Buick 50 Series Tires

Buick 50 Series uses six sizes across the 1930-1935 production span: 31X6.50 for 1930, 650-19 for 1930, 5.25-18 for 1931, 550-18 for 1932, 6.00-17 for 1933, and 700-16 for 1934-1935. Among the sizes with available products, 650-19 fits a 19-inch rim, 550-18 fits an 18-inch rim, and 700-16 fits a 16-inch rim. The pattern shows a steady reduction in wheel diameter as the series progressed through the early 1930s.

That means Buick 50 Series fitment has to be matched to both year and actual wheel diameter on the car. A 1930 Buick 50 Series needs especially careful checking because two different sizes are listed for that year. Start with the wheel itself, then compare the size stamped on any surviving tire, the owner’s literature, and the year listing before choosing a replacement.

On Buick 50 Series, 31X6.50 is an antique diameter-by-section size used in 1930. The 31 refers to the tire’s approximate overall outside diameter in inches, while 6.50 refers to the nominal section width. That is different from later modern-looking sizes, because the first number is not the wheel diameter.

That distinction matters because a buyer can easily mistake 31 for a rim size when it is actually the outside diameter of the mounted tire. With Buick 50 Series, the wheel diameter for an antique-format size has to be confirmed from the wheel itself and from the specific fitment evidence for the car. If your 1930 car has this style of size reference, verify the wheel before moving to a replacement tire.

A 1930 Buick 50 Series has 31X6.50 and 650-19 listed because more than one configuration existed within that model year. Those two sizes are not simply alternate spellings of the same tire; they represent different fitment paths and require the car to be checked more closely than later single-size years in the series.

If your Buick 50 Series is a 1930 car, do not select by year alone. Measure the rim, inspect any surviving wheel markings, and compare what is on the car with original service literature or a Buick marque specialist’s guidance. That extra step is the safest way to separate a correct 1930 fitment from an easy but expensive mismatch.

Buick 50 Series uses several rim diameters across its production run. The available fitments show 19-inch wheels in 1930 with 650-19, 18-inch wheels in 1931-1932 with 5.25-18 and 550-18, 17-inch wheels in 1933 with 6.00-17, and 16-inch wheels in 1934-1935 with 700-16. For antique-format sizing such as 31X6.50, the wheel diameter is not expressed by the leading number and has to be confirmed separately.

That stepped reduction in wheel size is one of the most important Buick 50 Series buying details on the page. A tire can look roughly appropriate in profile yet still be wrong for the wheel underneath it. Checking the wheel diameter first will usually narrow the correct choice faster than starting with tread style, brand, or sidewall appearance.

To confirm the correct tire size for a 1930 Buick 50 Series, begin with the wheel diameter and then compare that against the two listed 1930 sizes: 31X6.50 and 650-19. The key difference is that 650-19 is tied to a 19-inch rim, while 31X6.50 uses antique sizing where the first number is overall tire diameter rather than wheel size.

Once the wheel diameter is known, check any surviving tire markings, wheel stamps, and period Buick literature associated with the specific car. Cars that have been restored or re-wheeled over the years may no longer match what their model year alone suggests. That is why the best confirmation process for a 1930 Buick 50 Series is year, wheel diameter, and surviving physical evidence together.

Buick 50 Series tires are available in blackwall, wide whitewall, and double-whitewall styles within the product range shown here. The 650-19 offerings include blackwall and wide whitewall choices, 550-18 adds double-whitewall options, and 700-16 is offered in blackwall and wide whitewall. That gives early 1930s Buick owners room to match both restoration goals and personal presentation.

For a Buick 50 Series restoration, the right sidewall style should follow the appearance you are trying to recreate rather than being treated as a universal upgrade. A formal restoration, preservation car, and touring driver may each call for a different look even when the tire size is the same. Match the sidewall treatment to the car’s year, trim character, and intended show standard before making the final selection.

Buick 50 Series tires in the listed sizes come from Firestone, Lester, Excelsior, BFGoodrich, Michelin, Avon, Tornel, and STA. Not every brand appears in every size, but the available range covers traditional passenger-car bias-ply lines as well as some truck and military-style 700-16 offerings. The broadest selection is in 700-16, while 650-19 and 550-18 also have multiple brand choices.

Brand choice should come after fitment, not before it. On Buick 50 Series, confirm the correct size and wheel diameter first, then compare brands by sidewall style, series, and intended use. That approach keeps a restoration buyer from forcing a preferred brand into the wrong year or wheel configuration just because the name is familiar.

Buick 50 Series products appear in several series families, including Firestone Classic Bias Ply, Lester Classic Bias Ply, Firestone Balloon, Comp H, Silvertown Classic Bias Ply, Double Rivet, Traction Mileage, Firestone Classic Military, Tornel Classic Truck, and Military NDT. Those series reflect different design approaches, from period-style passenger tires to balloon construction and truck or military-pattern tires in 700-16.

The practical takeaway is that two tires in the same Buick 50 Series size may still serve very different purposes. A whitewall passenger-car bias-ply tire suits a restoration far differently than an NDT or truck-style tread in the same nominal size. Once size is settled, compare the series name to the job the car will actually do: show presentation, general collector driving, or utility-style use.

A Buick 50 Series should be stored in a cool, dry, dark space with the tires kept away from direct sunlight, ozone sources, heaters, welders, and electric motors. 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, rolling it occasionally or supporting it to reduce sustained load can help preserve shape.

