1968 Plymouth Tire Fitment Guide

1968 Plymouth vehicles use 15 sizes across five model groups: Barracuda uses 695-14, D70-14, and E70-14; Belvedere and Satellite use 735-14, 775-14, 825-14, 855-14, and F70-15; Fury uses 825-14, 855-14, 8.45-15, 855-15, 8.25-15, and 815-15; Road Runner and GTX use F70-14; and Valiant uses 650-13 and 700-13. Rim diameters span 13, 14, and 15 inches, with confirmed rim-width ranges varying by size from 4.00-5.00 inches up to 5.50-8.00 inches where product coverage exists.

That spread means year and make alone are not enough to choose a tire for a 1968 Plymouth. Start by identifying the exact model, then confirm whether the car is on 13-, 14-, or 15-inch wheels, because several Plymouth lines of the same year use completely different diameters and proportions. Once that is settled, you can narrow sidewall style and brand without risking a mismatch between the tire and the wheel.

D70-14 is an alphanumeric bias-ply size used on the 1968 Plymouth Barracuda. In that format, the letter-and-number combination identifies the tire’s size family, while the 14 is the wheel diameter in inches. It is not the same coding system as older numeric sizes such as 695-14, even though both mount on 14-inch wheels. Firestone offers D70-14 in RWL, redline, and pin white stripe forms, with a 1320-pound load rating at 32 psi and a 6-inch rim requirement.

For a Barracuda owner, the practical takeaway is that D70-14 is a distinct period muscle-era fitment rather than just another way of writing 695-14. The sidewall treatment changes the car’s personality noticeably, especially on a late-1960s sporty compact. If your Barracuda already has 14-inch wheels, confirm the wheel width before choosing among the available sidewall styles so the tire and rim stay in the proper range.

No. 1968 Plymouth models do not share a single tire size across the lineup. Barracuda, Belvedere and Satellite, Fury, Road Runner and GTX, and Valiant each have their own fitment patterns, and only a few sizes overlap between model groups, such as 825-14 and 855-14 between Belvedere and Satellite and Fury. Road Runner and GTX center on F70-14, while Valiant stays in 13-inch sizing that does not cross over to the larger Plymouth lines.

That matters because choosing by appearance alone can lead you into the wrong diameter or section width for the car you actually own. A 1968 Plymouth muscle car, intermediate sedan, and compact all sit in very different tire families even when they come from the same showroom year. If there is any doubt, identify the exact model first and compare the wheel diameter on the car before making a final tire choice.

1968 Plymouth tire choices cover a broad range of period sidewall styles depending on size. Blackwall, narrow whitewall, wide whitewall, redline, dual-redline, whitewall-redline, pin white stripe, and raised white letter options all appear across the size range. Smaller Valiant sizes lean toward whitewall presentation, larger full-size Fury and Belvedere sizes often emphasize whitewall or blackwall traditional looks, and Barracuda, Road Runner, and GTX sizes bring in sporty redline and RWL treatments that fit late-1960s performance styling.

The right sidewall choice depends less on pure fitment than on the look you want the car to project. A show-focused restoration often benefits from matching the era and market character of the model, while a driver may simply favor the sidewall style that best suits the wheels and trim already on the car. Narrowing the correct size first keeps that appearance choice anchored to a tire that still fits the wheel properly.

1968 Plymouth tire coverage comes from BFGoodrich, Firestone, Goodyear, US Royal, and Coker Classic, with brand availability varying by size. BFGoodrich appears heavily in numeric bias-ply passenger sizes such as 695-14, 735-14, 775-14, 825-14, 855-14, 855-15, and 815-15. Firestone and Goodyear dominate the alphanumeric performance sizes such as D70-14, E70-14, F70-14, and F70-15, while US Royal and Coker Classic support several traditional whitewall applications, especially in compact and mid-size fitments.

That brand spread gives 1968 Plymouth owners room to choose a tire that suits the model’s personality as well as the required size. A Valiant or Fury restoration often calls for a different visual mood than a Road Runner, GTX, or performance-oriented Barracuda, even though all remain within the period bias-ply world. Once you have the correct size nailed down, comparing the available sidewall styles by brand usually becomes the next meaningful decision.

For 1968 Plymouth Road Runner and GTX applications, both Firestone and Goodyear offer F70-14 bias-ply tires, but their sidewall style spread differs. Firestone covers pin white stripe, redline, and RWL treatments, while Goodyear appears in RWL form. Both carry a 1500-pound load rating at 32 psi where load figures are shown, and rim-width coverage runs 6.00 to 7.00 inches for Firestone and 6.0 to 7.0 inches for Goodyear. Product weight sits at 24 pounds for Firestone and 25 pounds for the Goodyear example here.

