1977 Triumph Spitfire Tires

The 1977 Triumph Spitfire uses two primary tire sizes: 155R13 in radial construction and 560-13 in bias-ply construction. Both sizes are built for a 13-inch rim, so the main difference is not wheel diameter but tire type and sizing convention.

Choosing between them depends on how the car is set up and what kind of result you want. A Spitfire kept closer to a traditional vintage presentation may stay with 560-13 bias-ply tires, while a car using the radial fitment will center on 155R13. It is still wise to confirm the actual wheel width and any past changes before selecting a replacement.

Both primary tire sizes used on the 1977 Triumph Spitfire are designed around a 13-inch rim diameter. That applies to the radial 155R13 size and the bias-ply 560-13 size, so the wheel diameter remains consistent across the two fitment paths.

Rim diameter is only the first check, because width also matters when comparing actual tire options. The radial products and the bias-ply products do not share the same rim-width ranges, so a car with replacement wheels should be measured before changing construction. Matching the tire to the true wheel dimensions helps avoid clearance and handling surprises.

Yes. The 1977 Triumph Spitfire Base can use the same two primary fitments associated with this model: 155R13 as the radial size and 560-13 as the bias-ply size. Both remain 13-inch applications, with construction being the main difference.

That means the buying decision is less about sub-model separation and more about the tire approach you want to take. Owners comparing tires for a Base should focus on whether the car is staying with a bias-ply look, moving to a radial setup, or already wearing wheels that could affect width compatibility. Those checks matter more than trim distinction here.

560-13 is the bias-ply tire size for the 1977 Triumph Spitfire. It uses the older numeric bias-ply sizing system, and available products in this size include traditional bias-ply options rather than radial construction.

That matters because a 560-13 tire delivers a different appearance and wheel-width requirement than the radial alternatives connected to this fitment. Buyers comparing it to a radial conversion should check the wheel width first and make sure the intended tire suits the car's present setup. The choice is usually tied to restoration style, driving expectations, and how original the overall presentation needs to feel.

Radial equivalents for 560-13 include 155R13 as an 80-series metric radial, P155/75R13 as a P-metric 75-series radial, and P155/70R13 as a P-metric 70-series radial. No bias-look radial equivalent is attached to 560-13 in this fitment group.

Those sizes give a useful range of radial alternatives, but they should be treated as options to evaluate rather than automatic substitutes. A recommended rim-width range of 4 to 5 inches is associated with these equivalents, and the final decision should also account for the Spitfire's actual wheel width, tire clearance, and overall vehicle setup before making the switch.

Start by confirming the car's actual wheel diameter and width, then compare that wheel to the rim-width requirements of the radial size being considered. On a 1977 Triumph Spitfire, moving away from 560-13 bias-ply usually means evaluating 155R13 or another listed radial equivalent in the correct 13-inch category.

A close look at front and rear clearance is important, especially if the car has replacement wheels, suspension changes, or body variations from past work. It also helps to inspect steering travel, current tire-to-fender space, and the overall condition of suspension components. Those checks matter more than the size code alone when changing construction on a small sports car.

The first decision is whether the car should stay with the 560-13 bias-ply fitment or use the 155R13 radial fitment. Both are 13-inch sizes, but they differ in construction, sizing format, available brands, sidewall presentation, and rim-width specifications.

Once the correct fitment path is clear, compare the tire's intended look and wheel compatibility rather than focusing on size code alone. A radial blackwall may suit a road-driven Spitfire, while a whitewall bias-ply may suit a more traditional presentation. Checking wheel width, load figures where given, and the overall character you want from the car leads to a better choice.

Sidewall style depends on which tire size and construction you choose for the 1977 Triumph Spitfire. The 155R13 radial options are offered as blackwall tires, while the 560-13 bias-ply options include narrow whitewall and wide whitewall treatments.

That makes sidewall choice part of the car's visual direction as much as its fitment plan. A blackwall radial gives the Spitfire a cleaner European sports-car look, while whitewall bias-ply tires create a more stylized vintage presentation. Since sidewall style is tied to available construction and series choices, it helps to settle the radial-versus-bias decision before narrowing the appearance.

The 1977 Triumph Spitfire has tire options from Michelin and Dunlop in the radial 155R13 size, along with BFGoodrich and Firestone in the bias-ply 560-13 size. Those brands span both of the car's primary fitment directions rather than competing within a single construction alone.

Brand comparison should be tied to the type of tire you actually want on the car. Buyers looking at period European-style radial fitment will be comparing Michelin XAS-FF and Dunlop SP Sport Aquajet choices, while bias-ply shoppers will be focused on BFGoodrich and Firestone classic offerings with whitewall variations. Correct size, wheel compatibility, and overall appearance still come before brand preference.

A period-style 1977 Triumph Spitfire can reasonably point in two different directions depending on the presentation you want. The 560-13 bias-ply size gives the car a more traditional vintage look, while the 155R13 radial keeps the fitment in a classic European radial format that also suits the era.

The best match for a restoration-oriented car depends on how closely the owner wants to follow the car's intended visual character and current wheel setup. Bias-ply tires tend to emphasize a more vintage stance, while radial tires can preserve an era-appropriate feel with a different construction. If exact originality matters, marque-specific historical references should guide the final appearance details.

Tire construction changes the visual character of a restored 1977 Triumph Spitfire as much as it changes the specification on paper. A 560-13 bias-ply tire gives the car a distinctly traditional presentation, especially when paired with narrow whitewall or wide whitewall styling, while a 155R13 radial presents a more understated blackwall look.

That difference is especially noticeable on a small British sports car where the tire fills a modest wheel opening and becomes part of the overall stance. Owners restoring for style consistency should look at tread profile, sidewall treatment, and wheel width together instead of treating construction as an isolated decision. The tire should support the car's finished visual theme, not fight against it.

Yes. Modifications can affect tire fitment on a 1977 Triumph Spitfire even when the size code appears correct. Aftermarket wheels, changes in wheel width, altered suspension height, or bodywork variations can all influence whether a 155R13 radial or 560-13 bias-ply tire has proper clearance.

A careful check should include the true wheel dimensions, steering clearance at full lock, and the relationship between the tire and both the fender and suspension components. That is especially important before using a radial equivalent in place of 560-13. Small sports cars can be sensitive to setup changes, so the actual car should always be inspected rather than relying on size notation alone.

Before driving a 1977 Triumph Spitfire on new tires, inspect the wheels for correct diameter and width, make sure lug hardware and wheel seating surfaces are in good condition, and confirm there is no rubbing through the full steering range. Tire pressure should also be set correctly for the chosen tire before road use.

The rest of the check should focus on the car itself, not just the tires. Look over suspension bushings, shocks, steering components, and wheel bearings, especially on a collector car that may have spent long periods parked. A short initial drive followed by another clearance and pressure check helps catch problems early before the car is used more regularly.

Collector-car tires on a 1977 Triumph Spitfire should be inspected regularly for cracking, cuts, bulges, uneven wear, and slow air loss, whether the car runs 155R13 radials or 560-13 bias-ply tires. Pressure should be checked routinely, because low-use cars often develop tire issues long before the tread is worn out.

Storage conditions matter as much as mileage on a car like this. Keeping the Spitfire away from prolonged sunlight, heat, moisture, and ozone sources helps protect the rubber, and moving the car occasionally can reduce long-term flat spotting. Any tire that shows age-related deterioration or unexplained vibration should be evaluated before the next drive, even if it still looks serviceable at a glance.