1959 Riley Tire Fitment Guide

1959 Riley vehicles use four sizes across two model lines. The Riley 1.5 Litre uses either 145R14 radial or 5.00-14 bias-ply tires on 14-inch rims, while the Riley Two Point Six uses either 195R15 radial or 670-15 bias-ply tires on 15-inch rims. For 145R14, the supported rim width range is 4.00 to 5.00 inches. For 670-15, supported rim width ranges include 4.50 to 5.00 inches and 5.00 to 6.00 inches, depending on the tire.

The practical takeaway is that year and make alone are not enough for a 1959 Riley. You need to identify whether you have the 1.5 Litre or the Two Point Six first, because each model uses a different rim diameter and its own pair of tire sizes. After that, the choice becomes one of construction and presentation rather than simply finding any tire that fits a Riley badge.

On a 1959 Riley, 5.00-14 is a numeric bias-ply size. The 5.00 figure is the nominal section width in inches, and the 14 is the wheel diameter in inches. On this year and make, that size belongs to the Riley 1.5 Litre rather than the Two Point Six. Numeric sizes like this are typical of the period and reflect the sizing language buyers would have seen before metric radial sizes became common.

That matters because 5.00-14 is not interchangeable with the Two Point Six sizes, and it also carries a different character than the 1.5 Litre's radial alternative. Owners restoring a small late-1950s British saloon often choose the numeric bias-ply route for visual and historical accuracy. Owners who plan to use the car more regularly may compare it with the 145R14 radial before making a final decision.

No, 1959 Riley models do not use the same tire size. The 1.5 Litre uses 14-inch sizes, with a choice between 145R14 radial and 5.00-14 bias-ply. The Two Point Six uses 15-inch sizes, with a choice between 195R15 radial and 670-15 bias-ply. Each pair is model-specific, so there is no single universal Riley size for the year.

That split is important when ordering or comparing options because a 14-inch 1.5 Litre tire is not simply a smaller version of a Two Point Six tire. The larger car was built around a different wheel diameter and a different overall fitment family. If the car has been in long-term ownership or has changed hands several times, checking the actual wheel before choosing a replacement is a smart extra step.

For a 1959 Riley 1.5 Litre, the choice between 145R14 and 5.00-14 is mainly a choice between radial and bias-ply construction. The 145R14 is a metric radial on a 14-inch rim, while the 5.00-14 is a period-style numeric bias-ply on the same rim diameter. Both belong to the 1.5 Litre, not the Two Point Six. The radial route generally appeals to owners who want a more modern-feeling driving experience, while the bias-ply route keeps the car closer to its original-era character.

The best choice depends on how the car will be used and judged. A touring or regularly driven 1.5 Litre often points owners toward the radial option, while a restoration focused on authenticity often leans toward the numeric bias-ply size. If your car is being prepared for club judging or a period-correct presentation, confirm event expectations before choosing between the two constructions.

Sidewall style varies across the 1959 Riley size range. The 145R14 radial choices for the 1.5 Litre are blackwall tires, while the 670-15 bias-ply choices for the Two Point Six are available in both blackwall and wide whitewall form. That means sidewall appearance is tied not only to personal taste, but also to model and size. The 15-inch Two Point Six fitment offers the widest visual range in the current selection.

For a British car of this era, blackwalls are usually the safer choice when the goal is restrained factory-style presentation, especially on a compact sporting saloon like the 1.5 Litre. Wide whitewalls create a more stylized period look and may suit a specific restoration vision on the larger Two Point Six. If authenticity matters, compare your chosen sidewall style with original photos, period road tests, and Riley club guidance.

1959 Riley tires are available from several brands depending on size. The 145R14 radial size for the 1.5 Litre is available from Firestone and Camac. The 670-15 bias-ply size for the Two Point Six is available from Firestone, US Royal, Coker Classic, and Universal Vintage Tire. Brand choice is therefore tied directly to the exact size and model rather than being the same across the entire 1959 Riley range.

