The 1929 Willys-Knight 66B Series comes from the late pre-war period, when sleeve-valve Willys-Knight automobiles appealed to buyers who valued smooth, refined motoring. For a car of this age, tire choice is closely tied to both appearance and proper mechanical fit, especially because wheel and tire standards differ from later collector cars. This Willys-Knight uses bias-ply fitments in 31X6.00 and 600-19, both tied to 19-inch wheel use. Available choices lean toward a traditional presentation, including a wide whitewall treatment in 600-19. The real task is confirming which period sizing convention matches the wheels on the car and selecting a tire that suits restoration priorities and careful road use.
Which Tire Size Is Right for The 1929 Willys-Knight 66B Series
The 1929 Willys-Knight 66B Series uses two primary tire sizes, and both are bias-ply fitments associated with 19-inch wheel use. Before choosing a tire, the first step is confirming which sizing convention matches the wheels and current setup on the car, since one size is expressed in an older diameter-by-section style and the other uses a numeric bias-ply format.
31X6.00 is an antique diameter-by-section size, meaning the first number refers to an approximate 31-inch overall tire diameter and the second number refers to an approximate 6.00-inch section width. It is a bias-ply fitment suited to a vehicle from the late 1920s, where older sizing conventions are common and visual authenticity matters. This format appeals to owners trying to stay close to an early tire presentation rather than moving toward later metric conventions. It is worth checking the actual wheel setup on the car so the size format and tire profile match the vehicle's restoration direction and intended road use.
600-19 is a numeric bias-ply size in which the 600 indicates an approximate 6.00-inch nominal section width and the 19 identifies the rim diameter. This is a traditional pre-war sizing format and remains highly relevant for a 1929 Willys-Knight 66B Series using 19-inch wheels. In this size, the available product selection includes a Lester Classic Bias Ply tire with a Wide Whitewall sidewall style, giving the car a distinctly restoration-oriented look. This size makes sense for owners who want a period-style tire choice while still paying close attention to wheel compatibility and overall presentation.
Fitment is straightforward across the covered sub-models because the same two bias-ply tire sizes are used here. Checking the exact sub-model still matters, but the main decision is matching the wheel setup on the car to the correct vintage sizing format.
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1929 Willys-Knight 66B Series 6 Cyl.
The 1929 Willys-Knight 66B Series 6 Cyl. uses the same pair of bias-ply fitments found across this application, so tire selection centers on choosing the right size convention rather than sorting through multiple trim-specific setups. That means confirming the wheels on the car and then deciding whether the priority is a traditional restoration look or a practical period-style replacement.
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 66B Series Tires for Sale
Available 1929 Willys-Knight 66B Series tire choices focus on traditional bias-ply construction in 600-19, with Lester offering a Lester Classic Bias Ply option in a Wide Whitewall sidewall style. The product grid is most useful for comparing period-style appearance and basic fitment details within that size.
These 1929 Willys-Knight 66B Series tire FAQs focus on the two primary sizes, 19-inch wheel fitment, bias-ply selection, period-style appearance, and the checks worth making before putting a pre-war car back on the road.
Tire Size & Fitment
What tire size fits a 1929 Willys-Knight 66B Series?
The 1929 Willys-Knight 66B Series uses two primary tire sizes: 31X6.00 and 600-19. Both are bias-ply fitments, and the covered sub-model uses the same pair of sizes rather than a separate trim-specific setup.
The key is not assuming the two size designations are interchangeable in every situation. One uses an older diameter-by-section format, while the other uses a numeric bias-ply format tied to a 19-inch rim, so the wheel on the car should be checked before choosing between them.
What size rim does a 1929 Willys-Knight 66B Series use?
The 1929 Willys-Knight 66B Series uses a 19-inch rim with its applicable tire fitment. That is stated directly with the 600-19 size and aligns with the vehicle's overall rim-diameter fitment information.
That rim measurement matters because a pre-war car may no longer be wearing its original wheel set. Before selecting a tire, confirm the actual wheel diameter on the vehicle and make sure the chosen size format matches the wheel and the way the car is currently configured.
Does the 1929 Willys-Knight 66B Series 6 Cyl. use the same tire size?
Yes. The 1929 Willys-Knight 66B Series 6 Cyl. uses the same tire sizing covered for this application, with 31X6.00 and 600-19 both associated with the sub-model. Both fitments are bias-ply selections.
