1966 Triumph Spitfire Tires

A 1966 Triumph Spitfire uses either a 560-13 bias-ply tire or a 155R13 radial tire. Both sizes are associated with the Spitfire and both use a 13-inch rim, so the main difference is the tire's sizing system and construction rather than wheel diameter.

That makes the key choice a construction decision. A 560-13 keeps the car in a traditional numeric bias-ply format, while 155R13 follows a Euro-metric radial format. Before choosing between them, confirm the actual wheel width on the car and check whether the Spitfire still has its original wheel and suspension setup.

The 1966 Triumph Spitfire uses a 13-inch rim diameter with both of its primary tire fitments. The bias-ply 560-13 and the radial 155R13 are both built around that same basic wheel diameter, which keeps rim diameter simple even though the tire constructions differ.

Rim diameter is only part of the fitment picture, so wheel width still matters. Product specifications in these sizes show different rim-width ranges, especially between the bias-ply and radial options. It is worth measuring the actual wheel before selecting a tire, particularly if the car has been fitted with replacement steel wheels or aftermarket wheels at some point.

Yes. The 1966 Triumph Spitfire Base follows the same fitment pattern as the model overall, using either 560-13 in bias-ply construction or 155R13 in radial construction. There is no separate tire size unique to the Base within the covered fitment range.

That means the selection process is more about the type of tire than about sub-model differences. A buyer can focus on whether the goal is a restoration-oriented bias-ply appearance or a radial setup in the correct 13-inch diameter. Wheel width, sidewall style, and the car's current condition still deserve a closer look before finalizing the choice.

On a 1966 Triumph Spitfire, 560-13 is a bias-ply tire size. It uses the older numeric sizing system and is offered in classic bias-ply series from BFGoodrich and Firestone, including whitewall variations that lean toward a traditional vintage presentation.

That makes 560-13 the size to look at when preserving the older visual character of the car matters. A radial alternative does exist, but it should be treated as a different construction path rather than the same tire in another form. Wheel width, handling preference, and the car's intended use all deserve consideration before making the switch.

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. These are equivalent-size alternatives for the original bias-ply fitment, not simply alternate ways of writing the same tire.

Each equivalent follows a different sizing convention, so the practical comparison is broader than just matching the 13-inch rim diameter. A 4- to 5-inch rim-width range is tied to this equivalent group, and the car should also be checked for wheel compatibility and running clearance before moving away from the original 560-13 format.

Start by confirming the actual wheel diameter and width on the car, then compare the intended radial size against the original 560-13 fitment path. For the 1966 Triumph Spitfire, radial choices tied to that bias-ply size include 155R13, P155/75R13, and P155/70R13.

A conversion should also include clearance checks at the fenders and through the steering range, along with a close look at suspension condition. Older sports cars often feel very sensitive to tire changes, so it helps to think through the car's purpose first. A restoration-minded Spitfire may favor the traditional bias-ply look, while a driver may lean toward radial construction.

The first consideration is staying with the correct construction and size for the setup you want. A 560-13 tire keeps the 1966 Triumph Spitfire in its numeric bias-ply format, and available choices include BFGoodrich and Firestone options in classic bias-ply series with different whitewall treatments.

From there, compare sidewall appearance, rim-width specifications, and product details such as load capacity where shown. Some 560-13 products call for slightly different wheel widths, so the tire should match the wheel already on the car. That helps narrow the choice between a narrow whitewall, a wide whitewall, and the brand or series that best suits the car's presentation.

Available sidewall styles for 1966 Triumph Spitfire tires include blackwall in the radial 155R13 group, plus narrow whitewall and wide whitewall in the 560-13 bias-ply group. Those options create a clear visual split between a simpler radial presentation and a more traditional whitewall bias-ply look.

The right sidewall style depends on how the car is being finished and used. A blackwall radial suits owners who want a cleaner, more understated sports-car appearance, while whitewall bias-ply tires push the car toward a stronger vintage look. It is worth deciding on appearance early, because sidewall style and construction are tied together in this fitment range.

Tires for the 1966 Triumph Spitfire are available from Michelin, Dunlop, BFGoodrich, and Firestone. Michelin and Dunlop appear in the 155R13 radial fitment, while BFGoodrich and Firestone cover the 560-13 bias-ply size with classic-style whitewall offerings.

Brand choice should follow the type of tire you want rather than the other way around. A buyer considering radial construction will be comparing Michelin and Dunlop blackwall options, while a buyer staying with bias-ply construction will be comparing BFGoodrich and Firestone by sidewall treatment, series, and wheel-width compatibility. That keeps the decision grounded in fitment and appearance instead of brand name alone.

For a period-style 1966 Triumph Spitfire, the 560-13 bias-ply size is the natural starting point because it keeps the car in its vintage numeric format. BFGoodrich and Firestone offerings in this size also bring classic-style whitewall presentations that can support a more restoration-oriented visual direction.

That does not automatically make any one tire factory-correct for every car, especially when originality standards vary by market, owner history, and restoration goal. When exact historical detail matters, compare the tire choice against marque references or period vehicle documentation. If the priority is simply a convincing vintage look, construction and sidewall style matter most.

Tire construction changes the visual character of a restored 1966 Triumph Spitfire more than many owners expect. A 560-13 bias-ply tire carries a traditional vintage format and is available with narrow whitewall or wide whitewall styling, while the 155R13 radial choices are blackwall tires with a more modern overall presentation.

That difference can shape how the whole car reads at a glance, especially on a small British sports car where the tire is so visible. Restoration-minded buyers often start with appearance, then confirm that the construction also fits their intended road use. Looking at sidewall treatment and wheel width together usually helps settle the decision more quickly.

Yes. Modifications can affect tire fitment on a 1966 Triumph Spitfire even when the tire size itself is correct. Changes such as aftermarket wheels, altered wheel width, suspension work, ride-height changes, or body modifications can influence how either a 560-13 bias-ply or 155R13 radial tire sits and clears.

That is why an older sports car should be checked as it actually stands today, not only by year and model. Turn the steering from lock to lock, inspect fender and suspension clearance, and verify the wheel dimensions before mounting tires. A modified Spitfire may still use the proper 13-inch rim diameter while needing closer attention in other fitment areas.

Before driving a 1966 Triumph Spitfire on new tires, inspect the wheels, valve stems, lug hardware, and overall tire seating, then confirm tire pressure and basic running clearance. It also helps to look over the suspension and steering components, since fresh tires can reveal looseness or wear that older tires may have been masking.

A short initial drive followed by a second inspection is a smart habit on a collector-era car. Recheck pressure, look for any signs of rubbing, and pay attention to how the car tracks and steers. On a lightweight vehicle such as a Spitfire, small setup issues can become noticeable quickly once correct new tires are installed.

560-13 tires on a collector 1966 Triumph Spitfire should be maintained with regular pressure checks, visual inspections, and careful storage habits. Look for cracking, cuts, bulges, uneven tread wear, or slow air loss, especially if the car spends long stretches parked between drives.

Collector vehicles often age their tires by time and storage conditions as much as by mileage. Keeping the car away from prolonged sunlight, moisture, and ozone sources helps protect the tire over time. It is also wise to inspect the tires before any longer outing, since an older roadster tends to make tire condition immediately noticeable in ride and steering feel.