550-17 Tire Size Guide

The 550-17 is a numeric tire size. In this format, the 5.50 identifies the nominal section width in inches, while the 17 identifies the wheel diameter in inches. It is a bias-ply-era sizing convention commonly associated with vintage and specialty applications rather than modern passenger-car sizing.

Modern P-metric sizes usually include width in millimeters, an aspect ratio, construction type, and rim diameter all in one code. The 550-17 does not do that. It gives you the nominal width and wheel diameter, but it does not directly state a modern aspect ratio or load index in the size itself. Buyers restoring antique vehicles often prefer this format because it matches the proportions and appearance expected from the period.

The 550-17 fits a 17.0-inch wheel, which is 431.8 millimeters in diameter. That measurement is taken at the bead seat where the tire mounts to the rim, and it must match exactly for safe installation.

Wheel diameter is only one part of the fitment picture. Buyers should also inspect the wheel itself for condition, especially on older original rims, and confirm the tire's profile works with the vehicle's fenders, suspension, and brake hardware. Because this is a vintage size commonly used on older vehicles, wheel design, bead shape, and tube setup can matter just as much as the diameter number stamped into the size code.

The 550-17 has a section width of 5.5 inches, which is about 139.7 millimeters. Section width measures the tire at its widest point from sidewall to sidewall, not across the tread face that actually contacts the road.

That distinction matters during fitment checks. The sidewall is usually the first part of the tire to approach fender edges, steering arms, springs, or brake components, so section width is the more useful clearance number. On a narrow vintage tire like the 550-17, preserving the original visual proportions can be just as important as simple clearance, especially when the goal is an authentic prewar or early postwar stance.

Yes, 550-17 and 5.50-17 are common ways of writing the same basic size. Other notations such as 55017, 550 17, 550X17, and 5.50X17 also point buyers toward the same vintage numeric format built around a 5.50-inch nominal width and a 17-inch rim diameter.

Even when the written format changes, the important step is confirming the actual tire construction and intended application. Vintage numeric sizes often appear in several shorthand versions across old manuals, sidewall markings, and hobby references. When comparing options, make sure the tire still matches your wheel diameter, your vehicle's original size recommendation, and the look you want from a period-correct bias-ply setup.

The 550-17 is commonly a tube-type fitment. With vintage sizes like this, tube use is often part of the original-style wheel and tire system rather than a rule created by the size code alone.

Wheel design ultimately decides the answer. Original rims, older drop-center designs, and restoration-era wheel hardware may call for a tube even when a buyer is focused mainly on the tire size. Before mounting the 550-17, confirm the requirement against the actual wheel being used, inspect the rim for rust or damage, and follow the tire maker's guidance for tube, flap, and wheel compatibility.

The 550-17 weighs 18 pounds in the available versions of this size. That figure is the weight of one tire by itself, without the wheel, tube, or any mounting hardware.

Tire weight matters more than many restorers expect because it contributes to unsprung weight and influences how an early chassis feels over bumps. On a narrow bias-ply antique size, the number is also useful when comparing one style within the same size to another, such as blackwall versus whitewall versions. Keeping all four tires matched in construction and size is usually more important than chasing small weight differences on a restoration.

The 550-17 is associated mainly with prewar passenger cars and related vintage specialty applications, with documented use from 1931 through 1953. Examples in that span include makes such as Auburn, Chevrolet, Chrysler, Ford, Nash, Pontiac, Studebaker, and several others from the early American and postwar collector landscape.

Vehicle lists should be treated as a research starting point rather than a blanket fitment guarantee. Early cars often saw running changes, export variations, replacement wheels, and decades of modifications. A careful buyer should compare the actual wheel diameter, rim condition, body clearance, and original documentation before assuming the 550-17 is the right choice for a specific car.

Yes, the 550-17 is often a strong period-correct choice when the vehicle originally used a narrow 17-inch bias-ply size from the 1931 to 1953 era. Its numeric bias-ply format and proportions align with the look and driving character expected on many antique passenger cars.

Authenticity still depends on more than the sidewall code alone. Restorers should compare the size against factory manuals, surviving original tires if available, wheel style, and overall stance. A tire can be historically appropriate in format yet still look wrong if the width, sidewall profile, or wheel setup differs from what the vehicle carried when new.

Start with the basics: the 550-17 requires a 17-inch wheel, has a nominal section width of 5.5 inches, and is commonly set up with a tube. Those three points make it important to confirm wheel diameter, wheel condition, and the complete tire-and-rim system before moving ahead.

Clearance checks should include fender space, steering lock, suspension travel, and brake hardware, especially on vehicles that have been restored over many decades. Older wheels can also vary in bead design and structural condition. If the car no longer carries its original rims, compare the current wheel setup against both the tire's requirements and the vehicle's original specifications before mounting the 550-17.

The 550-17 uses bias-ply construction, so its road feel is usually more in line with antique vehicle behavior than with modern radial response. Drivers often choose this type of tire to preserve the steering character, sidewall shape, and overall period feel that suit a prewar or early postwar chassis.

Ride and handling will depend heavily on suspension condition, steering play, alignment, wheel trueness, and the age of the tire itself. An older car on fresh bias-ply tires can still feel very different from the same car on later radial conversions. Buyers should approach the 550-17 as an authenticity-first size rather than expecting modern precision or braking behavior from the construction alone.

The 550-17 can be used on today's roads when the vehicle, wheel system, and tire condition are all properly sorted, but it should be approached as a vintage bias-ply fitment rather than a modern everyday tire format. Its behavior will reflect early construction methods and the limitations of the vehicle it is mounted on.

