1970 Triumph GT6 Tires

A 1970 Triumph GT6 uses two primary tire sizes: 560-13 in bias-ply construction and 155R13 in radial construction. Both sizes are associated with the GT6 Base and both use a 13-inch rim, so the main difference is the tire’s sizing system and construction rather than wheel diameter.

That means the first step is confirming how the car is currently set up. A GT6 kept in a more traditional bias-ply presentation may stay with 560-13, while a car set up around radial use may point toward 155R13. Wheel width, clearance, and any prior changes to the car should be checked before treating one fitment path as interchangeable with the other.

The 1970 Triumph GT6 uses a 13-inch rim with both of its primary tire sizes. That applies to the 560-13 bias-ply size and the 155R13 radial size, so rim diameter remains consistent even though the tire constructions differ.

Rim diameter is only part of the fitment picture, especially on a small British sports car. Bias-ply and radial products in these sizes can call for different rim-width ranges, so measuring the actual wheel matters before choosing a tire. That is especially important if the car has replacement wheels, older restorations, or changes made long ago that are easy to overlook.

Yes. The 1970 Triumph GT6 Base is associated with the same two primary sizes found on this page: 155R13 in radial construction and 560-13 in bias-ply construction. There is no separate sub-model tire-size split here that forces a different selection path.

The practical question is not trim-level variation but which construction your particular car is using now. A GT6 that already runs radial tires and radial-suitable wheels may lead you toward 155R13, while a more restoration-oriented setup may remain with 560-13. Looking at the current wheels and the overall stance of the car helps keep the next tire choice consistent with the setup already in place.

560-13 is the bias-ply tire size associated with the 1970 Triumph GT6. It uses the older numeric sizing system, where the first number refers to nominal section width and the final number identifies the 13-inch rim diameter. In this application, it is the traditional construction choice rather than the radial one.

Choosing 560-13 keeps the car in a vintage tire format, and the available products lean toward classic whitewall presentations. That makes it attractive for buyers who want a more traditional visual character. Before staying with or returning to this size, it is worth confirming wheel width and making sure the car’s current suspension, steering clearance, and driving use still suit a bias-ply setup.

Radial equivalents for 560-13 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. These are equivalent-size alternatives tied specifically to the 560-13 bias-ply fitment path.

The equivalent choices use the same basic rim-diameter family but different sizing conventions and profiles, so they should be treated as alternatives rather than automatic replacements. A recommended rim-width range of 4 to 5 inches applies to this equivalent path. Comparing the actual wheel, checking available clearance, and considering the car’s present stance are all smart steps before making the change.

Start by confirming the wheel diameter and actual wheel width, then compare the radial size you are considering against the GT6’s existing setup. For a 560-13 car, the radial-equivalent path includes 155R13, P155/75R13, and P155/70R13. The conversion question is not just about size naming, but about matching the wheel and tire combination sensibly.

A close look at steering clearance, fender clearance, suspension condition, and ride height is worthwhile before making the switch. The car may also have older replacement wheels or past modifications that change the fitment picture. Keeping all four tires in the same construction is typically the cleaner approach, and a qualified tire professional can help verify compatibility if the current setup is uncertain.

Begin with the correct primary size for the car’s present setup, because 560-13 and 155R13 represent different construction paths. The 560-13 route is bias-ply and visually traditional, while 155R13 is the radial fitment. After size and construction, the useful comparisons are brand, tire series, sidewall style, and wheel-width compatibility.

The right choice depends on how the GT6 is being used and how closely you want the tire to support the car’s visual character. A driver-focused setup may point you toward the radial path, while a restoration-oriented look may keep the car on bias-ply tires. Looking at wheel measurements and the current stance helps narrow the choice before comparing individual products.

Sidewall style depends on the size and construction you choose for a 1970 Triumph GT6. The 155R13 radial offerings are available as blackwall tires, while the 560-13 bias-ply options include narrow whitewall and wide whitewall styles. That gives the GT6 a meaningful appearance choice even before comparing brands.

