1966 Triumph Sports Six Tires

The 1966 Triumph Sports Six uses two recognized tire sizes: 560-13 in bias-ply construction and 155R13 in radial construction. Both are 13-inch fitments, so the main distinction is not wheel diameter but tire type and sizing convention.

That makes the next step fairly clear. A buyer should first decide whether the car is staying with a traditional bias-ply presentation or moving to a radial setup, then confirm the actual wheel dimensions on the car before choosing among the available products, sidewall styles, and brands.

The applicable tire sizes for a 1966 Triumph Sports Six are built around a 13-inch rim diameter. Both the 560-13 bias-ply size and the 155R13 radial size share that same wheel diameter, which keeps the fitment decision focused on construction and product choice rather than a different rim size.

Rim diameter is only part of the picture, though. Before changing from one tire type to another, it is smart to confirm actual wheel width as well, because the available products do not all share the same rim-width range and an older sports car may no longer be wearing its original wheels.

Yes. The 1966 Triumph Sports Six Base uses the same two fitment paths found on this page: 560-13 as a bias-ply choice and 155R13 as a radial choice. Both options remain centered on a 13-inch rim diameter.

That consistency helps simplify shopping, but it does not remove the need to inspect the car itself. A Sports Six Base with replacement wheels, suspension changes, or a long-restored setup should still have its actual wheel width and tire clearance checked before switching constructions or moving from bias-ply to radial.

On the 1966 Triumph Sports Six, 560-13 is a bias-ply tire size. It uses the older numeric sizing system and represents the traditional construction choice for this car, while 155R13 is the radial fitment path in a Euro-metric format.

That difference matters because the tire’s look and driving feel can change with construction. Staying with 560-13 keeps the car in a period-style bias-ply format, while moving to a radial means confirming wheel width, overall suitability, and clearance before assuming the car’s current setup is ready for the change.

Radial equivalents for 560-13 include 155R13 as an 80-series metric radial, P155/75R13 as a 75-series P-metric radial, and P155/70R13 as a 70-series P-metric radial. These are alternative radial sizing formats related to the original 560-13 fitment rather than additional primary factory-style sizes.

Each equivalent should be treated as a fitment option that still needs to be checked on the car. A recommended rim-width range of 4 to 5 inches applies to the radial-equivalent path, and wheel width, tire clearance, and the vehicle’s actual wheel setup should all be verified before conversion.

The right choice depends on what matters most for the car. A 560-13 bias-ply keeps the Triumph Sports Six in a traditional period-style construction, while 155R13 gives it a radial fitment path in a 13-inch size that suits buyers looking for a more modern tire format.

Appearance, driving expectations, and wheel specifications should guide the decision. A restoration-oriented owner may prefer the traditional look of the bias-ply setup, while a road-use owner may focus on the radial option, but either path still deserves a careful check of wheel width and available space around the tire.

Start with the car’s intended direction: 560-13 bias-ply for a traditional vintage presentation or 155R13 radial for a more modern construction in the same 13-inch rim diameter. After that, compare brand, tire series, sidewall style, rim-width specification, and any load details shown for the specific product.

A sports car this small can be sensitive to wheel changes and visual proportion, so appearance matters alongside fitment. Narrow whitewall, wide whitewall, and blackwall choices create very different looks, and a car with replacement wheels should have its actual rim width checked before a final tire decision is made.

The available sidewall styles for the 1966 Triumph Sports Six include blackwall in 155R13 radial form, plus narrow whitewall and wide whitewall choices in 560-13 bias-ply form. Those sidewall differences are not just cosmetic details; they often go hand in hand with different tire constructions and product families.

A blackwall radial usually suits an understated sports-car look, while the whitewall bias-ply options create a more overt vintage presentation. The best choice depends on how the car is being finished and driven, so it helps to decide on the overall character first and then compare the products within that size and construction.

Michelin and Dunlop offer 155R13 radial choices for the 1966 Triumph Sports Six, while BFGoodrich and Firestone offer 560-13 bias-ply options. Those brands span both of the car’s primary fitment paths, giving buyers a real choice between construction types as well as between different tire lines.

Brand should be considered alongside the rest of the specification, not by itself. One product may differ from another in sidewall treatment, rim-width range, load figure, or tire series, so the smarter comparison is between complete tire configurations that match the car’s wheel setup and intended appearance.

For a period-style 1966 Triumph Sports Six, the 560-13 bias-ply size is the natural starting point because it keeps the car in a vintage numeric size and traditional construction. BFGoodrich and Firestone choices in that size also allow the look to be shaped further through narrow whitewall or wide whitewall treatments.

A restoration-oriented decision usually balances appearance with how the car will actually be used. If exact originality matters beyond general period style, marque-specific references and historical vehicle documentation are worth consulting, while a road-driven car may still lead its owner toward the radial fitment path instead.

Construction changes the visual character of the car almost immediately. A 560-13 bias-ply gives the 1966 Triumph Sports Six a more traditional small-sports-car presentation, especially with whitewall options, while a 155R13 radial in blackwall form creates a more modern and understated look.

That visual shift is one reason construction choice matters in restoration planning. Buyers trying to preserve a vintage feel often stay closer to the bias-ply path, while those prioritizing regular road use may accept the different look of a radial, provided the wheel width and overall fitment are confirmed first.

Yes. Modifications can change how either 560-13 bias-ply tires or 155R13 radials fit on a 1966 Triumph Sports Six, even though both use a 13-inch rim diameter. Aftermarket wheels, altered wheel width, suspension work, or body changes can all influence clearance and tire suitability.

A car that has been lowered, widened, or fitted with replacement wheels should be measured rather than assumed correct. Checking wheel width, steering clearance, and space at the fender openings is especially important before switching constructions, since an older British sports car may have evolved far from its earlier setup.

Before driving a 1966 Triumph Sports Six on new tires, inspect the wheels for correct diameter and width, verify that the tires are seated properly, and check for adequate clearance at the suspension, steering, and body. Tire pressure should be set appropriately, and the car should be looked over for any obvious alignment or wear issues.

A short, careful road test is a smart follow-up after installation. Listen for rubbing, watch for unusual steering behavior, and recheck pressure after the first drive, especially on a collector car that may sit for long periods or have older suspension parts that can influence how the new tires behave.

Tires on a collector 1966 Triumph Sports Six should be inspected regularly for cracking, bulges, cuts, tread wear, and slow air loss, even if the car is driven only occasionally. Low-mileage classics can age their tires through time and storage conditions just as much as through road use.

Proper inflation and storage make a noticeable difference. Keeping the car away from prolonged sunlight, moisture, excessive heat, and ozone sources helps protect the tires, and an owner planning a longer drive should always recheck pressure and overall condition rather than assuming a seldom-driven tire is still road-ready.