1976 Triumph Spitfire Tires

The 1976 Triumph Spitfire uses two primary tire sizes: 155R13 in radial construction and 560-13 in bias-ply construction. Both sizes are tied to 13-inch wheels, so the choice is not about changing wheel diameter but about selecting the construction and tire style that suits the car.

That makes the next step fairly straightforward. Confirm whether the Spitfire is staying with a radial setup or being fitted with a traditional bias-ply tire, then compare the tire's wheel-width requirements, sidewall style, and overall appearance. On a car that has seen wheel or suspension changes, checking actual wheel width and clearance remains important before final selection.

The tire fitments for a 1976 Triumph Spitfire are built around a 13-inch rim diameter. Both the 155R13 radial and the 560-13 bias-ply size use that same wheel diameter, which keeps the main fitment decision centered on tire construction rather than a different rim size.

Rim diameter is only part of the story, though. Wheel width still matters, especially when moving between bias-ply and radial choices, because the available products do not all share the same width range. It is worth checking the actual wheel on the car before ordering, particularly if the Spitfire has replacement steel wheels, aftermarket alloys, or a long-ago restoration.

Yes. The 1976 Triumph Spitfire Base follows the same fitment pattern here, using either a 155R13 radial or a 560-13 bias-ply tire. There is no separate trim-specific tire size to sort through in this application, which simplifies the search once the car's intended setup is clear.

That still leaves an important decision for the owner. A Base-model Spitfire can be kept on a blackwall radial presentation or moved toward a more traditional bias-ply look with whitewall options. Since both constructions share the same 13-inch rim diameter, checking wheel width and deciding how original or road-oriented the finished car should feel are the most useful next steps.

On the 1976 Triumph Spitfire, 560-13 is the bias-ply tire size. It is the vintage numeric format in this application, while 155R13 is the radial size. That distinction matters because the two fitments represent different construction types even though both use the same 13-inch rim diameter.

A bias-ply choice usually appeals to owners chasing a more traditional look and tire character, especially with available whitewall styles. A radial choice points the car in a different direction without changing wheel diameter. Before switching between the two, it is smart to confirm actual wheel width and make sure the tire's construction matches the Spitfire's intended use and appearance.

Radial equivalents for 560-13 include 155R13 as the 80-series metric radial option, P155/75R13 as the 75-series P-metric radial option, and P155/70R13 as the 70-series P-metric radial option. These are equivalent-size alternatives for the original bias-ply format rather than additional primary factory fitments.

Each equivalent uses a different sizing convention, so the best way to compare them is by wheel compatibility and how the tire suits the car's overall setup. A recommended rim-width range of 4 to 5 inches applies to the equivalent sizing, and actual fit should still be checked against wheel width, body clearance, and the condition of the Spitfire's suspension and steering components.

Start with the wheel itself. A 1976 Triumph Spitfire keeps the same 13-inch rim diameter whether it uses 560-13 bias-ply tires or a radial alternative, but wheel width becomes an important factor once a radial is being considered. The radial-equivalent range for 560-13 is tied to a 4 to 5 inch rim width.

After that, compare the intended radial size with the car's actual setup. Steering clearance, fender clearance, ride height, and any replacement wheels should all be reviewed before making the change. On a lightly used British sports car, it also helps to inspect suspension bushings and alignment condition so the new tires are evaluated on a sound, roadworthy foundation.

The first decision is whether the car should run a 155R13 radial or a 560-13 bias-ply tire. Both use a 13-inch wheel diameter, so the real difference is construction, appearance, and the wheel-width requirements that go with each product family. That choice shapes the rest of the buying process.

Once the construction is settled, compare brand, tire series, sidewall style, and wheel-width compatibility. A radial blackwall setup gives the Spitfire one kind of presentation, while a bias-ply whitewall setup gives it another. It also helps to think honestly about how the car is used, because a show-focused restoration and a regularly driven roadster may call for different priorities.