Modern traffic speeds, road surfaces, and braking expectations can expose weaknesses in old suspensions, worn steering parts, and aged wheels long before the tire size itself becomes the only issue. Buyers should inspect the whole chassis, confirm the tire's current sidewall markings, and make sure the vehicle's load demands and intended road use are realistic for a narrow antique bias-ply setup.

The 550-17 contributes to the tall, narrow appearance typical of many 1930s and early 1950s vehicles. Its 5.5-inch nominal width helps preserve the upright visual balance, slimmer tire profile, and wheel opening character that many antique restorations lose when later, wider sizes are substituted.

Appearance is more than cosmetic on collector cars because stance also influences steering clearance and how the tire sits within the fender. A wider or shorter replacement may change the car's posture even if it clears mechanically. For restorers chasing original proportions, the 550-17 often matters as much for silhouette and profile as it does for simple wheel fitment.

BFGoodrich is available in the 550-17 size. In the current range for this size, the available options share bias-ply construction and 17-inch fitment while offering different sidewall appearances for different restoration preferences.

Brand selection in an antique size should still be approached carefully, even when the list is short. Buyers should look at construction consistency, sidewall style, intended use, and whether they want the same tire across all four corners. Matching the full set in size, construction, and appearance usually matters more on a collector vehicle than mixing tires to chase small visual differences.

A quality 550-17 tire should first match the vehicle's intended use and restoration goal. Because this is a vintage numeric bias-ply size, the most important factors are correct construction type, accurate 17-inch fitment, dependable casing quality, and proportions that preserve the vehicle's original look.

Sidewall appearance also matters in this category because blackwall, whitewall, and double-whitewall choices can change the car's visual era and trim level impression. Many buyers focus on tread alone, but antique fitment decisions are broader than that. Construction consistency across the set, compatibility with the wheel system, and the right period appearance are usually better quality indicators than any single styling detail.

Yes, most buyers are best served by keeping all four 550-17 tires matched in construction, size, and sidewall style. In this size, the available options include blackwall, wide whitewall, and double-whitewall versions, but they all remain within the same vintage bias-ply category.

Mixing sidewall styles can make a restored vehicle look unfinished, and mixing tire constructions can change road feel from one axle to the other. On an antique chassis, uniformity helps preserve predictable handling and a balanced appearance. If originality matters, compare period photos, trim level details, and factory literature before choosing which sidewall treatment best suits the car.

The 550-17 should be stored the same way any collector tire should be stored: clean, dry, and away from heat, direct sunlight, electric motors, and other ozone sources. Even when tread looks excellent, time and storage conditions can age a bias-ply tire long before it appears worn out.

Seasonal-use vehicles benefit from regular inspection during storage, not just before driving season. Check for sidewall cracking, flat spotting, air loss, and any signs of wheel corrosion that could affect a tube-type setup. If the vehicle sits for long periods, moving it occasionally and maintaining proper inflation can help reduce stress on the casing.

The 550-17 should be inspected regularly for cracking, cuts, bulges, air loss, uneven wear, and damage around the bead area. On antique vehicles, inspections matter before every longer drive because the tire is only one part of an older wheel and suspension system.

Bias-ply collector tires often cover low annual mileage, but age can still affect them. A fresh-looking tread surface does not cancel out years of heat cycles, storage exposure, or old wheel issues. Make inspection part of routine ownership by checking both the tire and the rim, especially if the car has sat for weeks or months between drives.

The 550-17 is often set up with a tube, but the final answer depends on the actual wheel and tire being used together. Tube use is a wheel-and-tire-system question, not something the size code settles by itself in every case.

Original rims, restored steel wheels, and replacement wheels can differ in bead profile and sealing condition, so the same size may be handled differently on different vehicles. Confirm the correct setup before mounting by checking the tire's current sidewall markings, the wheel's design and condition, and the manufacturer's guidance for the combination you plan to run.

The 550-17 should be replaced when age, cracking, bulges, repeated air loss, impact damage, or other condition issues raise doubt about continued service, even if tread depth still looks usable. Collector tires often age out before they wear out, especially on cars that spend long periods parked.

A careful pre-drive inspection is especially important with antique bias-ply fitments because the wheel, tube setup, and chassis condition all affect roadworthiness. Buyers should review the tire's date and current sidewall markings, inspect the rim as closely as the casing, and consult a qualified tire professional whenever condition or serviceability is uncertain.

The most important checks before driving on the 550-17 are tire condition, wheel condition, inflation status, and the integrity of the full mounting system. Because this size is commonly a tube-type fitment on older vehicles, bead area condition and rim integrity deserve as much attention as the tread itself.

Longer drives call for a more thorough look at the chassis as well. Inspect for sidewall cracking, visible cord damage, loose steering parts, brake issues, and anything that could upset an antique vehicle at speed. Safe use depends on the whole vehicle being properly prepared, not just on the tire size matching the wheel diameter.

Street use depends on the specific tire's current markings, condition, and the requirements that apply where the vehicle is registered and driven. The 550-17 is a vintage size, so buyers should review the actual tire and local rules rather than assuming every example in the size is automatically acceptable for every road situation.

Legal compliance is only one part of the decision. Buyers should also confirm that the tire's construction, age, wheel compatibility, and intended road use make sense for the vehicle. On antique cars, a size can be historically correct and still require careful judgment about route choice, trip length, speed expectations, and overall vehicle preparedness.