1965 Triumph Tire Fitment Guide

1965 Triumph vehicles use four sizes across three model groups. The Spitfire and Sports Six use either 155R13 radial or 560-13 bias-ply tires on 13-inch wheels. The TR3, TR4, and TR4A use either 165R15 radial or 590-15 bias-ply tires on 15-inch wheels. Rim width ranges where available are 4.00 to 5.50 inches for 155R13, 3.50 to 4.50 inches depending on brand for 560-13, 4.50 to 6.00 inches for 165R15, and 4.00 to 4.50 inches for 590-15.

That means year and make alone are not enough for a correct choice on a 1965 Triumph. Start by identifying whether you have a small-chassis Spitfire-family car or a TR model, then verify whether your wheels match the rim diameter and width range used by the size you want to run. Once those basics are settled, the remaining choice is usually between a bias-ply tire that preserves a more period-correct look and a radial tire that changes the driving character.

On a 1965 Triumph, 560-13 is a traditional numeric bias-ply size. The 5.60 figure refers to the nominal section width in inches, and the 13 is the wheel diameter in inches. It was used on the Spitfire and Sports Six, not on the TR3, TR4, or TR4A. Available versions include narrow whitewall and wide whitewall styles from BFGoodrich and wide whitewall versions from Firestone, with load figures reaching 850 pounds at 30 psi.

This size matters most to an owner who wants the smaller Triumph sports cars to look and feel closer to their mid-1960s roots. Numeric bias-ply sizes are familiar to restorers because they preserve the period style of the tire code itself as well as the construction. If your car already has 13-inch wheels and you are aiming for a more traditional appearance rather than a radial driving feel, 560-13 is the historic-style path worth considering.

For a 1965 Triumph, 155R13 is a metric radial size used on the Spitfire and Sports Six. The 155 is the nominal section width in millimeters, the R identifies radial construction, and the 13 is the wheel diameter in inches. Because no aspect ratio is printed in the size itself, this format is conventionally treated as an 80-series metric radial. Michelin and Dunlop both offer blackwall versions, and both examples carry an H speed rating with a 130 mph ceiling.

Modern buyers often find this code easier to relate to than the older numeric bias-ply format because it is closer to contemporary radial sizing practice. Even so, it is still a period-style European radial size, not the same thing as substituting a modern plus-size tire. If your 1965 Triumph is a Spitfire or Sports Six and you want to stay on 13-inch wheels while moving to radial construction, 155R13 is the key size to understand.

That choice applies to the 1965 Triumph Spitfire and Sports Six, since both sizes fit those two models on 13-inch wheels. The 155R13 is a radial size offered in blackwall form by Michelin and Dunlop, while the 560-13 is a bias-ply size available from BFGoodrich and Firestone with whitewall options. The practical difference is construction and appearance rather than wheel diameter. One leans toward a more modern radial driving feel, and the other preserves the more traditional character of a 1960s bias-ply tire.

Choose the tire that matches how you want the car to present and behave. A restored car built around era-correct visual cues may point you toward 560-13, especially if whitewall styling matters. A driver-oriented car that still keeps its original 13-inch wheel diameter may point you toward 155R13. The best approach is to decide your goal first, then confirm the wheel width range and sidewall style that suits your specific car.

Sidewall choices vary sharply by size across the 1965 Triumph range. The 155R13 radial is available as a blackwall, and the 165R15 radial comes in blackwall, narrow whitewall, and wide whitewall versions. On the bias-ply side, 560-13 is available in narrow whitewall and wide whitewall form, while 590-15 comes in blackwall and wide whitewall versions. That gives owners different ways to tune the final look depending on whether the goal is understated sports-car simplicity or a more stylized period presentation.

For many British sports car restorations, blackwall tires often feel most natural visually, especially on cars presented in a competition-influenced or European-market style. Whitewalls can still make sense when an owner wants a particular period showroom look or a personalized presentation. Since the same 1965 Triumph family can wear very different sidewalls depending on size and series, it helps to decide whether you are restoring to a specific image, building a driver, or balancing both.

Several brands cover the 1965 Triumph range, but they do so by size rather than across every model equally. Michelin and Dunlop offer 155R13 radial tires for the Spitfire and Sports Six. BFGoodrich and Firestone cover 560-13 bias-ply fitments, while the TR3, TR4, and TR4A are served by 165R15 radials from Coker Classic, American Classic, Firestone, and BFGoodrich plus 590-15 bias-ply options from BFGoodrich and Avon.