That gives owners some room to balance appearance, heritage, and construction style within the size their car actually uses. Firestone appears in both the radial 14-inch and bias-ply 15-inch groups, while the broadest brand spread appears in 670-15. Once the correct model and size are confirmed, comparing sidewall style and rim-width compatibility within that brand group becomes the next sensible step.

Rim-width guidance is available for some 1959 Riley sizes. The 145R14 radial used on the Riley 1.5 Litre fits 4.00- to 5.00-inch rims. The 670-15 bias-ply used on the Riley Two Point Six appears with supported rim-width ranges of 4.50 to 5.00 inches and 5.00 to 6.00 inches, depending on the specific tire. Those ranges should be treated size by size and product by product rather than blended into one universal rule for every 1959 Riley.

That matters because even within one nominal tire size, casing shape and intended wheel fit can differ. Before mounting replacement tires, measure the actual wheel or confirm it against a known factory-spec wheel for the model. If a car has aftermarket or later-service wheels, that verification becomes especially important, since the right rim diameter alone does not guarantee the ideal rim width.

Original 1959 Riley wheels can only be shared within the size family for the correct model, not across the entire year and make. The Riley 1.5 Litre's tire choices both use 14-inch rims, while the Riley Two Point Six's tire choices both use 15-inch rims. That means each model's radial and bias-ply options share the same rim diameter within that model. The 1.5 Litre and Two Point Six do not share wheel diameter with each other.

In practical terms, a sound original wheel can often remain in place when moving between radial and bias-ply options for the same model, but the wheel should still be checked for width, condition, and trueness. This is especially worthwhile on a late-1950s car that may have had wheels swapped during past repairs. Staying within the correct model-specific diameter is the first rule before comparing any other setup details.

A 1959 Riley should be stored in a cool, dry, dark place away from direct sunlight, electric motors, battery chargers, welders, and other ozone-producing equipment. Keep the tires clean and properly inflated, and move the car periodically if it sits for long stretches. Bias-ply tires such as 5.00-14 and 670-15 are especially prone to temporary flat-spotting after static storage, while radial tires such as 145R14 and 195R15 generally recover more quickly once driven.

Long storage is often harder on collector tires than regular gentle use. If the car will sit for months, many owners either roll it occasionally or support it in a way that reduces prolonged carcass loading. Good storage habits help preserve sidewall appearance, maintain a smoother return to service, and reduce the chance that a well-restored Riley feels harsh or unsettled on its first outing of the season.

On a 1959 Riley, tire age usually matters more than mileage. Collector cars often cover limited distances, so tread depth can look healthy even when the rubber has aged out. A sensible rule is to begin evaluating tires closely once they are about five to seven years old and to consider replacement as they approach roughly ten years, regardless of use. The DOT date code on the tire helps establish age, and visible cracking or hardening can shorten that timeline.

That approach is especially important on a hobby car that may spend much of its life indoors and then be asked to handle a longer drive without warning. Tires that still look attractive can lose flexibility and security over time. If a newly acquired Riley arrives on old-looking tires of uncertain age, age verification should be one of the first checks before the car returns to regular road use.

Tires on a 1959 Riley should be inspected before every drive, with a more thorough check before long outings or event travel. Look for sidewall cracking, irregular wear, cuts, bulges, weathering, and any loss of air pressure. If the car is fitted with tube-type bias-ply tires, include the valve stem area and overall air retention in your routine check. A spare tire deserves the same attention, since many collector cars still carry one for years without inspection.

Frequent inspection makes sense because a low-use classic can deteriorate quietly between drives. A Riley that has been sitting in the garage can appear ready while still hiding age-related issues that only become obvious under close inspection. Building a quick tire check into your pre-drive routine is one of the easiest ways to catch problems early and avoid spoiling a run with a preventable roadside issue.

For a 1959 Riley 1.5 Litre, bias-ply construction is the historically appropriate starting point for original-era fitment, and the 5.00-14 size aligns with that period approach. The 145R14 radial is a later-style construction choice for the same model rather than the baseline late-1950s norm. No single original-equipment brand should be assumed from the size alone, because market destination, dealer practice, and period replacement history can influence what a given car carried when new or early in life.