That makes the sub-model question simpler than on many later collector vehicles with trim-dependent tire changes. The real next step is verifying which size convention matches the wheels on the car, especially if the vehicle has been restored, re-bodied, or fitted with replacement wheels at some point.
Choosing the Right Tire
What should I consider when choosing a 600-19 tire for a 1929 Willys-Knight 66B Series?
Start with the basics: 600-19 must match the wheel diameter, the tire should remain bias-ply if the goal is to stay within the original construction style, and the sidewall treatment should suit the car's overall presentation. A Lester Classic Bias Ply option is available in this size.
Beyond size, the decision usually comes down to how the car will be used and how traditional the finished look should be. A wide whitewall can strongly influence the car's visual character, while wheel condition, tube requirements, and the age of the rest of the rolling hardware also deserve attention.
What sidewall styles are available for 1929 Willys-Knight 66B Series tires?
The available sidewall style in the current 600-19 product selection is Wide Whitewall. On a late-1920s automobile like the 1929 Willys-Knight 66B Series, that creates a distinctly traditional and restoration-oriented appearance.
Sidewall style is more than a cosmetic afterthought on a pre-war car because it shapes how finished the vehicle looks from the curb. Owners trying to match a specific historical presentation should compare the tire's visual style with period photos, marque references, and the overall character of the restoration.
What brands offer tires for the 1929 Willys-Knight 66B Series?
Lester is represented in the available product selection for the 1929 Willys-Knight 66B Series, with a 600-19 offering in the Lester Classic Bias Ply series. That keeps the focus on a traditional bias-ply tire rather than a modernized construction.
Brand matters most here as part of the overall combination of size, appearance, and fitment details rather than as a performance ranking exercise. For a vehicle of this era, confirm the tire's size convention, wheel compatibility, and sidewall presentation first, then compare the available brand and series options within that correct fitment.
Restoration & Appearance
Which tire should I choose for a period-style 1929 Willys-Knight 66B Series?
A period-style 1929 Willys-Knight 66B Series starts with the proper vintage bias-ply sizing format, which here means working within 31X6.00 or 600-19 depending on the wheel setup. Both sizes preserve the right general construction character for a car from 1929.
Choosing between them should be guided by the wheels on the car and the look the restoration is trying to achieve. If exact historical originality matters, compare the finished tire choice with period photography, marque-club guidance, and other vehicle-specific references instead of assuming one visual treatment suits every surviving example.
Does correct tire fitment matter for a 1929 Willys-Knight 66B Series restoration?
Yes, correct tire fitment matters a great deal on a 1929 Willys-Knight 66B Series because tire size, construction, and sidewall appearance all shape how authentic the car looks and how naturally it sits on its wheels. Pre-war cars are especially sensitive to those details.
A mismatched size format or the wrong visual profile can change the car's stance even before it turns a wheel. Fitment should be checked alongside wheel diameter, wheel condition, and body clearance so the restoration reflects the car's era rather than simply accepting any tire that seems close.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1929 Willys-Knight 66B Series?
Yes. Any change to wheels, hubs, suspension height, brake components, or fender clearance can affect tire fitment on a 1929 Willys-Knight 66B Series. That is especially important on a pre-war vehicle, where replacement parts and past restorations may have altered the original setup.
Even when the car is supposed to be stock, it is worth checking the actual wheel diameter and how the tire sits within the body opening before making a final choice. Small changes in hardware can matter on an older chassis, so visual and mechanical verification should come before road use.
What should I inspect before driving a 1929 Willys-Knight 66B Series on new tires?
Inspect the wheels for condition and true diameter, make sure the tires are seated correctly, and check for adequate clearance at the fenders, steering components, and suspension. It is also wise to look over valve stems, tubes where applicable, and the overall condition of the rims themselves.
A pre-war car often spends long periods parked, so the rest of the rolling chassis deserves attention too. Brake function, wheel bearing condition, alignment, and inflation should all be reviewed before a road test, since a new set of tires cannot compensate for worn or neglected supporting components.
How should 600-19 tires on a collector 1929 Willys-Knight 66B Series be maintained?
600-19 tires on a collector 1929 Willys-Knight 66B Series should be kept properly inflated, inspected regularly for cuts, cracking, bulges, and uneven wear, and protected from long exposure to sunlight, heat, moisture, and ozone sources. Low-use collector cars can age tires even when tread still looks good.
Routine checks matter more than mileage on an older hobby car that may spend much of its life in storage. Occasional movement helps avoid long-term flat spotting, and any persistent air loss or visible sidewall deterioration should be addressed before the car is driven any meaningful distance.