That mix gives a buyer some real room to tailor the car's final look and character without stepping outside the correct size family. A brand decision on a 1965 Triumph is usually secondary to choosing the right size, wheel diameter, and construction, but it can influence sidewall style, load figure, and the overall visual impression. Once you know your model and target construction, the brand field becomes much easier to sort through intelligently.

Rim width depends on the exact tire size used on your 1965 Triumph. The 155R13 radial fits rims from 4.00 to 5.50 inches wide. The 560-13 bias-ply runs on 3.50 to 4.00 inch rims in BFGoodrich form and 4.00 to 4.50 inch rims in Firestone form. The 165R15 radial fits 4.50 to 6.00 inch rims, while the 590-15 bias-ply uses 4.00 to 4.50 inch rims where that range is published.

Those numbers matter because correct wheel diameter alone does not automatically make a tire a good match for your wheel. Before choosing a tire for any 1965 Triumph, compare your actual wheel width to the approved range for the exact brand and size you want to use. That is especially important if your car has replacement wheels, wire wheel conversions, or a mix of parts accumulated over decades of ownership and restoration.

Inner-tube requirements vary by size and by product on a 1965 Triumph. The Michelin 155HR13 is marked TL, which identifies it as tubeless, while the Dunlop 155R13 does not carry the same tube marking in its size description. The bias-ply sizes 560-13 and 590-15 also do not show a uniform tube designation across every product name or size marking. That means tube use should be confirmed against the exact tire and the wheel type you are using rather than assumed from size alone.

This is one of the setup details that becomes especially important on older British sports cars because wheel design and condition can influence the final answer. A tubeless tire may still be paired with a tube in some circumstances, while a tube-type arrangement demands proper tube and flap selection where applicable. If your 1965 Triumph has original-style wheels, wire wheels, or long-stored rims of uncertain condition, verify the sidewall marking and consult a Triumph specialist before final assembly.

A stored 1965 Triumph should be kept in a cool, dry, dark place away from direct sunlight, electric motors, welders, battery chargers, and other ozone-producing equipment that accelerates sidewall aging. Maintain proper inflation and move the car periodically so it does not rest on one footprint for too long. Bias-ply tires such as 560-13 and 590-15 are generally more prone to temporary flat-spotting during storage than radial sizes like 155R13 and 165R15, especially if the car sits for long periods.

For a collector Triumph that only comes out in good weather, storage habits can matter as much as miles driven. If the car will sit for months, some owners prefer to roll it occasionally or support it in a way that reduces long static loading. Good storage practice preserves appearance as well as function, which is especially worthwhile on a 1965 sports car where sidewalls are highly visible and a fresh-looking tire contributes a lot to the car's overall presentation.

Tires on a 1965 Triumph should be judged more by age and condition than by tread wear alone, since many collector cars cover limited annual mileage. A sensible rule is to begin evaluating them closely once they reach the five- to seven-year range and to give serious replacement consideration around the ten-year mark even if the tread still looks usable. The DOT date code on the tire is the simplest way to confirm age when planning maintenance.

That timeline matters because an older sports car can spend years looking fine while the rubber quietly hardens, cracks, or loses resilience. A lightly driven Spitfire or TR may never wear out a set in the modern commuter sense, but age can still make the tires less trustworthy on wet roads, at speed, or after long storage. Regular age checks help you avoid treating appearance as proof of serviceability.

Tires on a 1965 Triumph deserve a quick inspection before every drive and a more thorough one before any longer outing. Check pressure, tread condition, sidewall cracking, cuts, bulges, and any sign of uneven wear. If your setup uses tubes or older-style valve stems, inspect the valve area carefully as well. On a low-mileage collector car, a tire can age or lose pressure while the car is parked, so time in storage is just as relevant as miles on the road.

A short pre-drive routine is especially valuable on 1960s sports cars because they are light, responsive, and quick to transmit any tire issue through the steering. Catching a problem early can prevent damage to a rare wheel, an interruption on a tour, or a roadside tire change with a vintage jack and spare. Make tire inspection part of the same habit as checking oil, coolant, and brake fluid before using the car.

A 1965 Triumph Spitfire would have belonged to an era when bias-ply construction was still the normal original-equipment expectation on many sports cars, even though radial adoption was already becoming more visible in Europe. Within the correct Spitfire size family here, that makes 560-13 the more historically traditional construction choice, while 155R13 represents the radial alternative in the same 13-inch wheel class. Original-market details could still vary by destination market, dealer practice, or owner preference over the decades.

