1973 Plymouth Road Runner Tires

The 1973 Plymouth Road Runner uses two primary tire sizes: F70-14 and G70-14. Both are vintage alphanumeric bias-ply sizes designed for 14-inch rims, and both are associated with the Road Runner Base configuration.

Choosing correctly means confirming which size is already on the car or which wheel setup it currently uses. Since both sizes share the same rim diameter, the real difference is not 14-inch versus 15-inch fitment, but which of the two Road Runner bias-ply sizes best matches the wheels, appearance, and overall tire dimensions you want to maintain.

The primary tire fitments for the 1973 Plymouth Road Runner both use a 14-inch rim diameter. That applies to F70-14 and G70-14, so either original-style tire size is built around the same basic wheel diameter.

Rim diameter is only one part of the fitment picture, especially on a collector car that may have had wheels changed over the years. It still helps to verify the wheel width before selecting a tire, because the available F70-14 and G70-14 products carry different rim-width recommendations depending on the size and tire series.

A 1973 Plymouth Road Runner can be associated with both F70-14 and G70-14, even though both are bias-ply tires for 14-inch rims. The difference is within the tire size itself rather than a change in basic rim diameter or a move from bias-ply to radial construction.

That matters because two cars wearing 14-inch wheels may still need different tires. Before ordering, check the size on the existing tires, confirm the wheel width, and look at overall clearance around the fenders and suspension so the replacement matches the Road Runner’s current setup rather than only the model name.

F70-14 is a bias-ply tire size for the 1973 Plymouth Road Runner. It uses the vintage alphanumeric system common to the era, and the available primary products in this size are built in bias-ply construction rather than as modern radial tires.

That distinction matters because a bias-ply tire preserves the traditional shape and presentation many owners want on a period muscle car. Anyone considering a radial alternative should compare wheel width, overall dimensions, and clearance first, since a radial equivalent may share the same general fitment role without duplicating every characteristic of the original-style bias-ply tire.

For F70-14, radial equivalents include 195R14, P205/75R14, P215/70R14, and the bias-look radial 750R14. For G70-14, the radial equivalents are 205R14, P215/75R14, P225/70R14, and the bias-look radial 800R14.

These options give a Road Runner owner several ways to move from vintage alphanumeric bias-ply sizing into metric, P-metric, or bias-look radial sizing. The equivalent category helps describe the format, but it does not remove the need to check wheel width, overall dimensions, and clearance around the car before making a construction change.

Start by matching the Road Runner’s original-style size to the correct radial equivalent category, then confirm the wheel diameter and wheel width. F70-14 and G70-14 both have radial-equivalent options, but each equivalent still needs to be evaluated against the actual wheel and vehicle setup.

A conversion is also a good time to inspect suspension condition, steering travel, and clearance at the fenders and inner wheelhouses. Cars that have aftermarket wheels, altered ride height, or worn components can respond differently than a stock setup, so the goal is to verify compatibility before assuming any equivalent will behave like the bias-ply tire it replaces.

Start with the correct primary size for the car’s current setup, since the 1973 Plymouth Road Runner uses both F70-14 and G70-14 in bias-ply construction. From there, the meaningful differences are wheel-width compatibility, tire series, sidewall treatment, and whether you want to stay with a traditional bias-ply presentation or compare radial equivalents separately.

An owner focused on period style may lean toward a bias-ply tire with a sidewall treatment that suits the car’s look, while a driver-oriented choice may begin with the equivalent-size discussion first. It also helps to compare load figures and general dimensions within the correct size rather than assuming every 14-inch muscle-car tire serves the same role.

1973 Plymouth Road Runner tires in F70-14 and G70-14 are available with several sidewall styles, including redline, raised white letter, pin white stripe, and blackwall. The exact combination depends on the tire size, brand, and series being considered.

Sidewall style affects the car’s visual character more than the size designation itself, especially on a muscle-era Plymouth where the tire makes a strong impression in profile. Once the correct size is confirmed, the sidewall choice becomes a useful way to tune the look toward a more understated, more sporty, or more restoration-oriented presentation.

Firestone and Goodyear both offer bias-ply tire options for the 1973 Plymouth Road Runner in the applicable F70-14 and G70-14 sizes. Across those brands, the available series include Firestone Wide Oval and Goodyear Custom Wide Tread, with Speedway Wide Tread also available in F70-14.

Brand choice is only one part of the decision, because each size can also vary by sidewall style and rim-width specification. A better comparison starts with the correct F70-14 or G70-14 fitment, then looks at the available series and appearance details so the tire matches both the car’s wheel setup and its intended presentation.

A period-style 1973 Plymouth Road Runner usually starts with the correct primary bias-ply size already on the car, either F70-14 or G70-14. From there, Firestone and Goodyear offer era-appropriate looking tire series and sidewall treatments that keep the car in a traditional muscle-car visual lane.

The best choice depends on whether the goal is a restrained street look, a bolder raised white letter presentation, or a stripe treatment that suits the rest of the build. When exact restoration accuracy matters, it is worth comparing the tire choice with marque references, historical photos, or vehicle-specific documentation before settling on a final style.

Tire construction changes more than ride feel on a restored 1973 Plymouth Road Runner; it also changes the car’s visual character. A bias-ply tire keeps the original-style alphanumeric sizing format and traditional presentation, while a modern radial equivalent introduces a more contemporary sizing approach even when chosen carefully.

That is why many restoration-minded owners decide on appearance first and construction second. A standard metric or P-metric radial can be useful as an alternative, while a bias-look radial offers a middle ground for someone who wants radial construction but still prefers a more vintage-looking tire profile and sidewall presence.

Yes, modifications can affect tire fitment on a 1973 Plymouth Road Runner even when the car still uses a 14-inch wheel. Changes such as aftermarket wheels, different wheel widths, altered ride height, brake upgrades, or suspension work can influence which of the primary sizes or radial-equivalent alternatives is practical.

A Road Runner that no longer sits or steers like a stock example should be checked at full lock and through suspension travel before finalizing a tire choice. That is especially important when moving between F70-14 and G70-14 or when considering a metric radial equivalent, because small setup changes can alter available clearance.

Before putting miles on a 1973 Plymouth Road Runner with new tires, inspect the wheels for correct diameter and condition, make sure lug hardware is appropriate, and verify that the tires have adequate clearance at the fenders, suspension, and steering components. Tire pressure should also be set correctly for the tire being installed.

It also helps to look beyond the tires themselves. Collector cars often sit for long periods, so worn shocks, tired bushings, loose steering parts, or uneven ride height can affect how new tires behave on the road. A short local drive followed by a second inspection is a smart way to catch rubbing or settling issues early.

F70-14 and G70-14 tires on a collector 1973 Plymouth Road Runner should be maintained with regular pressure checks, visual inspections, and attention to age-related condition. Even a car that is driven sparingly can develop issues such as sidewall cracking, flat spotting, cuts, or slow air loss if the tires spend long periods parked.

Storage conditions matter almost as much as mileage on a hobby car. Keeping the Road Runner away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve the tires, and occasional movement helps prevent long-term set in one spot. Before any longer trip, confirm tread condition and give each tire a careful walkaround.