1958 Triumph Tire Fitment Guide

1958 Triumph vehicles in this fitment group use two tire sizes: 165R15 and 590-15. Both sizes apply to the TR3, TR4, and TR4A listings here, and both mount on 15-inch rims. The 165R15 radial products fit 4.50- to 6.00-inch rim widths, while the BFGoodrich 590-15 bias-ply products fit 4.00- to 4.50-inch rim widths.

That means year and make alone are not enough to settle the choice, because both sizes are tied to the same Triumph model family. The more useful next step is to confirm your actual wheel width and decide whether you want a radial-format tire or a traditional bias-ply. Once those two points are settled, the correct product list becomes much easier to narrow.

On a 1958 Triumph tire, 165R15 is a metric radial size. The 165 refers to a nominal section width of 165 millimeters, the R indicates radial construction, and the 15 is the wheel diameter in inches. In this style of older metric sizing, the lack of a written aspect ratio conventionally corresponds to an 80-series profile.

That coding matters because 165R15 is the more modern-looking size format of the two options available for 1958 Triumph sports cars. It keeps the correct 15-inch wheel diameter while moving you into a radial construction and a wider range of brand and sidewall choices. If your car is used for regular road driving, this is often the size owners investigate first.

On a 1958 Triumph tire, 590-15 is a period numeric bias-ply size. The 590 identifies the tire's nominal section-width class in the older numeric system, and the 15 identifies a 15-inch rim diameter. Unlike a modern metric radial code, it does not spell out construction with an R because this format belongs to the bias-ply era.

That makes 590-15 especially important for owners pursuing a late-1950s appearance and the driving feel associated with original-era construction. It is still a 15-inch fitment, but its required rim-width range is narrower on the BFGoodrich versions than the radial alternative. Checking the wheel before ordering is smart, especially if the car has been restored or modified over the years.

For a 1958 Triumph, the basic choice is between a radial 165R15 and a bias-ply 590-15, and both are used on the same TR-series model group. The 590-15 follows the construction style typical of the car's original period, while the 165R15 uses a later radial format in the same 15-inch wheel diameter. That makes this less of a model-fitment question and more of a use-case decision.

Owners focused on an era-correct restoration usually start with the bias-ply option, especially if sidewall appearance and original driving character matter. Owners who expect more regular street use often prefer to explore the radial size first. Either way, confirm the actual wheel width on the car, because the radial and bias-ply options do not share the same published rim-width range.

1958 Triumph tires are available in several sidewall styles depending on size. In 165R15, the offerings include blackwall, narrow whitewall, and wide whitewall. In 590-15, the available styles are blackwall and wide whitewall. That gives the radial size the broadest cosmetic range, while the bias-ply size stays closer to traditional period presentations.

For most late-1950s British sports car restorations, blackwall tends to be the safest visual direction when originality is the goal. Whitewall choices can suit a particular custom look or market taste, but they create a different appearance from the understated sporting character many Triumph owners want. If your car is shown competitively, check the event or club standard before settling on a whitewall variant.

Several brands cover 1958 Triumph fitments. The 165R15 radial size is offered by Coker Classic, American Classic, Firestone, and BFGoodrich. The 590-15 bias-ply size is available from BFGoodrich and Avon. That mix gives buyers a wider brand spread in the radial size and a smaller, more traditional range in the numeric bias-ply size.

Brand choice on a 1958 Triumph often comes down to the combination of construction type, sidewall appearance, and the exact character you want the car to project. Firestone is available only as a blackwall radial in 165R15, while BFGoodrich spans both radial and bias-ply fitments here. Avon adds another period-flavored bias-ply option for owners who want to compare within the 590-15 category.

Rim-width requirements for 1958 Triumph tires depend on the size you choose. The 165R15 radial products are matched to 4.50- to 6.00-inch rim widths. The BFGoodrich 590-15 bias-ply products are matched to 4.00- to 4.50-inch rim widths. Both sizes use 15-inch rim diameter, but they are not interchangeable across the same full rim-width spread.

That distinction is one of the most important fitment checks on a restored or driver-quality Triumph. A car that still has narrow original-style wheels may align naturally with the bias-ply range, while a car with wider 15-inch wheels may point you toward the radial size instead. Measure the wheel on the car rather than assuming it still carries the wheel specification it left the factory with.

Original 1958 Triumph wheels can potentially be used with both available tire sizes because both 165R15 and 590-15 are built for 15-inch rims. Wheel diameter compatibility is the shared starting point across the TR3, TR4, and TR4A listings here. The limiting factor is wheel width, since the radial products call for a broader published rim-width range than the BFGoodrich bias-ply products.

That means a 15-inch wheel alone is not enough to confirm interchangeability. If your Triumph still carries narrow factory-style wheels, the 590-15 may line up more closely with the wheel's proportions, while wider 15-inch wheels may better suit 165R15. The safest approach is to inspect the actual wheel before selecting between the two constructions.

A stored 1958 Triumph should be kept in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, welders, and other ozone-producing equipment that can age rubber. Keep the tires properly inflated and move the car periodically so the same contact patch is not supporting the load for months at a time. Bias-ply tires are generally more prone to temporary flat-spotting during long static storage than radials.

If the car will sit for an extended season, many collectors use tire cradles or stands to reduce stress and help preserve shape. Clean, dry floors are better than damp ground, and a breathable car cover is preferable to trapping moisture around the vehicle. Good storage habits matter just as much on a lightly used collector Triumph as tread depth or mileage.

