1975 Plymouth Tire Fitment Guide

1975 Plymouth vehicles use 20 different tire sizes across six model lines. Duster sizes are E70-14, ER78-14, 695-14, and D78-14; Fury sizes are G70-14, H78-14, F78-14, and G78-14; Gran Fury sizes are GR78-15, HR78-15, JR78-15, and LR78-15; Trailduster sizes are 700-15, H78-15, L78-15, E78-15, and G78-15; Valiant sizes are 695-14, D78-14, and E78-14; Wagon sizes are 700-15, E78-15, F78-15, G78-15, H78-15, L78-15, and 800-16.5. Rim diameters span 14, 15, and 16.5 inches, with size-specific rim width ranges such as 5.00-6.00 for 695-14, 6.00-7.00 for E70-14, and 6.00-6.50 for 800-16.5 where product coverage exists.

That means year and make alone are not enough to choose a tire for a 1975 Plymouth. Start by confirming the exact model, then verify the wheel diameter actually on the car or truck, especially if you are working with a Wagon or a vehicle that may have been changed over the years. Once you narrow that down, the remaining decision usually becomes construction type, sidewall appearance, and whether you want a stock-style presentation or a more road-oriented radial application where Plymouth used one.

A 695-14 on a 1975 Plymouth is an older numeric bias-ply size. The 695 portion is a nominal section-width designation in the traditional inch-based system, and the 14 is the wheel diameter in inches. On 1975 Plymouth applications, 695-14 appears on the Duster and Valiant and mounts on a 14-inch wheel. Products in this size fit rim widths from 5.00 to 6.00 inches and come in blackwall, narrow whitewall, and dual redline styles from BFGoodrich and US Royal.

Numeric sizes can look unfamiliar if you are more accustomed to modern metric radials, but they are common on older compact American cars. For a 1975 Plymouth owner, 695-14 usually points toward a traditional restoration-minded bias-ply fitment rather than a later radial conversion. If your car already wears 14-inch wheels and you want to preserve a compact 1970s appearance, this size is one of the key references to compare against the tire actually mounted on your car now.

No, 1975 Plymouth models do not use the same tire size. Compact models such as the Duster and Valiant stay in 14-inch sizes, the Gran Fury uses 15-inch radial-designated sizes, the Trailduster and many Wagon applications use 15-inch bias-ply sizes, and the Wagon also reaches an 800-16.5 fitment. Even within a single model line, several size options may appear, so one Plymouth nameplate does not always point to one tire size.

That variation matters most when a car has changed hands several times or when replacement wheels may have been installed decades ago. A buyer should confirm the model first, then check the wheel diameter and the size molded on the existing tire before settling on a replacement. Doing that early helps avoid confusing a compact-car 14-inch fitment with a full-size or wagon 15-inch setup, or mistaking a 16.5-inch Wagon application for a more common 16-inch or 15-inch wheel.

For a 1975 Plymouth Duster, E70-14 is a bias-ply size and ER78-14 is a radial size, and that is the most important difference between them. E70-14 appears in sporty period sidewall treatments such as redline, pin white stripe, and RWL, while ER78-14 represents a radial-designated fitment on the same 14-inch wheel diameter. The choice is less about one being universally right and more about whether your car is set up for the bias-ply application or the radial application.

Owners pursuing a stock mid-1970s look often gravitate toward the bias-ply E70-14 because its sidewall styles strongly match the era's visual language. Owners who are keeping a Duster in a later radial-style configuration will want to stay with ER78-14 if that is the fitment their car uses. Before deciding, compare the tire size on the car now and confirm that the wheel and overall setup match the size family you intend to use rather than switching casually between the two.

1975 Plymouth tires cover a wide range of sidewall styles depending on size. Available looks include blackwall, narrow whitewall, wide whitewall, pin white stripe, RWL, redline, dual redline, and dual white stripe. Some sizes are closely tied to sporty mid-1970s styling, such as E70-14 and G70-14 with redline or RWL treatments, while others lean more formal or family-car oriented with whitewall choices, such as H78-14, G78-14, H78-15, and L78-15.

The right sidewall for a 1975 Plymouth depends heavily on the model and the kind of restoration you are doing. A Duster often looks appropriate with performance-era sidewall graphics, while a Fury, Gran Fury, or Wagon may call for a more formal whitewall presentation. If you are preparing a judged restoration, size, construction, and sidewall treatment should all align with the way your specific Plymouth would have been presented, so event rules and marque references are worth checking before you commit.

Brands covering 1975 Plymouth applications include Firestone, Goodyear, BFGoodrich, US Royal, Coker Classic, and STA. Coverage varies by size: E70-14 comes from Firestone and Goodyear, 695-14 from BFGoodrich and US Royal, G70-14 from Firestone and Goodyear, G78-14 from BFGoodrich and Coker Classic, LR78-15 from Firestone, 700-15 from Firestone, BFGoodrich, and STA, H78-15 from Coker Classic and STA, L78-15 from Coker Classic and BFGoodrich, G78-15 from Coker Classic and STA, E78-14 from Coker Classic and STA, and 800-16.5 from STA.