The practical difference is mostly visual rather than one of fitment, since both share the same basic size and wheel diameter. Buyers who want more sidewall-style flexibility may gravitate toward Firestone, while those who prefer a Goodyear-branded RWL look can stay in the same size family. On a 1968 Plymouth muscle car, that sidewall detail has a strong effect on the finished stance and period feel.

Rim width depends on the exact 1968 Plymouth size. Confirmed ranges include 650-13 at 4.50-5.00 inches, 700-13 at 4.00-5.00, 695-14 at 5.00-6.00, 735-14 at 5.00-5.50, 775-14 at 5.00-6.00 or 5.50-6.00 depending on product, 825-14 at 5.00-6.00, 855-14 at 5.50-6.00, D70-14 at 6, E70-14 at 6.00-7.00, F70-14 at 6.00-7.00, F70-15 at 5.50-8.00, 855-15 at 6.00-6.50, and 815-15 at 5.00-6.50 inches.

That range is wide enough that two tires with the same rim diameter may still want different wheel widths. Before mounting anything on a 1968 Plymouth, compare the actual wheel width on the car to the tire’s acceptable range instead of assuming every 14-inch or 15-inch Plymouth tire behaves the same. That step matters most on Barracuda, Belvedere and Satellite, and Fury models, where multiple sizes can exist within the same family.

The 1968 Plymouth product range here does not use TT or TL markings in the size descriptions, so tube requirements should be confirmed by the specific tire and wheel combination rather than assumed from the size code alone. Every size on this page is a bias-ply fitment, and many collector vehicles from this era can run tube-type or tubeless arrangements depending on the wheel design, condition, and the exact reproduction tire being used.

That makes the wheel itself part of the decision, especially if your 1968 Plymouth still wears original steel wheels or has been restored with refinished rims. A wheel that seals well for one tire may not be the right candidate for another setup if the bead seat, valve opening, or overall condition differs. Checking the tire’s sidewall marking and the wheel’s condition before installation is the safest path.

Original 1968 Plymouth wheels cannot be treated as universal across all 15 tire sizes because the lineup spans 13-, 14-, and 15-inch rim diameters. A Valiant’s 13-inch wheel will not accept Barracuda, Road Runner, GTX, Fury, or most Belvedere and Satellite sizes, and a 15-inch Fury or Belvedere application does not interchange with a 14-inch muscle-car tire just because the sidewall style looks similar. Diameter comes first, then wheel width.

Within a given diameter, some overlap is possible, but only after the wheel width is checked against the tire’s acceptable range. That is especially important on 1968 Plymouth models where multiple sizes exist on the same basic platform. If the car has replacement wheels or a past owner changed the diameter, verify the stamped wheel size or measure the wheel directly before choosing a tire by appearance.

A stored 1968 Plymouth should be kept out of direct sunlight, away from electric motors and other ozone sources, and on a clean, dry surface rather than bare dirt or damp concrete. Bias-ply tires, which cover the entire fitment range here, can develop flat-spotting more readily during long periods of inactivity, especially if the car sits in one position for months. Keeping the tires properly inflated and moving the car periodically helps reduce casing stress.

For longer storage, many collectors either reposition the car from time to time or use stands to reduce constant load on the tires. The goal is not just preserving tread, but protecting sidewalls and overall shape on a vintage Plymouth that may see seasonal use rather than daily mileage. A breathable indoor environment does more for tire longevity than any dressing or cosmetic treatment.

Tires on a 1968 Plymouth should be judged more by age and condition than by miles driven. A collector tire often deserves close evaluation once it reaches the five- to seven-year range, and many owners treat around ten years as the point where replacement moves into serious consideration even if tread depth still looks generous. The DOT date code on the tire remains the most reliable way to track age once the tire is in service.

That approach matters because many vintage Plymouths accumulate very little annual mileage, which can make older tires look deceptively healthy. Rubber hardens, sidewalls age, and internal materials continue to change whether the car is driven or not. On a low-use Barracuda, Fury, Road Runner, GTX, Belvedere, Satellite, or Valiant, condition and age almost always matter more than odometer math.

Tires on a 1968 Plymouth should be inspected before every drive and again before any extended trip. Look for sidewall cracking, weathering, tread separation, bulges, uneven wear, punctures, and pressure loss, and include the valve stems in the routine even if the tires appear visually fresh. On collector cars, long periods between drives can hide problems that would be obvious on a regularly used vehicle.

A quick walkaround is helpful, but a hands-on pressure check and close look at both sidewalls is a better habit. Cars that sit for weeks or months at a time can lose pressure gradually, and underinflation is hard on any bias-ply construction. If the spare is still part of your roadside plan, inspect it on the same schedule so it is not the oldest and least-ready tire on the car.

