Triumph Spitfire Tires

The Triumph Spitfire uses two listed tire sizes across the 1962 through 1980 production range: 155R13 and 560-13. Both sizes fit 13-inch rims, but they represent different tire constructions and sizing systems. 155R13 is a radial size, while 560-13 is a numeric bias-ply size. The available 155R13 products are mounted on 13-inch rims with listed rim widths including 4.00 to 5.50 inches, while 560-13 products are also for 13-inch rims with listed rim widths ranging from 3.50 to 4.50 inches.

That means the correct choice for a Triumph Spitfire is not just a matter of year, because every year in this group shows both sizes. The more important question is whether the car is staying period-correct on bias-ply tires or has wheels and driving expectations better suited to radials. Check the wheel width on the car, compare it to the rim-width ranges listed for the tire you are considering, and make sure all four tires match in type and size.

A 560-13 tire on a Triumph Spitfire is a numeric bias-ply size. The 560 is the nominal section width with the decimal omitted, putting it in the 5.60-inch class, and the 13 identifies the wheel diameter in inches. The available products in this size are bias-ply tires built for 13-inch rims, with listed rim-width ranges from 3.50 to 4.50 inches depending on the specific tire. Sidewall choices in this size include narrow whitewall and wide whitewall versions.

For a Triumph Spitfire owner, 560-13 points toward a period-style appearance and the traditional response associated with bias-ply construction. That can matter on a restoration, especially if the goal is to preserve the car's original visual stance rather than move to later radial behavior. Because the wheel width range is narrower than some radial options, it is worth measuring the installed wheels before making a final choice, and a tube is required with this bias-ply fitment.

The listed Triumph Spitfire tire options in this range all use a 13-inch rim diameter. That is true for both the 155R13 radial fitment and the 560-13 bias-ply fitment. The difference between the two sizes is not wheel diameter but tire construction, sizing language, and suitable rim-width range. Radial products in 155R13 are listed for 13-inch rims, and the bias-ply 560-13 products are also listed for 13-inch rims.

That simplifies one major fitment question on the Triumph Spitfire, because you do not have to sort through multiple wheel diameters across the years shown here. Even so, you should still verify the wheel width on the actual car, since the radial and bias-ply choices are intended for somewhat different rim-width ranges. A 13-inch rim is only the starting point; matching the wheel width to the selected tire is what helps preserve proper fit and appearance.

The Triumph Spitfire requires inner tubes when fitted with the listed 560-13 bias-ply tires. That size is a traditional numeric bias-ply fitment, and the available products do not indicate a tubeless bias-ply configuration. The 155R13 radial products are separate radial offerings and should be treated according to the wheel and tire combination actually being used. Tube use therefore depends on whether the car is running the period-style bias-ply size or the radial size.

For a Triumph Spitfire owner trying to keep the car authentic, tubes are part of the normal setup when choosing 560-13 bias-ply tires. If the car has been moved to radial tires, the tube question should be settled by the wheel design and the tire specification rather than by assumption. The safest approach is to inspect the wheels closely for condition and design, then fit the tire system that matches the intended construction instead of mixing bias-ply habits with radial parts.

The Triumph Spitfire has listed options in both bias-ply and radial construction, so the right choice depends on the purpose of the car. The 560-13 size represents the period-style bias-ply route, while 155R13 represents the radial route. Both fit 13-inch wheels, but they do not deliver the same look or driving character. Bias-ply tires suit owners seeking an earlier appearance and more traditional behavior, while radial tires suit owners who want a later construction style within the same overall wheel diameter.

A restored Triumph Spitfire that is shown for authenticity often benefits visually from the bias-ply option, especially with the available whitewall styles. A driver-focused car may feel more in step with modern traffic on radials, particularly if the suspension and alignment are set with radial use in mind. Decide first whether originality or regular road use is the priority, then choose one construction type for the full set rather than treating tire selection as a cosmetic detail.