That spread gives a 1975 Plymouth owner room to shop by era, appearance, and intended use rather than by size alone. Firestone and Goodyear choices often emphasize recognizable 1970s sporty styling, BFGoodrich and US Royal support traditional bias-ply restoration looks, Coker Classic covers many whitewall passenger applications, and STA reaches further into utility and transport-oriented blackwall offerings. The best approach is to narrow the size first, then compare the brands available within that exact fitment.

Rim width requirements for 1975 Plymouth tires depend on the exact size. Examples include 6.00-7.00 inches for E70-14, 5.00-6.00 for 695-14, 6.50-7.00 or 6.0-8.0 for G70-14 depending on product, 5.50-8.00 for H78-14 and LR78-15, 5.00-7.00 for F78-14, G78-14, and G78-15, 5.00-5.50 for 700-15, 5.50-7.00 for H78-15, 5.50-8.00 for L78-15, 4.50-7.00 or 5.0-6.0 for E78-14 depending on product, and 6.00-6.50 for 800-16.5.

Those ranges are a reminder that matching diameter alone is not enough, especially on collector vehicles that may have had wheel swaps during their lives. Check the actual wheel width before choosing a tire, and be careful with sizes that show different approved rim-width ranges between products. That matters most when comparing passenger-car whitewall tires with utility-oriented blackwall offerings in the same nominal size, because the intended wheel and service use can differ.

A 1975 Plymouth Duster uses 14-inch wheel diameters across its size range, including E70-14, ER78-14, 695-14, and D78-14, so the basic rim diameter stays consistent. That means original 14-inch Duster wheels may be compatible in diameter with more than one of the model's tire sizes. Rim width still matters, though, because E70-14 products fit 6.00-7.00 inch rims while 695-14 products fit 5.00-6.00 inch rims, and a radial size should never be assumed interchangeable without checking the actual wheel and setup.

In practice, that makes the Duster a model where wheel verification is still necessary even though the wheel diameter appears straightforward. A narrow stock wheel can suit one 14-inch size better than another, and cars restored for appearance may not be using the same wheel width as cars prepared for regular road use. Measure the wheel, compare it to the approved range for the exact tire you want, and avoid treating all 14-inch Duster sizes as automatically interchangeable.

A stored 1975 Plymouth should be kept out of direct sunlight, away from electric motors and ozone sources, and in a cool, dry space with stable temperature. Clean tires before storage, keep them properly inflated, and move the car periodically so the same part of the tread and sidewall is not carrying the load for months at a time. Because 1975 Plymouth applications include many bias-ply tires and some radial sizes, flat-spotting and cosmetic aging can show up differently depending on construction, with bias-ply tires often more sensitive to long static periods.

For a longer lay-up, many collectors either roll the car occasionally or support part of the weight with stands while still keeping the suspension settled appropriately. That is especially worthwhile on heavier models such as Fury, Gran Fury, Wagon, and Trailduster. A simple storage routine can preserve sidewall appearance, reduce temporary flat-spot behavior on the first drive, and help the tires stay ready for a weekend outing instead of needing attention before every seasonal use.

Tires on a 1975 Plymouth should be judged more by age and condition than by mileage, because many collector cars see limited use. A practical rule is to evaluate them closely once they are about five to seven years old and to treat around ten years from the date code as the point where replacement deserves serious consideration even if tread remains. Sidewall cracking, persistent air loss, hardening, vibration, or visible structural changes matter more than odometer miles on a vintage Plymouth.

That age-based approach is especially important because a lightly driven collector car can still spend long periods parked, exposed to heat cycles, or sitting on old inflation pressure. Check the DOT date code where present, inspect the spare as carefully as the road tires, and do not assume an older tire is acceptable simply because it looks clean from a few feet away. Collector ownership rewards caution here, since time is usually harder on old tires than distance.

Tires on a 1975 Plymouth should be inspected before every drive and again before any longer trip. Look for sidewall cracking, cuts, bulges, uneven wear, and signs that the tire is losing pressure, and inspect valve stems closely on any older setup. If the car has spent time in storage, pay extra attention to flat spots and tread distortion during the first few miles after it is back on the road.

A brief walk-around catches many of the problems that can spoil a drive in an older car, especially one that is not used daily. On wagons and utility models with heavier-duty blackwall applications, it is also smart to confirm that all tires are carrying pressure evenly and that the spare is still serviceable. Making inspection routine turns tire care into a habit rather than a repair, and that matters on a 1975 Plymouth that may sit far more than it runs.

A 1975 Plymouth Duster could use several 14-inch sizes, including E70-14, ER78-14, 695-14, and D78-14 depending on the exact application. In period terms, bias-ply construction was still very much part of the 1975 domestic market, while radial fitments were becoming more common, which explains why both a bias-ply E70-14 and a radial ER78-14 appear in the Duster range. No single original-equipment brand should be assumed across every Duster without model-specific historical confirmation.