If your goal is a restoration that feels visually and structurally close to mid-1960s showroom character, start by looking at the bias-ply option and the sidewall style that suits your target presentation. If the car is being judged, the event's standards may place real weight on construction type as well as appearance. Triumph clubs, marque experts, and period road tests are useful next steps when you want to confirm what was most typical for your exact market and restoration objective.

Correct tire fitment absolutely matters when a 1965 Triumph is judged for authenticity. Judges and knowledgeable enthusiasts often notice whether the size is right for the model, whether the construction matches the period expectation, and whether the sidewall style fits the way the car would have appeared when new. A Spitfire on an obviously incorrect 15-inch TR size, or a car restored for originality but wearing a visibly modern-looking alternative, can look out of character even to a casual observer.

That does not mean every shown Triumph must wear the same tire, because classes and judging standards vary. Some events welcome touring-oriented radials on otherwise authentic cars, while top-level originality judging can be more demanding about construction and presentation. The safest approach is to match the correct model-specific size first, then verify the event's rules and consult marque specialists before committing to a sidewall style or switching from bias-ply to radial for a judged car.

For a 1965 Triumph Spitfire or Sports Six using 155R13, the Michelin XAS and Dunlop SP Sport Aquajet share the same basic size category and both carry an H speed rating, which corresponds to a 130 mph ceiling. The Michelin is marked 155HR13 78H TL and fits 4.00 to 5.50 inch rims at a listed weight of 20 pounds, while the Dunlop appears as 155R13 78H at a listed weight of 20 pounds and a published load capacity of 937 pounds. Both are blackwall radials.

The real choice between them is less about one being universally better and more about how closely you want the tire's construction details and brand character to align with your car and use. Since both sit in the same radial size family, owners can compare tube marking, rim-width guidance, load figure, and brand preference rather than rethinking the whole fitment. That makes this a refinement decision once you have already committed to the 155R13 radial route.

1965 Triumph tires can be suitable for highway driving when the size, condition, inflation, and construction match the car's intended use. Among the radial options, the 155R13 examples carry an H speed rating with a 130 mph ceiling, and the 590-15 Avon bias-ply also carries an H rating. Other sizes here are not all marked with a speed letter in the same way, so the safe approach is to confirm the sidewall marking on the exact tire you plan to run rather than assume every version shares the same rating.

In practice, the broader limitation on a 1965 Triumph often has more to do with the car's age, braking system, suspension condition, and general mechanical readiness than with the headline speed capability of the tire alone. A well-sorted Spitfire or TR can cruise comfortably when the tires are fresh and properly maintained, but highway use should still be approached with the expectations appropriate to a 1960s sports car rather than a modern daily driver.

Inflation pressure on a 1965 Triumph should begin with the factory recommendation for the exact model, then be checked against the tire's own rated load and pressure figures. The 560-13 bias-ply options here carry 850 pounds at 30 psi. The 165R15 radials run from 1168 pounds at 35 psi to 1170 pounds at 36 psi, while the 590-15 bias-ply options reach 1050 pounds at 32 psi or 1,018 pounds on the Avon example. Those figures are part of the tire's capacity rating, not a blanket instruction to use the same pressure on every Triumph.

Because the 1965 Triumph range spans light 13-inch cars and larger 15-inch TR models, pressure should never be transferred casually from one size or model family to another. Use the owner's manual as the first reference for vehicle setup, then make sure the chosen reproduction or radial tire is being used within its own published limits. If the car has non-original wheel widths, unusual loading, or mixed touring use, a marque specialist can help you fine-tune the setup.

Before a longer drive in a 1965 Triumph, inspect all four tires and the spare for cracking, cuts, punctures, bulges, tread wear, and correct pressure. Check the valve stems carefully, and if your tire and wheel combination uses tubes, make sure the assembly is holding air consistently. It is also wise to confirm that the wheel nuts are properly tightened and that the jack and knockoff or lug tools appropriate to your wheel type are actually in the car.

Tires are only one part of the pre-trip routine on an older British sports car, so pair that inspection with checks of coolant, oil, brake fluid, lights, and charging system health. A long drive is more enjoyable when the car is sorted before departure rather than fixed on the roadside. Since 1965 Triumphs are often used seasonally, the first outing after storage deserves an especially careful once-over, even if the tires still look clean and unworn.