For restoration work, treat 5.00-14 bias-ply as the authenticity anchor and then refine from there using factory literature, surviving photos, and Riley club resources. That is particularly useful if the car is heading for concours review or a historically strict club event. If your goal is a road-driven restoration rather than a judged one, the radial alternative may still be worth considering after the original-style baseline is understood.

Correct tire fitment absolutely matters when showing a 1959 Riley, especially in events that value factory presentation and period accuracy. Judges and knowledgeable enthusiasts often notice whether the car wears the proper size family for its model, the right construction type for the era, and an appropriate sidewall style. A 1.5 Litre on a modern-looking radial may read differently from one on a numeric bias-ply, and a Two Point Six in wide whitewalls can project a very different period statement than one in blackwalls.

The level of scrutiny depends on the event. Informal local shows may reward overall presentation, while marque or concours judging can weigh tire details much more carefully. Before finalizing a show setup, compare your choice with period photography and event rules, then check with Riley specialists or club members who know how your target venue interprets authenticity for late-1950s British cars.

For the 1959 Riley Two Point Six, bias-ply construction is again the historically appropriate baseline, and 670-15 fits that original-era pattern for the larger six-cylinder car. The 195R15 radial belongs to the same model but represents a more modern construction choice rather than the typical late-1950s starting point. As with many imported British cars, original-equipment branding can vary by market and surviving records, so the safest authenticity reference is the correct size, construction type, and sidewall appearance.

Owners restoring a Two Point Six for period accuracy usually begin with the 670-15 family and then decide whether blackwall or wide whitewall best matches the car's intended presentation. If the car is being judged, period photographs and Riley specialist advice are worth consulting before settling on sidewall style. That extra step helps separate a merely fitting tire from one that truly supports the restoration story of the car.

1959 Riley tires can be suitable for highway use when they are the correct size for the model, properly mounted, correctly inflated, and in sound condition. The available 145R14 and 195R15 radial choices bring a more modern construction style, while the 5.00-14 and 670-15 options keep the traditional bias-ply format. No speed-letter markings appear in the currently available sizes here, so safe road use should be approached conservatively and in line with the car's age, setup, and overall mechanical condition.

On a late-1950s Riley, tires are only one part of the highway equation. Brake condition, steering play, suspension wear, wheel balance, and the car's own period design limits may matter more than absolute tire capability at normal cruising speeds. The smartest approach is to match the tire to the way the car will actually be used, then make sure the entire chassis is ready for the same kind of driving.

Inflation pressure for a 1959 Riley should begin with the factory recommendation for the specific model, then be checked against the tire manufacturer's rated maximum information for the exact tire you choose. Among the available products, 145R14 carries a maximum load of 880 pounds at 44 psi on one radial offering. In 670-15, load figures include 1450 pounds at 32 psi and 1550 pounds at 32 psi. Those figures describe tire capacity at stated pressure and should not be transferred across different sizes or constructions.

The practical rule is simple: use the correct model-specific factory baseline when available, and never assume that one 1959 Riley size should run the same pressure as another just because the cars are from the same year. Bias-ply and radial tires can respond differently in service, and front-to-rear pressures may also vary by vehicle setup. A careful pressure check when the tires are cold is one of the easiest ways to protect ride, handling, and tire life.

Before a longer drive in a 1959 Riley, inspect all four tires and the spare for cracking, cuts, bulges, uneven wear, and proper inflation. Confirm that the tires match the model's correct size family, and pay close attention to older bias-ply tires if the car has been sitting for a while. Check valve stems, wheel condition, and overall air retention as part of the same routine. A quick road test at low speed can also reveal vibration, pull, or flat-spotting before the trip begins.

That tire check should sit alongside a broader classic-car inspection covering brakes, fluids, cooling, steering, and lighting. A 1959 Riley rewards preparation, and small issues that are manageable near home can become much larger problems on a sustained run. Taking ten extra minutes before departure often makes the difference between a relaxed touring day and an avoidable interruption on the shoulder.