1949 Buick Tire Fitment Guide

1949 Buick vehicles use three different tire sizes depending on model. The 40 Special uses 650-16 on 16-inch rims, the 50 Super uses 760-15 on 15-inch rims, and the 70 Roadmaster uses 820-15 on 15-inch rims. Where rim-width guidance is available, 650-16 fits 4.50 to 5.00-inch rims, 760-15 fits 5.50 to 6.00-inch rims, and 820-15 fits 6.00 to 6.50-inch rims.

That means year and make alone are not enough for a correct selection on a 1949 Buick. The first check is the exact model, and the second is the wheel diameter actually on the car, especially if the vehicle has been restored or modified over the years. Once those two points line up, you can narrow the choice further by sidewall style and brand.

On a 1949 Buick, 650-16 is a numeric bias-ply tire size. The 650 portion is the nominal section-width code in the older numeric system, and the 16 identifies the rim diameter in inches. For 1949 Buick applications, this size belongs to the 40 Special and mounts on a 16-inch wheel.

Modern buyers sometimes expect a metric code with width, aspect ratio, and construction all spelled out, but older American sizes are simpler and more era-specific. If your Buick is a Special and still uses its correct 16-inch wheels, 650-16 keeps you in the proper sizing family. The next step is choosing between blackwall and wide whitewall versions to suit the car's presentation.

No, 1949 Buick models do not share one universal tire size. The Special uses 650-16, the Super uses 760-15, and the Roadmaster uses 820-15. Buick also split the lineup by wheel diameter, with the Special on 16-inch rims and the Super and Roadmaster on 15-inch rims.

That difference matters because a tire that is correct for one 1949 Buick model may be wrong in both size and wheel diameter for another. It also means visual stance and sidewall proportion change across the lineup, which is important on a restored car. Confirm the model name on the vehicle first, then verify the actual wheel before settling on a tire size.

1949 Buick tires are available in several period-style sidewall treatments depending on size. The 650-16 size offers blackwall and wide whitewall options, 760-15 offers narrow whitewall and wide whitewall options, and 820-15 offers blackwall, narrow whitewall, and wide whitewall options. All of the listed choices are bias-ply tires, so the visual decision centers on sidewall appearance rather than a change in construction type.

For a late-1940s Buick, whitewalls are often the look collectors associate with an upscale postwar presentation, especially on Super and Roadmaster models, while blackwalls can suit a more restrained or utilitarian restoration approach. Show standards can vary by body style, market, and event. If authenticity is especially important, compare your car against period photos and Buick club guidance before choosing a whitewall width.

Several brands cover 1949 Buick fitments, but the mix changes by size. The 650-16 size for the Special is offered by BFGoodrich, Coker Classic, Firestone, and Garfield. The 760-15 size for the Super is offered by BFGoodrich, Coker Classic, and Universal Vintage Tire. The 820-15 size for the Roadmaster is offered by BFGoodrich, Firestone, and US Royal.

That brand spread gives Buick owners room to choose a tire that matches both the model and the intended visual style. Some lines lean more heavily into classic whitewall presentation, while others also provide blackwall options in the same size family. Once you know the correct size, comparing brands makes the most sense by sidewall appearance, stated load rating where provided, and rim-width suitability.

For 1949 Buick Roadmaster fitment in 820-15, BFGoodrich and Firestone both offer bias-ply tires with a listed maximum load capacity of 1920 pounds at 32 psi and a rim-width range of 6.00 to 6.50 inches on the examples that carry full specifications. The visible difference in the listed options is sidewall presentation, since BFGoodrich appears in both blackwall and narrow whitewall versions while Firestone is shown in blackwall form. Weight also differs, with the BFGoodrich blackwall at 28 pounds and the Firestone blackwall at 33 pounds.

That means the practical choice is less about basic fitment and more about appearance and the brand character you want on the car. If you are matching a specific restoration theme, the available sidewall style may decide the issue quickly. For a Roadmaster that still wears stock-size wheels, both remain within the same size family, so visual preference and specification details should guide the final selection.