The 1968 Plymouth Barracuda used bias-ply sizing, with 695-14, D70-14, and E70-14 appearing across the model’s fitment range. That aligns with the period, when bias-ply construction was still the standard American passenger-car and performance-tire choice. The exact original sidewall treatment could vary with how the car was ordered, so a Barracuda restored for factory-style accuracy should consider both size and appearance rather than focusing on wheel diameter alone.

For a faithful restoration, the best starting point is the size tied to your exact Barracuda application, followed by the sidewall style that matches the car’s intended presentation. A base-oriented or understated car can call for a very different look than a sporty, stripe-equipped example from the same year. For market- or trim-specific confirmation beyond the basic size family, a Plymouth or Mopar marque specialist is still the right final reference.

Correct tire fitment matters on a shown 1968 Plymouth because judges and knowledgeable enthusiasts notice size family, construction type, and sidewall style very quickly. A Valiant on wide muscle-era lettering, a Road Runner on a family-car whitewall, or a Fury on the wrong diameter can change the car’s character enough to stand out even to non-specialists. Since every 1968 Plymouth application here is bias-ply, staying within the proper size family and era-appropriate sidewall treatment is central to authenticity.

What counts as correct can still vary by event, especially between concours judging, marque meets, and local shows. Some owners prioritize exact presentation down to stripe width, while others simply want a believable late-1960s appearance. If the car will be judged seriously, match the size to the model first, then confirm the sidewall style expectations with the rules for that event or with a Plymouth club that knows the platform well.

On the 1968 Plymouth Valiant, both 650-13 and 700-13 are bias-ply 13-inch sizes, but they differ in proportion, sidewall presentation, and wheel-width range. The 650-13 appears from Coker Classic and US Royal in wide whitewall and narrow whitewall form, with a 1150-pound load rating at 32 psi and a 4.50-5.00 inch rim-width range. The 700-13 appears from Firestone as a wide whitewall tire, with a 1270-pound load rating at 32 psi and a 4.00-5.00 inch rim-width range.

For restoration work, that difference means the tire choice can subtly shift the Valiant’s visual balance as well as its period impression. A buyer trying to match a very specific showroom or family-sedan look may prefer one sidewall style over another even before considering brand. Because both sizes fit 13-inch wheels, confirming the wheel width helps narrow which of the two makes more sense on the actual car.

1968 Plymouth tire coverage here is entirely bias-ply, and bias-ply tires can be perfectly serviceable for normal road use when they are fresh, properly inflated, and matched to the correct wheel. No speed letters appear in these size descriptions, so highway suitability comes down more to condition, proper inflation, and the car’s overall mechanical state than to a published speed symbol in the size code. On a late-1960s Plymouth, brakes, steering, suspension, and alignment are often just as important as the tire itself.

The practical point is to think of the tire as one part of a complete system rather than as a stand-alone answer. A well-sorted Barracuda, Fury, Road Runner, GTX, Belvedere, Satellite, or Valiant can be enjoyable on modern roads, but it should still be driven within the limits of its age and design. Before longer highway use, inspect the tires carefully and make sure the rest of the chassis is equally ready.

Many 1968 Plymouth tire options here carry maximum load figures at 32 psi, including 695-14 at 1230 pounds, D70-14 at 1320, E70-14 at 1400, 735-14 at 1360, 775-14 at 1580, 825-14 at 1620, 855-14 at 1740, F70-15 at 1500, 855-15 at 1710, 815-15 at 1610, F70-14 at 1500, 650-13 at 1150, and 700-13 at 1270 pounds. Those figures are tire ratings, not blanket vehicle pressure recommendations for every 1968 Plymouth application.

Use the factory manual or period tire placard as the first guide for the car, then compare that with the tire manufacturer’s recommendations for the exact reproduction tire you choose. A full-size Fury, compact Valiant, and muscle-oriented Road Runner do not automatically want the same operating pressure just because several tires share a 32 psi rating point. Pressure should always match the vehicle, the exact size, and the way the car is being used.

Before a longer drive in a 1968 Plymouth, inspect each tire for cracking, cuts, bulges, irregular wear, and proper cold inflation pressure. Check the age of the tires if there is any question about how long they have been on the car, and look over the valve stems and the spare as part of the same routine. Since these Plymouth applications are all bias-ply, even a car with generous tread can still need attention if it has spent long periods parked.

That tire check should happen alongside a broader mechanical review that suits a late-1960s car: brakes, cooling system, steering feel, suspension condition, lights, and fluid levels all deserve attention before a serious outing. A tire problem rarely arrives with much warning on a collector car that has been idle. Giving the whole car a careful once-over turns the drive from a gamble into a planned trip.