheel width, overall wheel compatibility, and available clearance on the car, since an equivalent size should be treated as an alternative to evaluate rather than an automatic interchange.

A conversion starts with identifying whether the Plymouth uses 670-15 or 710-15, then matching that size to the correct radial-equivalent group. From there, verify the wheel diameter, the wheel width, and whether the specific radial option falls within the recommended rim-width range tied to that original size.

Clearance at the fenders and steering should be reviewed before the change, especially on a car with replacement wheels, suspension work, or years of parts changes. It also helps to decide whether the car is being kept visually traditional, in which case a bias-look radial may be more appropriate than a lower-profile P-metric alternative.

The first decision is confirming whether the car uses 670-15 or 710-15, since both are primary fitments for this Plymouth application. After size is settled, compare construction style, rim-width compatibility, sidewall presentation, and whether the car is being selected for restoration appearance, occasional touring, or regular road use.

A blackwall can give a plainer period look, while narrow and wide whitewalls change the car's visual character dramatically. Brand and tire series matter as well, not because one is automatically better, but because available products differ in details such as load specification, recommended wheel width, and the type of traditional presentation they bring to the finished car.

Tires for the 1956 Plymouth P29-1, 29-2 & 29-3 are available in blackwall, narrow whitewall, and wide whitewall styles. Those choices appear across both 670-15 and 710-15, giving owners flexibility to keep the car understated or lean into the brighter mid-1950s look often associated with the period.

Sidewall style should be chosen after the correct size is confirmed, since the same visual treatment may not be available in the same way across every product line. It also helps to think about the overall finish of the car, because a wide whitewall creates a much stronger visual statement than a narrow whitewall or blackwall on a full-size Plymouth.

Available brands for this Plymouth include Firestone, BFGoodrich, US Royal, Universal Vintage Tire, Goodyear, and a few specialty offerings in certain size listings. The mix depends on whether the car uses 670-15 or 710-15, but both sizes have several restoration-oriented bias-ply choices across established vintage tire lines.

Brand should be treated as one part of the decision rather than the whole decision. After confirming the correct size, compare the tire series offered by each brand, the available sidewall treatments, and the wheel-width specifications attached to the product, since those details usually have a bigger effect on the finished result than the brand name alone.

A period-style choice for a 1956 Plymouth P29-1, 29-2 & 29-3 usually starts with staying in the original bias-ply family and selecting the correct primary size, either 670-15 or 710-15. From there, the most visible decision becomes sidewall treatment, since blackwall, narrow whitewall, and wide whitewall options can all change the car's finished presentation.

For many restorations, the right tire is the one that supports the era and trim level the car is meant to represent without overstating the look. When exact originality matters, it is wise to compare surviving photos, marque references, or other vehicle-specific historical material before settling on a whitewall width or particular period-style series.

Tire construction changes both the visual stance and the overall impression of a restored 1956 Plymouth P29-1, 29-2 & 29-3. A bias-ply tire keeps the vintage construction style associated with the car's original era, while a radial equivalent can alter the presentation even when the size is chosen to stay within the same general fitment range.

That difference is especially noticeable on a 1950s full-size car where the tire sidewall is an important part of the look. Owners who want radial construction without losing as much traditional character may want to examine the bias-look radial options tied to 670-15 or 710-15, then compare them carefully against the car's wheel setup and restoration goals.

Yes, modifications can affect tire fitment on a 1956 Plymouth P29-1, 29-2 & 29-3 even when the tire size itself is correct for the model. Aftermarket wheels, wheel-width changes, suspension work, lowering, brake conversions, or body repairs can all change how a 670-15, 710-15, or radial-equivalent tire sits in the wheel opening.

A modified Plymouth should be checked at full steering travel and through normal suspension movement before any final tire choice is made. Even small setup changes can influence clearance at the fender edge or inner wheelhouse, so the safest approach is to confirm the actual wheel dimensions and the car's current ride height instead of relying on catalog fitment alone.

Before driving a 1956 Plymouth P29-1, 29-2 & 29-3 on new tires, inspect the wheels for correct diameter and width, make sure lug hardware is appropriate, and confirm that the tires are inflated properly for the selected product. A quick visual check for rubbing points, suspension wear, and steering interference is also worthwhile.

Once the car is on the ground, roll it slowly and recheck clearance rather than assuming everything is settled from a static installation. It also helps to inspect brake hoses, wheel bearings, and alignment-related wear, because a collector car that has sat for long periods can reveal problems only after fresh tires make the car roadworthy again.

Collector-car tires in 670-15 or 710-15 should be maintained with regular pressure checks, periodic visual inspection, and attention to age-related condition even if tread wear is minimal. On a low-use 1956 Plymouth, sidewall cracking, flat spotting, cuts, bulges, and slow air loss often matter more than tread depth alone.

Storage conditions also make a difference, especially for a car that spends long periods parked. Keeping the Plymouth away from prolonged sunlight, moisture, and ozone sources helps preserve the tires, and moving the car occasionally can reduce long-term stress on one contact patch. Any tire showing visible deterioration deserves close inspection before road use.