Yes, radial tires can change how a Triumph Spitfire feels on the road when compared with bias-ply tires. The 155R13 radial option uses a different construction method than the 560-13 bias-ply option, and that difference typically affects steering response, tracking, and the overall impression of the car in motion. Even with the same 13-inch rim diameter, the tire construction itself is a major part of how the car rides and reacts. That is why both types appear in the fitment range but should not be treated as interchangeable in character.

For a Triumph Spitfire owner, the practical implication is that changing to radials can make the car feel less period-correct even if the fit is dimensionally appropriate. Suspension condition, wheel width, and alignment become more important when the goal is to get the best result from a radial setup. If the car has spent years on one construction type, plan to evaluate handling and steering feel carefully after any switch rather than assuming the change will be neutral.

A Triumph Spitfire should be fitted with one construction type across the full set rather than mixing the listed 560-13 bias-ply tires with 155R13 radial tires. Although both sizes use 13-inch rims, the constructions behave differently under load, cornering, and braking. The mismatch is more significant than the shared wheel diameter because the tire carcass design influences the way the car responds. On a lightweight sports car like the Triumph Spitfire, consistency matters.

The practical approach is to choose the tire strategy first and complete the car in one matched set. If the goal is a traditional restoration, stay with bias-ply all around; if the goal is regular road driving, move to a matched radial set with suitable wheel widths. Mixing types can create an unsettled feel that makes it harder to judge what the chassis is doing, which is the opposite of what you want from a simple and communicative roadster.

A 1970 Triumph Spitfire appears with both 155R13 and 560-13 in the listed fitment range, so year alone does not settle the choice. Both sizes are for 13-inch rims, but 155R13 is a radial fitment and 560-13 is a bias-ply fitment. The radial products are listed for wider rim-width ranges than the bias-ply products, which is one useful clue when checking an individual car. The sidewall appearance also differs, since the bias-ply choices include whitewall options while the radial choices are blackwall.

Start by looking at the car's current wheels, the width of those wheels, and the intended use of the Triumph Spitfire. A restoration that aims for a more period look will often point toward 560-13, while a road-driven car may be better suited to 155R13. If the car's history is unclear, compare the installed wheel width with the listed ranges and review any restoration records so the tire decision supports both fit and the character you want from the car.

Triumph Spitfire tire options in this range include blackwall, narrow whitewall, and wide whitewall sidewall styles. The 155R13 radial offerings are blackwall tires, while the 560-13 bias-ply offerings include a 1.00-inch whitewall and 2.25-inch whitewall choices. That means the sidewall look is closely tied to the construction type as well as the size. A buyer choosing between the two Spitfire sizes is also choosing between different visual treatments.

For a Triumph Spitfire restoration, sidewall style can shape the car's overall presentation almost as much as the wheel design. A blackwall radial tends to suit a more driver-oriented or later-updated presentation, while whitewall bias-ply tires create a more period-conscious look. The best choice depends on how the specific car is being restored and presented, so it is worth deciding whether appearance or modernized road use is the priority before settling on a sidewall style.

The listed Triumph Spitfire tire options come from Michelin, Dunlop, BFGoodrich, and Firestone. Michelin and Dunlop appear in the 155R13 radial size, while BFGoodrich and Firestone appear in the 560-13 bias-ply size. That spread gives the Triumph Spitfire owner both construction choice and brand choice, rather than limiting the car to a single approach. The available tire series also differ by brand, particularly between the radial and classic bias-ply offerings.

Brand choice on a Triumph Spitfire should follow the larger fitment decision instead of replacing it. First decide whether the car should wear radial or bias-ply tires, then compare the brands available within that size and construction. That keeps the selection process in the right order and helps avoid choosing a tire purely by name when the more important issue is how the tire fits the wheel, complements the restoration, and matches the way the car will actually be used.

