Plymouth Road King Tires

The Plymouth Road King in this fitment range uses 550-16 tires. That size is listed for 1940, and the available products are built around a 16-inch rim diameter. All of the listed offerings are bias-ply tires rather than radial designs, so the fitment centers on a period-style construction matched to the original-era wheel size.

That makes selection fairly straightforward, but it is still worth checking the actual wheels on the car before choosing a tire. Many restored cars have had wheels changed over the decades, and sidewall style can also affect the finished appearance. Once the 16-inch wheel is confirmed, the main decision becomes blackwall versus wide whitewall and which period-style brand or series best suits the restoration.

A 550-16 Plymouth Road King tire uses an older numeric bias-ply size format. The 550 indicates a nominal section width of about 5.50 inches, written without a decimal point, and the 16 indicates the wheel diameter in inches. In the available Plymouth Road King offerings, that size is consistently paired with 16-inch rims and bias-ply construction.

Modern buyers often expect later alphanumeric or metric sizing, so this earlier numeric system can look unfamiliar at first glance. For a Plymouth Road King, the important takeaway is that 550-16 is both a size and a construction-era clue: it points you toward a period-correct bias-ply tire rather than a modern radial conversion. Matching that code correctly helps preserve the car's stance, wheel fit, and prewar character.

The Plymouth Road King fitment listed here uses a 16-inch rim diameter. Every available 550-16 product for this model is built around a 16-inch wheel, and some products also specify compatible rim widths of 3.25 to 4.00 inches. That consistency is helpful because there is no year-to-year rim diameter split within this model range.

Even with a single listed rim size, a hands-on wheel check is still worthwhile on any prewar car. Replacement wheels, later service parts, and long-ago modifications are common in collector ownership. Confirming the 16-inch diameter on the actual wheel before mounting tires avoids an expensive mismatch and helps ensure the tire sits properly on the rim the way Plymouth Road King owners expect.

Yes, the Plymouth Road King fitment listed here should be treated as a tube-type application. The available 550-16 tires are all bias-ply products in an early numeric size format, which aligns with tube-required fitment practice for prewar collector cars. Nothing in the listed offerings suggests a tubeless radial conversion or a later modern fitment approach.

That matters during installation because the tube, flap condition if applicable, and wheel condition all affect reliability. On a Plymouth Road King that is driven only occasionally, tube age can become just as important as tread depth. A careful mounting inspection of the rim, valve area, and tire interior is part of getting the right result on a restored or preserved prewar car.

Plymouth Road King tires in 550-16 are available in both blackwall and wide whitewall form. The listed wide whitewall options include BFGoodrich 2.25 Inch Whitewall and Firestone 2.50 Inch Whitewall, while blackwall choices appear from Excelsior, Avon, BFGoodrich, and Firestone. That gives Plymouth Road King owners both restrained and dressier period-style visual options within the correct size.

Choosing between them depends on how the car is being presented. A blackwall often suits a more understated, factory-like appearance, while a wide whitewall can emphasize a fully restored show-car look. The best choice is the one that matches the trim level, restoration goal, and photographic or historical references for the specific Plymouth Road King being finished.

Four brands are represented in the available Plymouth Road King tire selection: Excelsior, Avon, BFGoodrich, and Firestone. All are offered in the 550-16 size, and the available series include Excelsior Bias Ply, Avon Tourist Crossply, BFGoodrich Silvertown Classic Bias Ply, and Firestone Classic Bias Ply. Each keeps the fitment within a period-appropriate bias-ply format for the car.

That means the brand decision is less about changing the basic fitment and more about balancing appearance, series preference, and restoration style. Some owners prefer the look associated with a particular sidewall treatment or legacy name, while others want a simpler blackwall presentation. Once the size and wheel diameter are confirmed, comparing brand character and sidewall style becomes the most useful next step.

The Plymouth Road King offerings include several distinct tire series: Excelsior Bias Ply, Tourist Crossply from Avon, Silvertown Classic Bias Ply from BFGoodrich, and Firestone Classic Bias Ply. All are bias-ply tires in 550-16, but they differ in branding, series identity, and sidewall presentation. Some are offered as blackwalls, while others are available as wide whitewalls aimed at a more formal restoration look.

For a Plymouth Road King owner, those series differences matter most in how the finished car presents visually and how closely the tire matches a preferred period style. They do not change the core wheel diameter requirement, which remains 16 inches across the board. A restorer should choose the series that best fits the intended character of the car, whether that is a modest driver, a preserved survivor, or a more polished show restoration.

A Plymouth Road King should be stored in a cool, dry, dark space with the tires kept away from direct sunlight, ozone sources, and prolonged contact with oil or solvents. Proper inflation matters even when the car is parked, because underinflation can distort a bias-ply casing over time. If the car will sit for extended periods, moving it slightly from time to time helps reduce flat spotting.

Prewar bias-ply tires benefit from a little more care than modern daily-driver tires because collector cars often spend long intervals parked. Clean, stable floors and a consistent environment do more for tire longevity than occasional cosmetic dressing. If the Plymouth Road King is stored through an off-season, regular visual checks for sidewall cracking, moisture exposure, and pressure loss are worth building into the routine.

