670-15 Tire Size Guide

The 670-15 code is a numeric bias-ply size. In this format, 6.70 refers to the nominal section width in inches, and 15 refers to the wheel diameter in inches the tire is built to fit.

Unlike a modern P-metric size, the 670-15 does not directly spell out an aspect ratio, service description, or a detailed metric width in the code itself. Buyers use this format mainly to match the original size family, preserve correct vintage proportions, and confirm that the tire still suits the wheel diameter and intended use of the vehicle.

The 670-15 fits a 15.0-inch wheel, which is 381.0 millimeters in diameter. That wheel diameter must match exactly, because a tire built for a 15-inch rim cannot safely mount to a different bead-seat diameter.

Wheel width matters as well. In this size, products span rim widths from 4.00 to 6.00 inches, so the actual wheel on the car should be checked before ordering. A narrow wheel can pinch the tire into a taller profile, while a wider wheel can flatten the sidewall shape and change clearance, appearance, and steering feel.

The 670-15 is 6.7 inches wide in section width, which converts to about 170.2 millimeters. Section width is measured at the widest point of the inflated casing from sidewall to sidewall, not across the tread face.

Clearance questions should be based on section width rather than tread width, because the sidewall bulge is usually what gets closest to fender lips, suspension parts, and steering components. On an older car, wheel width and alignment can also influence how much real-world space the tire needs once it is mounted and carrying load.

Yes. The 670-15 and 6.70-15 are two common ways of writing the same numeric tire size. Other variations such as 67015, 670 15, 670X15, and 6.70X15 are also alternate notations for the same basic size family.

The main thing to watch is not the punctuation, but the actual construction, wheel diameter, and application details on the sidewall. Vintage sizing is often written in several catalog styles, so buyers should treat the dash, decimal point, or X separator as naming variations rather than evidence that the tire is automatically a different fitment.

The 670-15 is commonly a tube-type fitment and is often set up with a tube. Tube use is still a wheel-and-tire-system question rather than a size question, so the final decision should be confirmed against the actual tire and wheel being used.

Many vintage wheels and tire designs were originally used in tube-type service, but a buyer should not assume every 15-inch wheel is prepared the same way. Rim design, tire construction, and manufacturer guidance all matter. When restoring an older car, it is wise to inspect the wheel condition closely and confirm the correct tube and flap practice before installation.

Most passenger-car versions of the 670-15 weigh between 21 and 26 pounds, while the Military & Truck version weighs 27 pounds. Weight can vary even within the same size because casing design and intended service are not always identical.

Tire weight affects more than shipping or handling. A heavier casing adds unsprung weight, which can subtly influence ride quality, steering effort, and the way an older suspension responds over rough pavement. For restorations, the bigger consideration is usually choosing the construction and load rating that suit the vehicle rather than chasing the lightest tire in the size.

The 670-15 is commonly associated with classic passenger cars, and it appears across late 1940s through mid 1970s applications that include sedans, wagons, sports cars, and some utility-based vehicles. It was not limited to one single body style or one manufacturer.

Fitment still depends on the actual wheel, body clearance, and how the vehicle was equipped when new. A car may have changed wheels, brakes, springs, or ride height over the years, and those changes can matter as much as the original size callout. Treat the size as a starting point, then verify wheel diameter, wheel width, and available space at full steering lock and suspension travel.

Start by confirming that the wheel is 15 inches in diameter and falls within the 4.00 to 6.00 inch width range used by tires in this size. Both dimensions matter because a correct diameter alone does not guarantee the tire will sit and profile properly on the wheel.

Wheel condition matters just as much on vintage vehicles. Older rims may have rust, damage at the bead seat, or previous repairs that affect how the tire mounts and seals. Before using the 670-15, inspect the wheel carefully, confirm that the rim style matches the intended tire setup, and compare mounted clearance against suspension, steering, and body components.

The 670-15 is strongly tied to the bias-ply era and is often the right direction when a vehicle is being restored to an authentic factory-style look. Bias-ply construction usually preserves the tall profile, sidewall shape, and visual stance expected on many antique and classic passenger cars.

Originality is still more specific than size alone. Sidewall treatment, load rating, wheel width, and the exact application year can all affect whether a restored car looks and drives the way its owner intends. Buyers working toward judged authenticity should compare the tire not only to the size called for, but also to the trim level, wheel design, and period appearance of the vehicle.

A 670-15 bias-ply tire typically delivers the road feel vintage cars were designed around, with a compliant sidewall and a more traditional steering response than most modern radials. Drivers often notice that the tire contributes to the original character of the car rather than masking it.

Ride and handling impressions depend on more than construction alone. Suspension wear, alignment settings, wheel width, vehicle weight, and tire age can all change how the car tracks and reacts on modern pavement. On a well-sorted classic, the 670-15 helps preserve the period experience, but it should still be chosen with realistic expectations about how an older chassis behaves.

Moving from the 670-15 to a radial comparison size such as 195R15, P205/75R15, P215/70R15, or 670R15 can change how the vehicle feels and sits, even when the sizes are considered close matches. Steering response, wheel-opening fill, and ride character may all shift depending on the substitute chosen.