The listed Triumph Spitfire tire series are Michelin XAS-FF, SP Sport Aquajet, Silvertown Classic Bias Ply, and Firestone Classic Bias Ply. Michelin XAS-FF and SP Sport Aquajet are radial offerings in the 155R13 size, while Silvertown Classic Bias Ply and Firestone Classic Bias Ply are bias-ply offerings in the 560-13 size. The biggest difference among these series is construction technology rather than wheel diameter, since all of them are built for 13-inch rims. Sidewall presentation also varies, especially within the bias-ply choices.

For a Triumph Spitfire owner, the series names matter most after the basic fitment path is settled. Radial series suit owners prioritizing later tire behavior and blackwall appearance, while the classic bias-ply series suit owners focused on period style and traditional stance. Once the construction choice is made, compare the wheel width on the car and the sidewall style you want, because those details often have a greater effect on satisfaction than the series name alone.

A Triumph Spitfire should be stored on a clean, dry surface away from direct sunlight, electric motors, and ozone-producing equipment that can age rubber more quickly. Keep the tires properly inflated for storage, and if the car will sit for long periods, move it occasionally or support it in a way that reduces prolonged flat spotting. Collector cars with light use often age their tires by time and environment more than by mileage. That is especially relevant when preserving both the look and ride quality of a small sports car.

Good storage helps a Triumph Spitfire whether it wears radial tires or period-style bias-ply tires, but it is especially helpful when the car is only driven seasonally. Bias-ply tires can be more prone to taking a set when left in one position, and even radial tires benefit from regular movement and stable inflation. If the car is part of a restoration collection, make tire checks part of the same routine as battery care, fluid checks, and paint preservation.

Tires on a Triumph Spitfire should be inspected before each drive and given a more careful condition check several times a year, even if the car is used sparingly. Look for cracking, weathering, uneven wear, impact damage, low pressure, and any sign that the tire is no longer seating or wearing normally. On a light sports car, small changes in tire condition can alter steering feel quickly. The inspection routine matters just as much for collector cars that sit as it does for cars that cover regular miles.

A Triumph Spitfire rewards close attention because its light weight and direct steering make tire issues easier to feel but also easier to overlook until they become serious. Make a habit of checking pressures when the tires are cold and inspecting the sidewalls both inside and out. If the car is stored for part of the year, inspect the tires again when bringing it back into service rather than assuming they are unchanged from the last outing.

Tires on a Triumph Spitfire should be replaced when age, cracking, hardening, bulges, irregular wear, or other signs of structural decline appear, even if the tread still looks usable. Collector cars often age out their tires long before they wear them out. That applies to both 155R13 radials and 560-13 bias-ply tires, because rubber deterioration is driven by time, storage, and use history as much as mileage. A tire that looks acceptable at a glance may still be too old or compromised for confident road use.

For a Triumph Spitfire owner, replacement decisions should lean toward caution rather than squeezing extra years from low-mileage tires. The car is light, but its steering and braking still depend on a sound contact patch and consistent carcass condition. If there is any doubt about age or internal condition, have the tires evaluated by a specialist familiar with collector vehicles, then treat that assessment as part of the normal maintenance cycle rather than waiting for visible tread wear alone.

The listed Triumph Spitfire fitments include both 560-13 bias-ply tires and 155R13 radial tires, all on 13-inch rims. That indicates more than one legitimate tire approach exists within the model's production range rather than a single universal answer for every car. The bias-ply offerings appear in classic series, while the radial offerings appear in Michelin and Dunlop radial series. A specific Triumph Spitfire may therefore align more closely with one or the other depending on how it is being restored.

For an originality-minded Triumph Spitfire restoration, the best next step is to compare the car's existing wheel setup and any period reference material tied to that specific car. The presence of both bias-ply and radial choices means authenticity can hinge on the exact restoration target, not just the model name. Marque clubs, factory literature, and long-term ownership history are the best references when the goal is to recreate a particular specification rather than simply fit a usable 13-inch tire.