Tires on a Plymouth Road King should be inspected before each drive and more thoroughly at regular intervals even if the car sees very limited mileage. A prewar bias-ply tire deserves close attention to inflation, sidewall condition, tread separation signs, valve condition, and any changes in the way the car steers or rides. Tube-type assemblies also need periodic inspection because issues can begin inside the casing or at the valve stem.

That routine is especially important on collector cars that look fine cosmetically but spend most of their life parked. Long periods of inactivity can hide age-related deterioration until the car is finally driven. A careful owner should make tire inspection part of the same ritual as checking fluids, brakes, and wheel fasteners before taking a Plymouth Road King out on the road.

A Plymouth Road King tire should be replaced when age, cracking, hardening, uneven shape, vibration, or casing deterioration becomes evident, even if the tread still looks usable. Collector tires often age out long before they wear out, especially on low-mileage prewar cars. Visible tread depth alone is not a reliable measure of serviceability on an older bias-ply tire and tube-type assembly.

That is why replacement decisions should be driven by condition and age, not only miles traveled. Any Plymouth Road King that has sat for years should have its tires evaluated closely before being returned to use, including inspection of the tubes and wheel condition. A conservative replacement schedule is the better approach when preserving a prewar car that may be mechanically sound but only driven occasionally.

The Plymouth Road King fitment listed here centers on one size: 550-16. The available replacement tires for that size are all bias-ply offerings, including series from Excelsior, Avon, BFGoodrich, and Firestone. That supports a period-correct replacement approach built around numeric sizing and bias-ply construction, which is consistent with a 1940 Plymouth Road King restoration.

Original delivery details can still vary by how a specific car was equipped or restored over the years. For a highly exact restoration, owners should compare the car's surviving evidence, factory literature, and marque-club guidance against the available 550-16 choices. Doing that helps narrow the decision from simply correct size and construction to the tire style that best fits the car's historical presentation.

Yes, correct tire fitment can influence both the judged authenticity and the overall presentation value of a Plymouth Road King. Size, bias-ply construction, wheel diameter, and sidewall style all contribute to whether the car looks visually right for the period. Even when the body and paint are excellent, an incorrect tire profile or an obviously modern-looking replacement can distract from the restoration.

That does not mean every Plymouth Road King must wear the same sidewall style, but it does mean the tire choice should match the restoration goal. Club judging standards, period photography, and marque specialists are the best references when originality matters. On a car of this era, the tires are part of the silhouette, so getting them right is one of the details that enthusiasts notice immediately.

Plymouth Road King tires are available here in both blackwall and wide whitewall styles, all in the correct 550-16 size. Blackwall options appear from several brands, while BFGoodrich and Firestone wide whitewalls provide a more dressed-up period look. Either can suit a prewar restoration depending on the specific presentation being pursued.

The right choice depends on how the particular Plymouth Road King is being restored rather than on size alone. A simpler driver-oriented restoration may look most natural on blackwalls, while a more formal or fully detailed car may benefit from the visual presence of a wide whitewall. Period photos, surviving cars, and Plymouth enthusiast references are the best ways to settle that final appearance question.

A properly fitted new bias-ply tire in the correct 550-16 size can be suitable for public-road use on a Plymouth Road King when the rest of the car is equally roadworthy. Tire safety on a prewar car depends on more than tread alone; wheel condition, tube condition, brake performance, steering condition, and alignment all matter. The listed tires are period-style products, so they should be treated as part of a complete vintage driving system.

That means a Plymouth Road King should be evaluated as a whole before regular road use. Even the correct new tire cannot compensate for worn suspension parts, damaged wheels, or neglected brake hardware. Owners who drive only occasionally should still check pressures, visible condition, and general vehicle readiness every time the car goes out, because collector cars can deteriorate quietly between uses.

Before driving a Plymouth Road King, check tire inflation, visible sidewall condition, valve stems, wheel fasteners, and any signs of uneven wear or casing distortion. On a prewar bias-ply setup, you should also pay attention to how the car feels at very low speed as it begins to roll, since pull, thump, or wobble can signal a tire, tube, or wheel issue. The tire size itself should be confirmed as 550-16 on 16-inch wheels.

A short pre-drive inspection is especially valuable on collector cars that may sit for weeks between outings. Looking at the tires should be part of a broader check that includes brakes, steering free play, fluid levels, and lights. If the Plymouth Road King has been parked for a long period, giving the tires extra attention before road use is a sensible step rather than a formality.

A Plymouth Road King running period-style 550-16 bias-ply tires should be driven with the expectations appropriate to a 1940 prewar car, not a modern highway sedan. Even with fresh tires, bias-ply construction, older steering geometry, and collector-car braking performance call for measured speeds and generous following distance. The safe pace is the one that respects the condition of the entire car and the road environment around it.

In practical terms, that means building speed gradually, avoiding abrupt lane changes, and staying within the comfort range of the car rather than chasing modern traffic flow. A Plymouth Road King in good mechanical condition can be enjoyable on secondary roads and moderate touring use, but the tire choice should reinforce a conservative driving style. Stability, predictability, and mechanical sympathy matter more here than outright speed.