The 1929 Willys-Knight 70B Series comes from an era when smooth, refined motoring was a major selling point, and tire choice still played a big role in how a pre-war car looked and felt on the road. For owners of this six-cylinder Willys-Knight, the fitment question centers on two period bias-ply size expressions tied to a 19-inch wheel: 29X5.50 and 550-19. That means the decision is less about modern sizing trends and more about selecting the right vintage-style presentation, including blackwall or wide whitewall options in 550-19. For restoration-minded driving, wheel measurements, appearance goals, and overall condition should all be checked before putting the car back into regular road use.
Which Tire Size Is Right for The 1929 Willys-Knight 70B Series
The 1929 Willys-Knight 70B Series uses two primary bias-ply tire size expressions, and both are tied to the same 19-inch wheel fitment. The first step is understanding which size notation matches the wheels and tire style already on the car, since the real decision usually comes down to preserving a period-style look and confirming wheel compatibility on a nearly century-old vehicle.
29X5.50 is an antique diameter-by-section size, meaning the first number refers to an approximate overall tire diameter of 29 inches and the second number refers to an approximate 5.50-inch section width. It is a bias-ply format suited to the pre-war tire conventions used on the 1929 Willys-Knight 70B Series. This notation is especially useful for owners comparing an older tire marking against what is mounted on the car now. The practical value of this size is preserving the correct vintage sizing language while still requiring a careful check of wheel dimensions and the car’s current setup.
550-19 is a numeric bias-ply size in which 550 represents an approximate 5.50-inch nominal section width and 19 identifies the rim diameter in inches. On the 1929 Willys-Knight 70B Series, this is the size with visible product choice, including BFGoodrich Silvertown Classic Bias Ply options in both blackwall and wide whitewall form. That gives owners a meaningful appearance decision without moving away from the vehicle’s period-style construction. It is the size to evaluate closely when selecting between a more understated touring look and a stronger restoration-oriented whitewall presentation.
Fitment is straightforward across the covered 1929 Willys-Knight 70B Series sub-model, since the same bias-ply sizing applies throughout. Checking the exact sub-model still matters so the tire notation on the car and the 19-inch wheel setup can be matched correctly before purchase.
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1929 Willys-Knight 70B Series 6 Cyl.
The 1929 Willys-Knight 70B Series 6 Cyl. uses the same period bias-ply sizing found across this fitment group, with both 29X5.50 and 550-19 tied to the vehicle. That makes tire selection more about matching the wheel setup already on the car and choosing the period-style sidewall presentation that best suits its restoration or touring use.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 1929 Willys-Knight 70B Series Tires for Sale
Available 550-19 choices focus on BFGoodrich Silvertown Classic Bias Ply tires with two distinct sidewall presentations: blackwall and wide whitewall. Both share the same 19-inch rim diameter and period bias-ply construction, giving the buyer an appearance-driven comparison within the correct vintage size.
Owners of a 1929 Willys-Knight 70B Series usually need clear guidance on antique tire sizing, 19-inch wheel fitment, bias-ply selection, period-style appearance, and the inspections worth making before an older collector car returns to road use.
Tire Size & Fitment
What tire size fits a 1929 Willys-Knight 70B Series?
The 1929 Willys-Knight 70B Series uses two primary bias-ply size expressions: 29X5.50 and 550-19. Those two markings reflect period sizing conventions for the same general fitment family, and the covered 6 Cyl. sub-model uses both of them on a 19-inch wheel setup.
The practical step is to compare the tire marking already on the car with the actual wheel dimensions before choosing a replacement. On an older vehicle, wheels may have been changed over time, so confirming the 19-inch rim and matching the vintage size notation helps avoid ordering a tire that suits the era but not the car’s current hardware.
What size rim does a 1929 Willys-Knight 70B Series use?
The 1929 Willys-Knight 70B Series uses a 19-inch rim with its primary tire fitment. That rim diameter aligns with the 550-19 numeric bias-ply size and the period fitment represented by 29X5.50.
Rim diameter should be confirmed at the wheel itself, especially on a pre-war car that may have seen decades of repairs or replacement parts. A tire can have the right vintage appearance and still be wrong for the wheel if the rim diameter or width does not match, so checking the actual wheel before selection is just as important as reading the tire size code.
What does 29X5.50 mean on a 1929 Willys-Knight 70B Series?
On a 1929 Willys-Knight 70B Series, 29X5.50 is an antique diameter-by-section tire size. The 29 refers to an approximate overall tire diameter in inches, while 5.50 refers to the approximate section width, also in inches.
That older sizing style can look unfamiliar next to later numeric bias-ply markings such as 550-19, but it belongs to the same vintage fitment conversation. Interpreting the code correctly helps when comparing an original-style tire marking, an older replacement tire, and the wheel that is currently on the vehicle, which is especially useful during restoration or recommissioning work.
Choosing the Right Tire
What should I consider when choosing a 550-19 tire for a 1929 Willys-Knight 70B Series?