Rim-width guidance varies by 1949 Buick tire size. The 650-16 size used on the 40 Special is listed for 4.50 to 5.00-inch rims. The 760-15 size used on the 50 Super is listed for 5.50 to 6.00-inch rims. The 820-15 size used on the 70 Roadmaster is listed for 6.00 to 6.50-inch rims.

Those ranges matter because the correct tire size still needs to be paired with a wheel that supports the tire's shape and load properly. A car that has had wheels swapped during restoration can end up with the right diameter but the wrong rim width. Before mounting new tires, confirm the wheel dimensions on the car rather than assuming every original-looking steel wheel is the same.

The listed 1949 Buick tire offerings do not carry tube-type or tubeless markings in the size descriptions shown here, so the practical approach is to confirm the sidewall marking on the exact tire and match that to the wheel being used. That matters especially on postwar cars, where original wheels and later replacement wheels can differ in construction and sealing characteristics.

For setup purposes, tube choice should never be treated as automatic just because a tire is bias-ply or because the car is from 1949. Verify the product's sidewall designation, inspect the wheel condition, and consider whether the rim is the original style or a later substitute. If the wheel has questionable sealing surfaces or has been restored after heavy corrosion, that is another reason to inspect carefully before final assembly.

Original 1949 Buick wheels cannot be treated as universal across all three tire sizes because the lineup used both 16-inch and 15-inch rim diameters. The 40 Special uses a 16-inch wheel with 650-16 tires, while the Super and Roadmaster use 15-inch wheels with 760-15 and 820-15 tires respectively. Rim-width ranges also differ by size, so even among the 15-inch applications the intended wheel is not identical.

A Buick owner should think of wheel reuse by model family, not by year alone. A 15-inch wheel from a Super is not automatically the right choice for a Roadmaster unless its width also falls within the proper range, and a Special's 16-inch wheel is a different fitment path entirely. Measure and verify the wheel before assuming interchangeability during a restoration.

A stored 1949 Buick should be kept in a cool, dry, dark space away from direct sunlight, electric motors, welders, battery chargers, and other ozone sources that accelerate rubber aging. Clean floors, stable temperatures, and proper inflation help the tires keep their shape. Because every listed 1949 Buick fitment here is bias-ply, long static storage can make flat-spotting more noticeable than many owners expect.

For a collector Buick that sits for long periods, it helps to move the car periodically so the same footprint is not loaded in one spot for months at a time. Some owners also use stands or cradles during extended storage, provided the suspension is supported appropriately. A simple storage routine does as much for preserving ride quality and sidewall appearance as any cosmetic tire dressing.

Tire life on a 1949 Buick should be judged more by age and condition than by miles traveled. Collector-car tires often look good long after they have aged internally, so a practical rule is to evaluate them closely once they reach the five- to seven-year range and to treat about ten years as a point where replacement deserves serious consideration. The DOT date code on the tire helps establish age.

That timeline is especially important on a Buick that sees occasional drives, local shows, and long periods in the garage. Low mileage does not stop rubber from hardening or sidewalls from developing cracks. If the car has older tires of unknown age, checking the date code is one of the quickest ways to decide whether they are still suitable for regular road use.

Tires on a 1949 Buick should be inspected before every drive, and again more carefully before any longer outing. Look for sidewall cracking, cuts, bulges, tread irregularities, signs of impact damage, and slow pressure loss. On a collector car, it is also wise to inspect valve stems and the spare, since all of them may be aging at the same pace even if the car is driven infrequently.

Short local trips can hide problems that become serious at sustained road speeds. A few minutes in the garage checking pressure, sidewall condition, and tread surface can prevent damage to a restored car and save you from roadside trouble. If the Buick has been parked for a season, give each tire a closer look rather than relying on how it looked the last time the car was used.