A blackwall radial tends to suit a more understated sporting presentation, while whitewall bias-ply tires create a more traditional vintage look. Sidewall style should still be chosen within the correct size and wheel compatibility range rather than by appearance alone. Keeping the tire’s visual treatment aligned with the car’s overall restoration direction usually produces the most satisfying result.

Tires for the 1970 Triumph GT6 are available from Michelin, Dunlop, BFGoodrich, and Firestone. Michelin and Dunlop appear in the 155R13 radial fitment, while BFGoodrich and Firestone appear in the 560-13 bias-ply fitment. Those brands also bring different tire-series identities and sidewall presentations into the comparison.

Brand alone should not decide the purchase. It is more useful to first narrow the choice by correct size and construction, then compare the specific product’s sidewall style, tire series, and wheel-width specification. On a car like the GT6, those practical and visual details usually matter more than chasing a single name without regard to the fitment path.

For a period-style 1970 Triumph GT6, the 560-13 bias-ply fitment is the most traditional starting point because it preserves the vintage numeric sizing format and classic construction style associated with older small-car tire presentations. Available options in that size include BFGoodrich and Firestone bias-ply products with whitewall treatments.

A restoration-oriented choice still depends on how authentic or how road-oriented you want the finished car to be. Some owners prefer the appearance of a bias-ply tire, while others want a radial setup that keeps the 13-inch fitment but changes the tire type. When exact originality matters, vehicle-specific historical references and marque-club guidance are worth consulting before finalizing the look.

Tire construction changes more than just how the 1970 Triumph GT6 drives; it also changes how the car looks. A 560-13 bias-ply tire gives the car a more traditional vintage presentation, especially in narrow whitewall or wide whitewall form, while a 155R13 radial in blackwall form creates a more modernized sporting appearance.

That visual difference matters on a compact coupe with small 13-inch wheels, where sidewall character is easy to notice. Choosing construction should therefore support the overall direction of the restoration rather than being treated as a separate decision. Matching the tire’s profile, sidewall style, and wheel setup to the car’s intended era feel usually leads to a more cohesive finished result.

Yes. Modifications can change the tire-fitment picture on a 1970 Triumph GT6 even when the car remains within the same 13-inch wheel diameter. Aftermarket wheels, altered wheel widths, suspension changes, ride-height changes, or body work can all affect whether a 560-13 bias-ply or 155R13 radial setup still makes sense.

A careful check of actual wheel dimensions and tire clearance is worthwhile before selecting a replacement set. Even subtle differences in stance or wheel choice can matter on a smaller sports car. Looking at clearance through the steering range and under suspension movement helps avoid choosing a tire based only on size code without confirming how the car is configured today.

Before driving a 1970 Triumph GT6 on new tires, inspect the wheels for correct diameter and sound condition, make sure the tires are mounted in the proper size and construction, and confirm inflation is appropriate for the tire being used. It is also smart to look over the car’s suspension, steering components, and alignment condition.

A short collector-car test drive is safest when it begins with basic checks for rubbing, unusual vibration, pulling, or air loss. Tires should also be reviewed for any contact at full steering lock and over normal suspension movement. On an older sports car, the surrounding mechanical condition often matters just as much as the tire itself once the car goes back on the road.

Collector-car tires on a 1970 Triumph GT6 should be maintained with regular pressure checks, routine visual inspections, and attention to age-related condition even if the car is driven only occasionally. Whether the car uses 560-13 bias-ply tires or 155R13 radials, watch for cracking, bulges, cuts, uneven wear, or persistent air loss.

Storage conditions matter on a low-use GT6 because long idle periods can be harder on tires than steady use. Keeping the car away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve the tire over time. A quick inspection before each outing, plus a more thorough check before a longer drive, is a sensible routine for an older collector vehicle.