A 75-series option usually stays closer to the original overall look than a lower-profile 70-series size, while a bias-look radial may help preserve vintage appearance with different road manners. Before substituting, compare the new tire’s diameter, width, and wheel fit against the original setup so stance, clearance, and speedometer behavior do not change more than you expect.

The 670-15 can be used on today’s roads when the tire is in sound condition and matched properly to the vehicle, wheel, and load requirements. Driving expectations should remain appropriate to a vintage bias-ply design and to the mechanical condition of the vehicle itself.

Modern pavement, traffic speeds, and braking demands can expose weaknesses in an older chassis long before the tire size becomes the only issue. Buyers should inspect suspension, steering, and alignment carefully, keep the tires properly maintained, and confirm that the selected version of the 670-15 matches the vehicle’s real load needs rather than relying on size alone.

The 670-15 is available from Avon, BFGoodrich, Coker Classic, Excelsior, Firestone, Goodyear, STA, US Royal, and Universal Vintage Tire. That gives buyers a mix of classic-name reproductions, specialty vintage offerings, and heavier-duty versions within the same size family.

Brand choice should be guided by the car’s use and the look you want to preserve. Some owners prioritize an original-style blackwall or whitewall presentation, while others focus first on load rating or a utility-oriented casing. The most important thing is to choose a full set that matches in construction, sidewall appearance, and service intent.

A quality 670-15 should match the correct bias-ply construction, the proper 15-inch wheel diameter, and the load rating needed for the vehicle. It should also have a casing and sidewall style that suit the car’s intended appearance, whether that means blackwall, narrow whitewall, or a wider whitewall treatment.

Consistency matters as much as any single feature. Mixing different visual treatments or service types across the same vehicle can spoil both appearance and behavior, especially on a restoration. Buyers should compare wheel-width compatibility, load markings, and the sidewall details of each tire so the finished set works together as a complete package.

Yes. The 670-15 appears in blackwall, narrow whitewall, and wide whitewall versions, and that choice has a major effect on how a vintage car presents itself. On many restorations, the sidewall treatment is nearly as important visually as the size itself.

Factory-era appearance was not one-size-fits-all, so the right sidewall style depends on the vehicle’s year, trim level, and the look the owner is trying to achieve. A blackwall can suit a plain or performance-minded presentation, while whitewall widths can change the visual balance of the wheel opening. Matching all four tires is usually the cleanest way to keep the car visually coherent.

Inspect the 670-15 regularly for cracking, cuts, bulges, impact damage, uneven wear, and slow air loss. On an older vehicle, it is also smart to look closely at the bead area, valve stem, and the wheel itself because vintage rims and tube-type service can add variables modern drivers may not think about.

Bias-ply tires can show their age even when tread depth still looks acceptable. Time, heat, sunlight, and long periods of sitting all affect the casing, so inspection should focus on condition as much as mileage. Before any long drive, check the full set cold and pay attention to how the car feels once underway.

Low mileage does not guarantee long service life for the 670-15. A collector car tire can age out from time and storage conditions even when the tread still looks good, because rubber and internal materials continue to change whether the car is driven often or not.

Storage plays a large role in how well an older bias-ply tire holds up. Keep the vehicle away from direct sunlight, excess heat, moisture, and ozone sources such as electric motors or battery chargers. Periodic inspection remains essential, and any signs of cracking, distortion, or persistent air loss should be taken seriously before road use.

Because the 670-15 is commonly used in a tube-type setup, tube condition should be treated as part of the tire system rather than as a separate afterthought. The tire, tube, valve stem, and wheel all need to work together, especially on older rims that may have seen decades of use.

Whenever tires are changed, the wheel should be inspected for rust, roughness, or damage that could affect the tube or bead area. A car that develops unexplained air loss or vibration deserves a closer look at the complete assembly. Matching the tire to the wheel correctly is just as important as maintaining the casing itself.

The 670-15 should be replaced when it shows cracking, bulges, separations, repeated air loss, impact damage, or wear severe enough to affect road use. Tread depth alone is not the only measure, especially on a vintage bias-ply tire that may have spent long periods parked or stored.

Age and condition deserve as much attention as mileage. Collector vehicles often accumulate years faster than miles, and rubber can deteriorate from sunlight, heat, ozone, and inactivity. Before trusting an older set for regular driving or a longer trip, inspect the tires closely and have any questionable casing evaluated by a qualified tire professional.

Most passenger versions of the 670-15 are rated from 1,450 pounds at 32 psi to 1,550 pounds at 32 psi, while the Military & Truck version is rated at 1,530 pounds at 45 psi. Those figures should be checked against the actual vehicle weight and intended service before installation.

Load capacity only has meaning at its stated inflation pressure, so the exact pairing matters. A buyer should not assume every 670-15 in the size carries the same rating simply because the dimensions match. Vehicles with added cargo, passengers, or utility use deserve extra attention to the tire’s service category as well as its basic size.

Road use with the 670-15 starts with confirming wheel compatibility, tire condition, and the intended tube setup. Vintage tires and wheels require a system view, and buyers should also review the sidewall markings of the exact tire being used, especially when products in this size show different service markings.

Before highway or trip use, inspect the tires cold, confirm that the wheels are sound, and make sure the selected tire matches the vehicle’s load needs and the way the car will actually be driven. Local requirements can vary, so current markings and road-use expectations should be reviewed rather than assumed from size alone.