1964 Triumph Sports Six Tires

The 1964 Triumph Sports Six uses two tire sizes: 560-13 in bias-ply construction and 155R13 in radial construction. Both are 13-inch fitments, but they represent different tire-sizing systems and different construction types rather than two unrelated wheel diameters.

The practical choice is deciding which setup matches the car as it sits today. A Sports Six kept in a traditional bias-ply configuration may stay with 560-13, while a car using a radial setup may use 155R13. Wheel width, overall tire dimensions, and clearance should still be checked before changing from one construction path to the other.

Both primary tire sizes for the 1964 Triumph Sports Six are built around a 13-inch rim diameter. That applies to the 560-13 bias-ply fitment and the 155R13 radial fitment, so wheel diameter remains consistent even though the sizing formats are different.

Rim diameter is only the first checkpoint. Product fitment can also depend on wheel width, which varies across the available tires, so it helps to confirm the actual wheel on the car before selecting a tire. That matters even more if the Sports Six has replacement wheels or has already been converted from one tire construction to another.

560-13 is a numeric bias-ply tire size. The 560 portion refers to a nominal section width of about 5.60 inches, and the 13 identifies the wheel diameter in inches. On the 1964 Triumph Sports Six, it is the bias-ply fitment rather than the radial one.

This matters because 560-13 is tied to traditional bias-ply construction and a distinctly vintage tire presentation. Buyers looking at this size should focus on sidewall style, tire series, and wheel compatibility instead of assuming that any modern 13-inch tire will behave the same way. A radial alternative can be considered, but it should be evaluated as an equivalent, not as the same tire size.

560-13 is a bias-ply tire size for the 1964 Triumph Sports Six. The radial fitment on this model is 155R13, so the two sizes separate the car's traditional numeric bias-ply path from its metric-style radial path.

That distinction affects both appearance and setup. A 560-13 choice keeps the car in a vintage bias-ply format, while a 155R13 moves it into radial construction on the same 13-inch rim diameter. Before changing between them, confirm wheel width, compare the tire's physical dimensions, and make sure steering and body clearance remain appropriate for the car's current configuration.

Radial equivalents for 560-13 include 155R13 as the 80-series metric radial, P155/75R13 as the 75-series P-metric radial, and P155/70R13 as the 70-series P-metric radial. These are the recognized radial alternatives connected to the original numeric bias-ply size.

Each option uses a different sizing convention, so the choice is not simply about finding any 13-inch radial. The recommended rim-width range for the equivalent setup is 4 to 5 inches, and the actual wheel on the car should be checked before making the switch. Tire dimensions, suspension condition, and fender or steering clearance also deserve attention during any conversion.

The answer depends on how the 1964 Triumph Sports Six is being used and how closely the owner wants to stay with a traditional tire presentation. The car supports both a 560-13 bias-ply fitment and a 155R13 radial fitment, so either path can be relevant depending on the wheel and overall setup.

Bias-ply tires usually appeal to buyers focused on period-style construction and vintage appearance, while radial tires appeal to owners who want the car set up around a radial format. The important step is matching the tire to the actual wheel width and vehicle condition, then checking clearance carefully if the car has been modified or converted from its earlier tire arrangement.

Start with construction and presentation. On the 1964 Triumph Sports Six, 560-13 is the bias-ply size, so choosing within that size means comparing period-style tire series, sidewall appearance, and wheel compatibility rather than deciding between unrelated fitments.

Available 560-13 products include BFGoodrich and Firestone bias-ply tires, with narrow whitewall and wide whitewall options. Rim-width specifications differ across the products, so the wheel on the car should be measured before selecting one. Load figures and overall tire use also matter, especially if the car is driven regularly instead of displayed or used only for occasional local events.

Sidewall choice depends on which tire size and construction you want to run. In 560-13 bias-ply form, the 1964 Triumph Sports Six is available with narrow whitewall and wide whitewall styles, while the 155R13 radial choices are offered as blackwall tires.

That gives the car two very different visual directions. A whitewall bias-ply tire creates a stronger vintage presentation, while a blackwall radial keeps the look simpler and more restrained. Sidewall style should be chosen after the correct size and construction path are settled, since appearance alone should not outweigh wheel-width compatibility and the intended use of the car.

The 1964 Triumph Sports Six has tire options from Michelin, Dunlop, BFGoodrich, and Firestone. Michelin and Dunlop cover the 155R13 radial fitment, while BFGoodrich and Firestone cover the 560-13 bias-ply fitment.

Brand choice should be weighed alongside size, construction, tire series, and sidewall style. For example, a buyer comparing 155R13 products is really comparing blackwall radial offerings, while a buyer looking at 560-13 is choosing among bias-ply tires with different whitewall treatments and rim-width specifications. The strongest comparison is within the correct size rather than across the two different fitment paths.

For a period-style presentation, the 560-13 bias-ply fitment is the natural starting point on a 1964 Triumph Sports Six. It keeps the car in a vintage numeric bias-ply format and is available in classic bias-ply series from BFGoodrich and Firestone.

The finer decision comes down to sidewall treatment and wheel compatibility. Narrow whitewall and wide whitewall versions create different visual effects, so the right choice depends on the look being pursued. When exact originality matters, period photos, marque-club references, and restoration documentation can help narrow the appearance decision beyond simply selecting the correct size and construction.

Tire construction changes the visual character of a restored 1964 Triumph Sports Six more than many buyers expect. A 560-13 bias-ply tire gives the car a more traditional small-sports-car presentation, especially when paired with whitewall styling, while a 155R13 radial introduces a later-looking blackwall radial format.

That difference matters even before the car turns a wheel. Buyers aiming for a restoration-oriented appearance often begin with the bias-ply size, while owners more focused on a radial setup may accept a different visual impression. The best choice depends on the car's intended use and the owner's restoration priorities, not just on whether both sizes share the same 13-inch rim diameter.

Yes. Even though the 1964 Triumph Sports Six uses 13-inch tire fitments, modifications can still change what works safely on the car. Aftermarket wheels, wheel-width changes, suspension alterations, ride-height changes, or bodywork differences can all affect how either 560-13 or 155R13 fits in actual use.

That is especially important when moving between bias-ply and radial setups or when considering radial equivalents for the original bias-ply size. A car with changed wheels or suspension should be checked for steering clearance, fender clearance, and wheel width before tires are selected. Measuring the current setup usually prevents expensive mistakes and helps narrow the right tire path more quickly.

Before driving a 1964 Triumph Sports Six on new tires, inspect the wheels, lug hardware, valve stems, and overall wheel condition, then confirm that the tire size and construction match the car's current setup. It also helps to verify that the tires seat correctly and that inflation is set appropriately for the tire in use.

A broader mechanical walkaround is worthwhile on any vintage sports car. Check for suspension wear, steering looseness, brake issues, and anything that could create rubbing or uneven tire behavior once the car is on the road. After the first short drive, recheck pressure and look for any signs of contact, shifting, or air loss before taking the car farther.

Collector-car tires on a 1964 Triumph Sports Six should be maintained with regular pressure checks, routine visual inspections, and careful storage. Whether the car is running 560-13 bias-ply tires or 155R13 radials, look for cracking, bulges, cuts, irregular wear, or signs that the tire has been losing air while the car sits.

Low-use cars often age tires by time and storage conditions rather than mileage. Keeping the Sports Six away from prolonged sunlight, heat, moisture, and ozone sources helps preserve the tires, and moving the car occasionally can reduce flat spotting during long storage periods. Any tire showing age-related deterioration should be evaluated before road use, even if the tread still looks serviceable.