Tires on a 1958 Triumph are usually judged more by age than by mileage, because collector cars often see limited annual use. A sensible rule is to start evaluating them closely around five to seven years of age and to treat roughly ten years as the point where replacement deserves serious consideration even if the tread still looks usable. The DOT date code on the tire helps establish its age.

That guideline is especially important on a vintage sports car because long periods of storage can harden rubber and age sidewalls without wearing the tread down. A Triumph that appears lightly used can still be riding on old tires that no longer behave as they should. If age and condition point in different directions, age should carry more weight than appearance alone.

Tires on a 1958 Triumph should be inspected before every drive, and they deserve an extra-close check before any longer outing. Look for sidewall cracking, cuts, bulges, uneven wear, embedded debris, and any sign that the tire is losing pressure between drives. A quick pressure check matters as much as a visual inspection on a car that may sit for stretches between uses.

A longer trip calls for checking the spare as well, since many vintage cars carry one that has not been examined in years. If your Triumph is running tube-type products or older wheel hardware, include the valve area in the inspection routine because slow leaks often show up there first. Catching a small issue in the garage is far easier than dealing with it on the roadside.

For a 1958 Triumph TR-series sports car, bias-ply construction is the historically appropriate starting point for original-period fitment. Among the sizes available here, 590-15 aligns with that late-1950s bias-ply tradition, while 165R15 represents a later radial-style alternative for owners who prefer a different road-going character. Original-equipment branding could vary by market and period, so size and construction are the more reliable authenticity markers.

That means a restoration aimed at factory-era presentation will usually begin with the bias-ply size before narrowing down sidewall style. If your goal is concours accuracy, confirm the expected specification with a Triumph club, period literature, or a marque specialist familiar with your market and chassis details. Small differences in export-market practice can matter when originality is being judged closely.

Correct tire fitment does matter when showing a 1958 Triumph, particularly in preservation, concours, and marque-judged settings. Judges and knowledgeable enthusiasts often notice whether the tire's size format, construction type, and sidewall appearance suit the era of the car. A radial with a conspicuous modern look or an eye-catching whitewall on a car expected to wear blackwalls can change the authenticity of the presentation.

That does not mean every shown Triumph must avoid radial tires, because judging standards vary widely between local shows, touring events, and formal concours competition. It does mean that tire choice should be treated as part of the restoration plan rather than an afterthought. If your event has a strict originality standard, get the accepted tire presentation clear before the car is finished.

Within the 590-15 fitment for a 1958 Triumph, BFGoodrich and Avon give you two different kinds of choices. BFGoodrich offers blackwall and wide whitewall versions of its Silvertown Classic Bias Ply, each listed at 1050 pounds maximum load at 32 psi, with published rim-width guidance of 4.00 to 4.50 inches. Avon appears as the Turbospeed Mk4 in 590H15 81H form, a blackwall bias-ply option carrying an H speed rating up to 130 mph.

That makes the comparison less about one being universally better and more about what matters most for your particular Triumph. If published rim-width range and whitewall availability are priorities, the BFGoodrich listings are especially useful. If you want a blackwall bias-ply with a stated H speed rating, the Avon version stands apart and is worth a closer look.

1958 Triumph tires can be suitable for highway driving when they are the correct size, in sound condition, and operated within their construction and speed limits. The available sizes here include a radial 165R15 and a bias-ply 590-15, with at least one 590-15 product carrying an H speed rating that corresponds to 130 mph. In ordinary modern traffic, the condition of the tire and the overall health of the car are often more important than chasing a theoretical top-speed figure.

A vintage Triumph's braking, suspension, steering, and alignment condition should be considered part of the tire-safety equation before a highway trip. Old shocks, loose steering components, or poor wheel balance can make even a correct tire feel unsettled. Highway use is most realistic when the whole car is sorted, the tires are properly inflated, and the driver respects the age and character of the vehicle.

Inflation pressure on 1958 Triumph tires should follow the vehicle's original specification for the application and the tire maker's rated limits for the product you choose. Among the available tires here, 165R15 products are listed around 1168 to 1170 pounds maximum load at 35 to 36 psi, while the BFGoodrich 590-15 products are listed at 1050 pounds maximum load at 32 psi. Those figures describe the tire's rated capability, not a blanket pressure setting for every Triumph.

That distinction matters because the correct operating pressure can differ from the maximum load pressure shown for the tire. Use the owner's manual or accepted factory guidance for the car as your baseline, then confirm that your chosen reproduction or replacement tire is being used within its published limits. Avoid copying a pressure figure from one size or construction type directly onto the other.

Before a longer drive in a 1958 Triumph, inspect all four road tires and the spare for cracks, cuts, bulges, punctures, uneven wear, and proper inflation. Make sure the valve stems are sound, the wheels are secure, and the tires are not old enough to raise age-related concerns even if the tread looks fine. A quick look underneath for suspension or steering issues is worthwhile on a car of this era.

Longer trips reward a broader pre-drive routine that includes brakes, fluid levels, wheel bearing condition, lights, and basic tool and jack readiness. A Triumph in good tune can be a very enjoyable touring car, but small maintenance items become big interruptions more quickly on a vintage sports car than on a modern daily driver. Tire condition should be treated as one part of that larger readiness check.