1961 Triumph Herald Tires

A 1961 Triumph Herald uses two primary tire sizes: 520-13 in bias-ply construction and 145R13 in radial construction. Both are 13-inch fitments, but they represent different sizing systems and different tire constructions, so the choice is not just a matter of reading the wheel diameter.

The practical step is confirming what is on the car now and what type of driving or presentation is desired. A Herald kept in a more period-style configuration may stay with 520-13, while a car already running radial-format tires may use 145R13. Wheel width, clearance, and the car's present setup should be checked before changing formats.

The 1961 Triumph Herald uses a 13-inch rim diameter with both of its primary tire sizes. That applies whether the car is fitted with a 520-13 bias-ply tire or a 145R13 radial, so the wheel diameter remains consistent even though the tire construction and sizing system can differ.

Rim diameter alone does not settle the full fitment question. The buyer should still verify actual wheel width and the tire format already on the vehicle, especially if the car has been updated over time. A 13-inch wheel can still require a different tire choice depending on whether the goal is to retain bias-ply character or run a radial-style setup.

On a 1961 Triumph Herald, 520-13 is a numeric bias-ply tire size. The 5.20 refers to the nominal section width in inches, written without a decimal in the code, and the 13 identifies the wheel diameter. It is an older sizing format commonly seen on small vintage cars and earlier tire constructions.

Understanding that code helps separate a traditional bias-ply fitment from a later-style radial alternative such as 145R13. A buyer considering 520-13 should look beyond the size itself and decide on the desired appearance, sidewall style, and use of the car. Whitewall and blackwall choices can change the look substantially while staying within the same basic fitment.

For the 1961 Triumph Herald, 520-13 is a bias-ply tire size. It uses the older numeric sizing convention and is available in bias-ply product lines with blackwall, narrow whitewall, and wide whitewall presentations, making it the traditional-format choice for this vehicle.

That matters because a bias-ply Herald and a radial-equipped Herald can feel and present differently. Owners choosing 520-13 are usually prioritizing vintage construction and appearance, while a change to radial sizing should be approached as a separate fitment decision. Before switching, check wheel width, overall tire dimensions, and clearance rather than assuming every 13-inch setup behaves the same.

Radial equivalents for 520-13 include 155R13 as the 80-series metric radial option, P155/75R13 as the P-metric 75-series radial option, and P155/70R13 as the P-metric 70-series radial option. Those three sizes give the 1961 Triumph Herald owner several radial-format alternatives to compare against the original-style bias-ply size.

Each equivalent follows a different sizing convention, so the decision is about more than simply choosing any radial with a 13-inch rim diameter. The recommended rim width range for these equivalents is 4-5 inches, and the car should be checked for wheel compatibility and clearance. That is especially important on a lightly modified Herald or one that no longer retains its original wheel setup.

Either can make sense on a 1961 Triumph Herald because both 520-13 bias-ply and 145R13 radial fitments are part of the vehicle's tire picture. The better choice depends on what matters most: a more traditional period-style presentation, or a radial-format tire that aligns with a later-style setup on the same 13-inch wheel diameter.

A restoration-oriented car often leans toward the bias-ply size because construction and sidewall treatment shape the overall look. A driver-focused Herald may lead the owner toward a radial or one of the radial equivalents tied to 520-13. Either way, confirm wheel width, tire dimensions, and clearance before making the change, especially if the suspension or wheels have been altered over time.

Start with the fact that 520-13 is the Herald's bias-ply option, so the choice is really about construction and presentation as much as size. Available 520-13 tires include blackwall, narrow whitewall, and wide whitewall designs from Firestone and Premium Sport, which means appearance can vary quite a bit even within the same fitment.

After the size is settled, compare the tire series and the wheel requirements tied to each product. Some 520-13 options call for 3.5-inch rims, while others are intended for 3.50-4.00-inch widths. A buyer restoring a small British car may focus on sidewall style first, but the wheel width and the actual setup on the car should still guide the final selection.