The 1949 Buick 40 Special uses 650-16 sizing, and for an American passenger car of that period the original construction type would have been bias-ply rather than radial. That aligns with the current fitment path for the model, which remains in a bias-ply format on 16-inch rims. Original-equipment brand varied by production practice and market, so size and construction are the first authenticity checkpoints.

For restoration work, that means getting the Special into the right size family matters more than chasing a brand name unless you have strong period evidence for your specific car. Sidewall style also influences the finished look, especially if the Buick is being judged or photographed in a period presentation. Buick club resources and factory literature are the best next references for body-style and market-specific confirmation.

Correct tire fitment absolutely matters when showing a 1949 Buick. Judges and knowledgeable enthusiasts often notice whether the car has the right size, the proper bias-ply construction for the era, and a sidewall style that fits the car's intended restoration standard. A mismatch such as the wrong wheel diameter, the wrong model-specific size, or an obviously off-era sidewall treatment can distract from an otherwise excellent restoration.

That does not mean every event uses identical judging standards, but tire choice is one of the easiest visual details to get either right or wrong. A Special, Super, and Roadmaster should not all be treated the same in fitment terms for 1949. Before a serious show, compare your tire choice against period photos, marque references, and the event's own judging guidance.

For the 1949 Buick Roadmaster in 820-15, BFGoodrich and US Royal both stay within the correct bias-ply size family, but they differ in listed sidewall presentation and weight. The BFGoodrich offerings include blackwall and narrow whitewall versions, while the US Royal example shown is a 3.50-inch whitewall. Both brands list a maximum load capacity of 1920 pounds at 32 psi on the products carrying full specifications, and the US Royal example is shown at 29 pounds compared with 28 pounds for the BFGoodrich blackwall example.

For a restoration, that means the visible whitewall treatment may matter just as much as the brand name itself. A Roadmaster often benefits visually from a broad, upscale sidewall look, but the exact choice should reflect the presentation standard you are aiming for. If your goal is judged authenticity, compare the tire's whitewall width and overall look against Buick references from the same period before deciding.

The available 1949 Buick tires shown here are bias-ply products, and no explicit speed ratings are listed in the size descriptions provided for these fitments. A properly sized, correctly mounted, and well-maintained bias-ply tire can be used for normal road driving within the capabilities of the vehicle, but the car's own brakes, steering, suspension, and overall mechanical condition are just as important on a late-1940s Buick as the tire itself.

Highway use should be approached with the whole vehicle in mind rather than treating tire choice as the only safety question. A restored Roadmaster, Super, or Special may cruise comfortably at moderate speeds, but age, alignment, and storage history all affect how secure the car feels on the road. Before longer trips, inspect the tires carefully and make sure the rest of the chassis is equally ready.

Several 1949 Buick tire sizes carry listed load-and-pressure figures on specific products, but those figures are not interchangeable across the lineup. The 650-16 tires shown include examples rated at 1580 pounds at 32 psi, the 760-15 examples include 1710 pounds at 32 psi, and the 820-15 examples include 1920 pounds at 32 psi. Those numbers describe a tire's rated load capacity at a stated pressure, not automatically the factory inflation target for every Buick application.

For actual running pressure, start with the original Buick owner's literature or period service information for your exact model, then compare that against the reproduction tire manufacturer's guidance for the specific tire you choose. Do not borrow a pressure figure from a different size just because it is also a 1949 Buick tire. The Special, Super, and Roadmaster are separate fitment cases.

Before a longer drive in a 1949 Buick, inspect all five tires for cracking, cuts, bulges, tread wear, and signs of impact damage, then confirm pressures when the tires are cold. Check valve stems closely and make sure the spare is serviceable, not just present. On an older Buick, that tire inspection should be part of a larger pre-drive look at wheel hardware, steering response, braking feel, fluid levels, and basic lighting.

A collector car can seem fine on short local trips yet reveal weak spots when it is driven longer and farther from home. The better the Buick looks cosmetically, the easier it is to overlook age-related tire issues hiding in plain sight. A careful pre-drive routine protects the car, the occupants, and the restoration investment without turning every outing into a guessing game.