1950 Buick 70 Roadmaster Tires

The 1950 Buick 70 Roadmaster uses an 800-15 tire size. This is a vintage numeric bias-ply fitment used on a 15-inch wheel, giving the car the tall, substantial tire profile expected on a large postwar Buick.

That makes size selection fairly simple, but it does not end the decision. The next step is choosing the right tire within the 800-15 size, including whitewall appearance and whether to stay with bias-ply construction or consider a radial equivalent after confirming wheel width, overall dimensions, and clearance.

The primary tire fitment for the 1950 Buick 70 Roadmaster is built around a 15-inch rim. The 800-15 sizing format ends with the wheel diameter, and the available bias-ply products in this application also use a 15-inch rim diameter.

Rim diameter is the first check before ordering any replacement tire. It is also worth confirming actual wheel width on the car, especially if the Roadmaster has had wheels changed over the years, because radial equivalents and product selections can have different rim-width expectations than a traditional bias-ply tire.

Yes. The covered 1950 Buick 70 Roadmaster 8 Cyl. uses the same 800-15 bias-ply tire size. That keeps fitment consistent within this application and avoids the confusion that can come with different trim-specific tire sizes.

Even with shared sizing, the best tire choice still depends on how the car is being finished and driven. A restoration-minded owner may focus on whitewall presentation and traditional construction, while someone considering a radial alternative should still verify wheel width, tire dimensions, and available clearance before changing from the original-style format.

For the 1950 Buick 70 Roadmaster, 800-15 is the primary bias-ply tire size. That construction matches the traditional sizing system and overall look associated with large American cars of this period.

Choosing to stay with bias-ply keeps the original-style tire format and appearance in place. Owners thinking about a radial alternative should treat that as a separate fitment decision, since changing construction can affect wheel-width suitability, tire profile, and the way the car presents visually on the road.

Radial equivalents for 800-15 include 225R15, P235/75R15, P235/70R15, and 800R15. Those cover an 80-series metric radial, a 75-series P-metric radial, a 70-series P-metric radial, and a bias-look radial that keeps a more traditional appearance.

Each of those sizes should be evaluated as an alternative rather than assumed to interchange automatically. A 6-8 inch rim-width range is associated with the equivalent group, and a careful check of wheel width, overall tire dimensions, fender clearance, and steering clearance is worthwhile before converting the Roadmaster to radials.

Yes, 800R15 is available as a bias-look radial equivalent for the 1950 Buick 70 Roadmaster's 800-15 primary tire size. It is intended for owners who want a radial option while preserving more of the visual character associated with a vintage tire.

That makes it a useful middle ground between traditional bias-ply appearance and a modern radial construction. Even so, the Roadmaster's wheels and clearances still need to be checked carefully, because a bias-look radial is an equivalent choice, not an automatic one-size-fits-all substitute for every wheel and chassis setup.

Start with the confirmed 800-15 size and the 15-inch wheel requirement. From there, the main considerations are whether to keep a traditional bias-ply construction, which whitewall presentation suits the car best, and whether the tire's rim-width specification matches the wheels actually on the Roadmaster.

Available 800-15 products in this application share the same basic size, so the real differences are visual and fitment-related rather than a change in nominal size. A buyer should compare sidewall treatment, construction type, load specification, and wheel compatibility against the car's restoration goals and intended road use.

The available 800-15 products for the 1950 Buick 70 Roadmaster use wide whitewall styling. Within that presentation, the visible choice is between a 2.50-inch whitewall and a 3.00-inch whitewall, both within the Coker Classic Bias Ply line.

That difference matters because whitewall width has a strong effect on how a full-size 1950 Buick looks at the curb. Owners usually choose based on the visual balance they want between the body, wheel opening, and hubcap area, while keeping the tire size and period-style character consistent.

The available 800-15 products for this application are offered in the Coker Classic Bias Ply series. That keeps the selection focused on a traditional bias-ply presentation rather than splitting choices across several unrelated series with different visual themes.

With a single series in view, product comparison becomes more about the whitewall treatment and fitment details than broad changes in design family. It is still smart to compare the tire's load specification, 15-inch rim compatibility, and wheel-width suitability to the actual wheels mounted on the Roadmaster.

A period-style starting point for a 1950 Buick 70 Roadmaster is the 800-15 bias-ply fitment. That size and construction preserve the traditional tire profile associated with a large 1950 Buick and keep the car visually aligned with its postwar American luxury character.

From there, the decision usually comes down to how the finished car should present, especially in whitewall width and whether traditional bias-ply construction remains part of the goal. When exact originality matters, marque-specific references and restoration documentation are the right next step before settling on a final tire appearance.

Tire construction can change how a restored 1950 Buick 70 Roadmaster looks, even when the wheel diameter stays the same. An 800-15 bias-ply keeps the traditional vintage format, while a radial equivalent may alter the visual impression depending on its profile and sidewall treatment.

That is why many restoration-minded owners begin with the original-style size and then decide how much modern substitution they want to accept. A bias-look radial can help preserve a more traditional presentation, but wheel fit, proportions, and clearance should still be reviewed before changing away from the bias-ply format.

Yes. Modifications can affect tire fitment on a 1950 Buick 70 Roadmaster even when the nominal size remains close to stock. Changes such as aftermarket wheels, altered wheel width, suspension work, or body modifications can all influence how an 800-15 tire or radial equivalent sits in the wheel opening.

That matters most when the car no longer retains its original wheel setup. A careful check of actual rim diameter, wheel width, steering clearance, and fender clearance helps prevent ordering a tire that matches the vintage size on paper but does not suit the Roadmaster's current configuration.

Before driving a 1950 Buick 70 Roadmaster on new tires, inspect the wheels for correct diameter and condition, verify valve-stem condition, and confirm that each tire is properly seated and inflated. It is also wise to look over suspension and steering components on a large collector car before regular road use.

A short, cautious test drive can reveal rubbing, pull, vibration, or clearance issues that are easier to address early. After the first miles, recheck pressure and give the tires another visual inspection so the Roadmaster is not being asked to carry its weight on an installation problem that could have been caught quickly.

800-15 tires on a collector 1950 Buick 70 Roadmaster should be kept properly inflated, inspected regularly for cracking, bulges, cuts, and irregular wear, and protected from long exposure to heat, sunlight, and ozone sources during storage. Low-use collector cars especially benefit from routine visual checks rather than occasional attention.

Maintenance also means watching for slow air loss and looking at the tires before every meaningful drive, not just during annual service. Because a Roadmaster is a substantial car, even a small condition issue deserves attention early, especially if the car has been sitting or is preparing for a longer road outing.