That matters more on a prewar Buick 50 Series than on a modern daily driver because collector tires often spend long stretches carrying weight without much road heat cycling. Clean the tires with mild soap and water only, and avoid dressings that can leave residues or accelerate cracking. A little storage discipline goes a long way toward protecting both appearance and service life.

Tires on a Buick 50 Series should be inspected before every drive and more thoroughly several times during the season. Look for sidewall cracking, tread separation, impact damage, irregular wear, valve stem issues, and changes in air retention. On a bias-ply prewar application, small visible changes can matter because the car may spend much of its life parked and then be expected to run after long idle periods.

A practical inspection routine for Buick 50 Series includes checking pressure cold, looking at the tread and sidewalls with the wheel turned for full access, and verifying that the tire still sits evenly on the rim. If the car develops vibration, pull, or unusual ride harshness, stop and inspect again rather than driving through it. Early discovery is usually what saves both the tire and the wheel.

Buick 50 Series tires should be replaced when age, cracking, casing deterioration, repeated air loss, or structural irregularity makes them questionable, even if the tread still looks deep. Collector cars often wear out tires by time rather than mileage, and bias-ply tires can age visibly at the sidewall and bead before the tread seems finished. Tread depth alone is not a reliable measure of remaining serviceability on an early 1930s car.

For Buick 50 Series owners, replacement decisions should be conservative because the car’s steering, braking, and suspension were designed around period tire behavior, not around pushing old rubber past its useful life. Any tire with uncertain age, long-term flat spotting, or visible structural distress deserves prompt attention. If a car carries older spare or take-off tires, have them treated as emergency display pieces unless a specialist judges them roadworthy.

Buick 50 Series originally used the size families associated with its production years, including 31X6.50 and 650-19 in 1930, 5.25-18 in 1931, 550-18 in 1932, 6.00-17 in 1933, and 700-16 in 1934-1935. The available products also show several period-style series approaches, including classic bias-ply, balloon, and other era-correct constructions within certain sizes.

For a specific Buick 50 Series restoration, the exact original fitment should be tied back to the car’s year and configuration rather than assumed from the broader model family. Factory literature, surviving unrestored examples, and Buick marque references remain the best final authority for judging-level accuracy. That is especially true for 1930, where more than one tire size appears within the same model year.

Correct tire fitment can absolutely affect both the presentation and perceived value of a Buick 50 Series. Size, stance, sidewall treatment, and tread character all change how authentically the car reads, and knowledgeable judges often notice tire details quickly because they are so visible. A Buick 50 Series wearing the wrong diameter or an obviously mismatched style can look out of period even when the rest of the restoration is strong.

For owners pursuing show judging, the safest course is to match the tire size and visual style to the exact year and configuration of the Buick 50 Series. Marque clubs, period photographs, and factory literature are more useful than broad restoration habits. Even outside the show field, correct tire fitment helps the car sit properly and supports a more convincing period appearance.

Buick 50 Series tires are offered here in blackwall, wide whitewall, and double-whitewall styles, depending on size. Any of those may suit an early 1930s restoration, but the correct look depends on the specific year, trim character, and how formally the car was presented. A blackwall gives a restrained period appearance, while whitewall variants create a more dressed and upscale look that many restorers prefer on Buicks of the era.

The right answer for a Buick 50 Series restoration comes from matching the sidewall style to the car’s intended finish standard. If the goal is marque judging, compare your choice to period Buick sales material and unrestored reference cars. If the goal is a tasteful touring restoration, choose the sidewall treatment that complements the car without compromising the correct size and wheel diameter.

A Buick 50 Series can be driven on public roads when it is fitted with sound, age-appropriate tires in the correct size and the rest of the car is mechanically prepared for road use. The listed Buick 50 Series offerings are bias-ply designs, which are appropriate to the era but behave differently from modern radials in steering feel, braking response, and tracking. Safe road use depends on the entire vehicle system, not on tread depth alone.

In practice, a Buick 50 Series owner should treat the car as a prewar collector automobile rather than as ordinary transportation. Keep speeds sensible, allow extra braking distance, and avoid assuming modern emergency-handling capability. Tire condition, wheel condition, brake performance, and steering integrity should all be reviewed together before regular public-road use.

Before driving a Buick 50 Series, check cold tire pressure, inspect the sidewalls and tread, confirm that the tires are seated properly on the rims, and look for any cuts, bulges, or signs of separation. Because Buick 50 Series uses several wheel diameters across its years, it also makes sense to confirm that all four road wheels and the spare match the intended fitment for the car.

A short walk-around before each outing is especially important on a collector Buick 50 Series that may sit for weeks between drives. Also verify wheel fasteners, steering response, brake feel, and the condition of the valve stems before heading onto public roads. Catching a mismatch or aging issue in the garage is far easier than dealing with it after the car is underway.

A Buick 50 Series should be driven at moderate, conservative speeds that respect both the capabilities of bias-ply tires and the mechanical limits of an early 1930s automobile. Even with correct new production tires, the driving experience is different from a modern car, with more sensitivity to road crown, steering input, and braking distance. If the car carries older tires of uncertain age, caution should increase substantially.

The smartest approach for Buick 50 Series road use is to build speed gradually, pay close attention to how the car feels, and keep use aligned with touring, local road, and event driving rather than sustained high-speed work. Traffic conditions matter as much as the speedometer. Leave room around the car, avoid abrupt maneuvers, and let the Buick’s period character set the pace.