For a restoration, the best path is to identify the exact trim, wheel, and market presentation your Duster is meant to represent, then match size, construction, and sidewall style accordingly. A sporty redline or RWL bias-ply can create a very different impression from a radial fitment even when both are era-appropriate in some contexts. Marque clubs, factory literature, and long-time Mopar specialists are the right places to confirm what is correct for your particular car.

Correct tire fitment matters a great deal when a 1975 Plymouth is being judged for authenticity. Size, construction, and sidewall style all affect whether the finished car looks right for its model and era, and judges often notice those details immediately because tires change the stance and visual tone of the whole vehicle. A modern-looking radial on a class expecting bias-ply authenticity, or an aggressive sporty sidewall on a formal full-size sedan, can stand out for the wrong reasons.

That does not mean every restored 1975 Plymouth must use the same visual treatment, because the model range was broad and included compact coupes, family sedans, wagons, and utility vehicles. It does mean the tire should support the story the car is telling. Before a judged event, compare your chosen size and sidewall to period photos, factory literature, and club guidance so the tire becomes a finishing detail that reinforces the restoration rather than a shortcut that distracts from it.

On sizes such as E70-14 and G70-14 for a 1975 Plymouth, Firestone Wide Oval and Goodyear Custom Wide Tread both represent period-style bias-ply performance looks, but their available sidewalls and dimensions are not identical. E70-14 Firestone choices appear in pin white stripe, redline, and RWL forms with a 6.00-7.00 inch rim range and weights around 22 to 23 pounds, while the Goodyear E70-14 appears in RWL form with a 6.0-7.0 inch rim range and a 24-pound weight. In G70-14, Firestone offers redline, RWL, and pin white stripe with a 6.50-7.00 inch rim range, while Goodyear offers redline with a 6.0-8.0 inch range.

For a buyer, that means the difference is as much about visual character and wheel compatibility as brand loyalty. Firestone gives more sidewall-style variety in those sizes, while the Goodyear G70-14 allows a broader rim-width window on paper. If your goal is a very specific period muscle-era look for a Duster or Fury, compare the stripe treatment first; if wheel width is a concern, compare the approved rim range product by product before making the final call.

1975 Plymouth tires can be suitable for highway use when they are the correct size, properly mounted, in good condition, and used within the limits of their construction and load rating. This year-make range is dominated by bias-ply sizes, with radial applications appearing on sizes such as ER78-14 and the Gran Fury's radial-designated 15-inch fitments, including LR78-15 in a bias-look radial form. The practical safety question for most 1975 Plymouth owners is usually overall vehicle condition, because brakes, suspension, alignment, and steering on an older car often influence highway confidence as much as the tire itself.

That means a fresh set of correct tires is only one part of roadworthiness. A full-size Fury or Gran Fury, for example, places different demands on a tire than a compact Valiant or Duster, and a Trailduster or Wagon may be carrying more load than a hobby car used only for local cruising. Before routine highway use, confirm the tire matches the wheel, the pressure is appropriate, and the rest of the vehicle is ready for sustained speed rather than assuming the tire alone defines safety.

Inflation pressure for a 1975 Plymouth should start with the vehicle manufacturer's recommendation for the exact model and tire size, then be checked against the tire's own rated pressure information. Several sizes here carry load-and-pressure references such as 1400 at 32 psi for E70-14 and E78-14 passenger-style products, 1230 at 32 psi for 695-14, 1620 at 32 psi for G70-14 and G78-15, 1770 at 32 psi for H78-14 and many H78-15 products, 1970 at 32 psi for L78-15 and LR78-15, 1710 at 60 psi for one E78-14 utility-oriented application, and 2045 at 60 psi for one 800-16.5 application.

Those numbers should not be transferred casually from one size or product to another, because a passenger-car whitewall and a heavier-duty transport tire in a nearby size can have very different intended inflation ranges. Use the Plymouth factory specification as your baseline for the vehicle, then confirm the tire's own marking and service type before inflating. On an older car, getting the pressure right helps steering feel, tread wear, and ride quality as much as it helps load carrying.

Before a longer drive in a 1975 Plymouth, inspect every tire for cracking, cuts, bulges, uneven wear, and proper inflation, and do not forget the spare. Look closely at valve stems, especially on older wheels, and make sure the tire size on the car matches the model and wheel diameter you expect. If the car has been sitting, drive a short distance first to feel for vibration, pulling, or flat-spot behavior before committing to a full day on the road.

Tires are only one part of the pre-trip routine on a 1975 Plymouth, but they are the part that keeps every other system connected to the pavement. It is smart to pair the tire inspection with checks of brakes, steering play, fluid levels, lights, and belt and hose condition. That is particularly important on large sedans, wagons, and utility models, where weight and age can amplify small mechanical issues once the trip gets longer and speeds rise.