Yes, correct tire fitment can affect both judging and perceived value on a Triumph Spitfire, especially when the car is presented as an authentic restoration. Tire construction, size format, and sidewall style all influence whether the car looks consistent with its restoration goal. A 560-13 bias-ply whitewall presentation tells a different story than a 155R13 blackwall radial presentation, even though both are 13-inch fitments. Judges and knowledgeable buyers often notice those differences immediately.

For a Triumph Spitfire being restored for shows, tire choice should match the era, stance, and trim presentation the owner is aiming to capture. For a car restored as a driver, value may come more from coherence and quality than strict period presentation, but the tire still needs to make visual and mechanical sense. When judging standards matter, compare your chosen tire against accepted club practice and period imagery before finalizing the setup.

The listed Triumph Spitfire options include blackwall in the 155R13 radial size and both narrow whitewall and wide whitewall in the 560-13 bias-ply size. That means more than one sidewall presentation is available for the model, but each one carries a different visual message. Blackwall aligns with the radial fitment path, while the whitewall choices belong to the period-style bias-ply fitment path. Sidewall style and construction therefore work together on a restoration rather than as separate decisions.

A Triumph Spitfire restoration should use the sidewall style that matches the intended historical look of the specific build. If the goal is a traditional presentation with a classic bias-ply stance, the available whitewall options support that direction; if the goal is a later road-going or more understated look, blackwall radial tires may be the better visual match. Review period photos and club standards for the exact appearance you want before choosing between narrow whitewall, wide whitewall, and blackwall.

A Triumph Spitfire can be driven on public roads when its tires are correctly fitted, in sound condition, and matched to the way the car is used. The listed options include both radial and bias-ply constructions, and each can be appropriate when the wheel size, wheel width, and overall condition are right. Safety depends less on the name on the sidewall than on age, condition, proper inflation, and using a matched set. A tired collector tire is a greater concern than whether the construction is period-correct or later radial.

For a road-driven Triumph Spitfire, inspect the tires carefully before use and be realistic about the limits of an older lightweight sports car. Bias-ply tires may preserve an authentic feel, while radials may better suit regular road driving, but neither should be used past its useful age. The car's suspension, steering, and brake condition also matter, because tire performance can only be as good as the chassis underneath it.

Before driving a Triumph Spitfire, check cold tire pressure, inspect the sidewalls and tread for cracking or damage, and confirm that all four tires match in size and construction. Make sure the wheel width suits the tire being used, particularly if the car has moved between 560-13 bias-ply tires and 155R13 radial tires at some point in its life. A quick look for uneven wear can also reveal alignment or suspension issues. On a small sports car, those details are closely tied to predictable handling.

That routine should become second nature with a Triumph Spitfire, especially if the car is not driven every week. A few minutes in the garage can prevent a drive from being spoiled by vibration, wandering, or a tire problem that could have been caught early. If the car has been sitting, add a check for flat spotting and make sure the spare, if carried, is in usable condition and matched to the overall tire strategy on the car.

A Triumph Spitfire on period-style tires should be driven at sensible speeds that respect the age, construction, and condition of the tires actually fitted. The listed fitments include both 560-13 bias-ply tires and 155R13 radial tires, and those two constructions do not behave the same way at speed. Safe road pace is influenced not only by tire type but also by rubber age, storage history, suspension condition, and whether the car has been maintained for regular driving. A freshly inspected car on sound tires is very different from one emerging from long storage.

For a Triumph Spitfire owner, the wise approach is to build speed gradually and let the car tell you how stable and settled it feels. Period-style bias-ply tires generally call for a more conservative pace and longer stopping margin than many drivers expect today, while radials may feel more composed if the chassis is set up for them. Treat any collector tire as part of a complete system, and keep road speed comfortably within the limits of the car, the tires, and the conditions.