The main considerations are keeping the correct 550-19 size, staying with bias-ply construction, and matching the tire’s appearance to the way the car will be presented. For this fitment, available choices center on BFGoodrich Silvertown Classic Bias Ply tires in blackwall or wide whitewall form.
A touring car with a more understated look may suit blackwalls, while a restoration-oriented presentation may point toward a wide whitewall. Wheel width matters too, so the rim should be checked against the tire’s specified range before installation. On a vehicle of this age, it also makes sense to inspect wheels for condition and trueness before mounting new tires.
What sidewall styles are available for 1929 Willys-Knight 70B Series tires?
For the 1929 Willys-Knight 70B Series in 550-19, the available sidewall styles include blackwall and wide whitewall. Both are offered in bias-ply form, so the difference is primarily visual rather than a change in basic construction type.
That makes sidewall choice an important part of the car’s finished look. Blackwall tends to deliver a more restrained vintage presentation, while a wide whitewall creates a brighter, more formal period-style appearance. The right choice depends on how the car is being restored, shown, or driven, rather than on any automatic rule that one sidewall suits every Willys-Knight.
What tire series are available for the 1929 Willys-Knight 70B Series?
The available 550-19 products for the 1929 Willys-Knight 70B Series are part of the BFGoodrich Silvertown Classic Bias Ply series. That means the visible choice within this fitment is not between different series families, but between sidewall presentations within the same vintage-style line.
For the buyer, that simplifies the decision. Construction type, brand family, and general period character remain consistent, while appearance becomes the main differentiator. It is still important to compare the wheel dimensions and review the tire’s load and rim-width specifications, especially if the car has been off the road for years or no longer wears its earlier wheel setup.
Restoration & Appearance
Which tire should I choose for a period-style 1929 Willys-Knight 70B Series?
A period-style 1929 Willys-Knight 70B Series should stay with its primary bias-ply fitment family, using 29X5.50 or 550-19 as appropriate for the wheel and tire notation being followed. In 550-19, BFGoodrich Silvertown Classic Bias Ply tires provide a traditional construction and visual character that suit a pre-war restoration approach.
The choice then becomes more about presentation than modernizing the car. A blackwall look can feel restrained and functional, while a wide whitewall creates a more formal vintage appearance. When exact historical originality matters, it is wise to compare the car against marque literature, period photos, or club guidance before settling on a sidewall treatment.
Does correct tire fitment matter for a 1929 Willys-Knight 70B Series restoration?
Correct tire fitment matters a great deal on a 1929 Willys-Knight 70B Series because the tire has a strong effect on stance, proportion, and overall authenticity of presentation. Using the proper vintage bias-ply size family helps the car retain the look and character expected of a late-1920s automobile.
Fitment also affects how smoothly a restoration comes together in practical terms. A tire that does not match the wheel diameter or intended profile can create problems with mounting, appearance, and road readiness. Even on a show-focused car, it is worth confirming the wheel dimensions and inspecting the rims carefully so the finished vehicle is as usable as it is attractive.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1929 Willys-Knight 70B Series?
Yes. Modifications can affect tire fitment on a 1929 Willys-Knight 70B Series, especially if the car has replacement wheels, altered suspension components, brake conversions, or body repairs that changed clearances. Even with the correct period tire size family, an older vehicle may no longer match its earlier wheel and chassis setup exactly.
That is why wheel diameter and width should be checked directly rather than assumed from the badge or model year alone. Steering clearance, fender clearance, and general wheel condition also deserve attention before mounting new tires. On a pre-war car, small changes made decades ago can still affect what works safely and what preserves the intended appearance.
What should I inspect before driving a 1929 Willys-Knight 70B Series on new tires?
Before driving a 1929 Willys-Knight 70B Series on new tires, inspect the wheels, valve stems, tire pressure, and the overall condition of the suspension and steering components. New tires cannot compensate for cracked wheels, worn linkage, poor alignment, or brake issues that are common concerns on long-stored collector vehicles.
A careful road-use check should also include looking for rubbing at full steering lock, confirming that each tire is seated properly on the rim, and making sure the car holds pressure consistently. Since older cars often spend long periods parked, it is also smart to verify that nothing in the chassis or body interferes with the tire once the vehicle is rolling.
How should 550-19 tires on a collector 1929 Willys-Knight 70B Series be maintained?
550-19 tires on a collector 1929 Willys-Knight 70B Series should be maintained with regular pressure checks, routine visual inspections, and clean storage conditions. Watch for sidewall cracking, cuts, bulges, irregular wear, and slow air loss, particularly if the car sees only occasional use.
Collector cars benefit from storage away from prolonged sunlight, excess moisture, and ozone sources such as electric motors or battery chargers. Rolling the car periodically can help reduce long-term flat spotting, and checking the wheels and tires before each outing is a good habit. On a vehicle from 1929, tire care is closely tied to overall roadworthiness.