Sidewall style depends on which tire size and construction you choose for the 1976 Triumph Spitfire. The 155R13 radial options are offered as blackwalls, while the 560-13 bias-ply options include narrow whitewall and wide whitewall treatments. That makes sidewall appearance a meaningful part of the selection process.

A blackwall radial usually keeps the presentation simple and sports-car oriented, while whitewall bias-ply tires push the car toward a more traditional vintage look. The right choice depends on how the Spitfire is being finished and driven. Since sidewall style is tied to specific products and constructions, it makes sense to choose the tire type first and appearance second.

Tires for the 1976 Triumph Spitfire are available from Michelin, Dunlop, BFGoodrich, and Firestone. Michelin and Dunlop cover the 155R13 radial side of the fitment, while BFGoodrich and Firestone provide 560-13 bias-ply options with vintage-style sidewall treatments.

Brand choice should be weighed alongside construction and tire series rather than treated as a separate decision. A buyer comparing these options is really deciding between radial and bias-ply character, blackwall versus whitewall appearance, and the rim-width ranges attached to each product. Matching the brand to the correct size and intended look matters more than chasing a name alone.

For a period-style 1976 Triumph Spitfire, the 560-13 bias-ply fitment is the most naturally vintage-looking starting point. That size is available in classic bias-ply series from BFGoodrich and Firestone, with narrow whitewall and wide whitewall sidewall treatments that create a distinctly traditional presentation on a 13-inch wheel.

The final choice depends on how strictly the car is being restored and what look suits the finished vehicle. A period-style result does not automatically mean any whitewall or any brand is exact to the car as delivered. When originality matters at a high level, it is wise to compare the tire choice against marque references, period photos, or restoration documentation.

Tire construction changes the visual character of a restored 1976 Triumph Spitfire more than many owners expect. A 155R13 radial keeps the car in a blackwall radial format, while a 560-13 bias-ply tire brings in a more traditional sizing style and opens the door to narrow or wide whitewall sidewall treatments.

That difference can shift the whole impression of the car, especially on a small British roadster where the tire is so visible against the wheel opening. Construction also affects the type of wheel-width range that should be checked before installation. A restoration-minded buyer should balance visual authenticity, road use, and the actual wheel setup already on the car.

Yes, modifications can affect tire fitment on a 1976 Triumph Spitfire even when the nominal tire size looks correct. Replacement wheels, altered ride height, suspension changes, and bodywork variations can all change how a 155R13 radial or 560-13 bias-ply tire sits in the wheel opening and how much clearance it has in steering travel.

That is especially worth checking on older sports cars that may have passed through several owners over the years. Measuring actual wheel width and confirming the car still has adequate fender and suspension clearance is a better approach than assuming any 13-inch setup is unchanged. A quick inspection now can prevent rubbing, alignment issues, or mismatched wheel-to-tire combinations later.

Before driving a 1976 Triumph Spitfire on new tires, inspect the wheels for damage, confirm the wheel diameter and width, and make sure the tire size matches the intended setup. It also helps to check for worn suspension parts, steering looseness, and alignment issues that could affect how the new tires behave on the road.

Collector cars often spend long periods parked, so it is smart to look beyond the tires themselves. Brake condition, wheel fastener security, and smooth air retention should all be reviewed before heading out. After the first few drives, rechecking tire pressure and looking for any signs of rubbing or uneven wear can catch small setup problems before they become larger ones.

Tires on a collector 1976 Triumph Spitfire should be inspected regularly for cracking, cuts, bulges, uneven wear, and gradual air loss, even if the car is driven only occasionally. Both radial and bias-ply tires can age while the car sits, so condition matters just as much as tread depth on a lightly used vintage roadster.

Storage habits also make a difference. Keeping the car away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve the tires between drives. Checking pressure before road use and giving the tires a careful visual inspection before a longer outing are sensible routines, especially on a small sports car where handling feel can change quickly when tires are neglected.