The 1961 Triumph Herald has several sidewall treatments available depending on size and construction. In 145R13 radial form, the available products are blackwall. In 520-13 bias-ply form, the choices expand to blackwall, narrow whitewall, and wide whitewall, giving the car a much broader range of vintage visual character.

That sidewall choice can change the personality of the car more than many buyers expect. Blackwall keeps the look understated and simple, while whitewall treatments add more visual presence on a compact early-1960s body. Appearance should be matched to the overall restoration direction, but the buyer should still verify that the preferred sidewall style is available in the intended construction and wheel fitment.

Michelin, Firestone, and Premium Sport all offer tire choices for the 1961 Triumph Herald. Michelin and Firestone appear in the 145R13 radial size, while Firestone and Premium Sport supply 520-13 bias-ply options. That gives the Herald owner brand variety across both construction types rather than within just one narrow fitment path.

The useful way to compare those brands is by the size, construction, series, and sidewall presentation each one offers. A buyer looking at Michelin XAS-FF or Firestone F560 Radial is making a different decision than someone choosing among Firestone Classic Bias Ply or Premium Sport Lowrider options in 520-13. Matching brand choice to the car's intended look and setup is more useful than chasing a one-name answer.

For a period-style 1961 Triumph Herald, the 520-13 bias-ply size is the natural starting point because it retains the older numeric sizing format and a traditional construction. That does not automatically make every 520-13 option exactly right for every restoration, but it puts the buyer in the correct visual neighborhood for an early-1960s small British car.

The next decision is sidewall presentation. A blackwall keeps the car restrained, while narrow or wide whitewall choices shift the look in a more decorative direction. If originality matters at a high level, compare the tire style against marque references, period photos, or restoration documentation for the specific car. That keeps appearance decisions grounded rather than based only on what is available in the size.

Tire construction changes the look of a restored 1961 Triumph Herald because bias-ply and radial tires present the car differently even when both fit a 13-inch rim. A 520-13 bias-ply usually supports a more traditional small-car stance and vintage visual character, while a 145R13 radial brings in a later-style metric format and a more modern-looking tire designation.

That difference matters on a car as visually delicate as the Herald, where tire profile and sidewall treatment are easy to notice. Buyers focused on restoration often start with construction first, then sidewall style second. The best result usually comes from viewing the tire as part of the whole car's presentation rather than treating the size alone as the only restoration decision.

Yes, modifications can affect tire fitment on a 1961 Triumph Herald even though the primary sizes use the same 13-inch rim diameter. Changes such as aftermarket wheels, altered wheel width, suspension work, or body modifications can influence how either a 520-13 bias-ply or a 145R13 radial sits on the car and clears surrounding components.

That is especially important when considering a radial equivalent for 520-13 or when moving from one construction type to the other. The buyer should verify actual wheel width, inspect steering and fender clearance, and confirm that the car sits as expected at ride height. Small vintage cars can be sensitive to setup changes, so assumptions based only on size markings are best avoided.

Before driving a 1961 Triumph Herald on new tires, inspect the wheels for correct diameter and condition, confirm the tires are seated properly, and check pressure carefully. It also makes sense to look over the suspension and steering components, since an older British car can reveal wear more quickly once fresh tires are installed.

A short, cautious road test is a smart next step. Listen for rubbing, check straight-line behavior, and recheck pressure after the first drive. On a car that has sat for long periods, also inspect for old wheel issues, loose hardware, or alignment concerns. New tires can only perform as intended when the surrounding chassis and wheel condition are ready for road use.

Collector-car tires on a 1961 Triumph Herald should be maintained with regular pressure checks, visual inspections, and attention to age-related deterioration. Whether the car is on 520-13 bias-ply tires or 145R13 radials, owners should watch for cracking, bulges, cuts, uneven tread wear, and slow air loss that may not be obvious on a lightly used vintage car.

Storage conditions matter as much as mileage on a collector vehicle. Keeping the Herald away from prolonged sunlight, heat, moisture, and ozone sources helps protect the tire casing and sidewalls. It is also wise to inspect the tires before every meaningful drive rather than assuming low annual mileage means low risk. Vintage cars often age their tires out long before they wear them out.