The 1973 Triumph TR6 sits in the sweet spot of traditional British sports-car design, pairing open-top roadster character with the stronger, more mature feel that defined the TR6 through the 1970s. Owners typically want tires that preserve that classic stance without losing sight of real road use. For this exact model year, the primary fitment is a 185R15 radial on a 15-inch rim, which keeps the page focused less on multiple fitment questions and more on selecting the right version of that size. Choices include blackwall, redline, and narrow whitewall presentations across several vintage-oriented radial lines. The key is matching appearance, rim compatibility, and intended driving use to the car in front of you.
Which Tire Size Is Right for The 1973 Triumph TR6
The 1973 Triumph TR6 uses one primary tire size: 185R15, a radial fitted to a 15-inch rim. The TR6 Base shares that same fitment, so the main decision is not which primary size applies, but which version of 185R15 best suits the car's appearance, driving plans, and wheel setup.
A 185R15 size uses a 185-millimeter nominal section width, radial construction, and a 15-inch rim diameter. In this format, the aspect ratio is not written into the size, and it is commonly understood as an 80-series style radial. On a 1973 Triumph TR6, that keeps the fitment in the correct era and construction family while still giving room to choose between blackwall, redline, and narrow whitewall presentations from brands such as Michelin, Avon, Coker Classic, and Universal Vintage Tire. The practical choice comes down to the look you want and whether your wheels fall within the tire's intended rim-width range.
Fitment is straightforward across the covered 1973 Triumph TR6 sub-models. The main value in checking the sub-model is simply confirming that the car still uses the same original-size 15-inch wheel and tire setup before choosing among the available 185R15 radial options.
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1973 Triumph TR6 Base
The 1973 Triumph TR6 Base uses the same 185R15 radial fitment as the model core. That keeps tire selection centered on appearance and product choice, such as blackwall, redline, or narrow whitewall styling, rather than sorting through multiple primary sizes.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 1973 Triumph TR6 Tires for Sale
Available 185R15 choices for the 1973 Triumph TR6 include Coker Classic, Michelin, Avon, and Universal Vintage Tire options in radial construction. The main differences are tire series, sidewall style, and rim-width compatibility, with blackwall, redline, and narrow whitewall presentations all represented.
Common 1973 Triumph TR6 tire questions usually come down to understanding the 185R15 size, confirming 15-inch wheel fitment, comparing sidewall and brand options, and checking wheel, suspension, and tire condition before regular road use.
Tire Size & Fitment
What tire size fits a 1973 Triumph TR6?
The 1973 Triumph TR6 uses a 185R15 radial tire. That is the primary fitment for this model year, and the TR6 Base uses the same size, which keeps the fitment picture simple compared with vehicles that changed size by trim or package.
The important next step is confirming that the car still has the correct 15-inch wheel setup and has not been changed to an aftermarket wheel and tire package. Once the size is confirmed, selection usually comes down to sidewall appearance, brand, tire series, and whether the wheel width matches the tire's intended operating range.
What size rim does a 1973 Triumph TR6 use?
A 1973 Triumph TR6 uses a 15-inch rim with its 185R15 tire size. That 15-inch diameter is the key wheel measurement tied to the primary tire fitment, since the tire is built specifically for a 15-inch wheel.
Rim diameter should be checked first, but it should not be the only measurement you verify. Wheel width also matters when comparing specific 185R15 products, because some tires in this size are intended for slightly different rim-width ranges. A quick wheel check is especially worthwhile on a TR6 that may have seen wheel changes over time.
What does 185R15 mean on a 1973 Triumph TR6?
On a 1973 Triumph TR6, 185R15 means the tire has a nominal section width of 185 millimeters, radial construction, and a 15-inch rim diameter. The size does not spell out an aspect ratio, and in this vintage Euro-metric format it is commonly treated as an 80-series style radial.
That makes 185R15 different from older numeric bias-ply sizes and also a little different from modern metric sizing that includes the aspect ratio in the code. For a TR6 owner, the practical value is understanding that several period-style radial products can share this basic fitment while still differing in sidewall look, brand, and rim-width suitability.
Choosing the Right Tire
What should I consider when choosing a 185R15 tire for a 1973 Triumph TR6?
Start with the correct size and construction: a 185R15 radial on a 15-inch wheel. From there, the real choice is among sidewall style, brand, tire series, and wheel compatibility, since available options include blackwall, redline, and narrow whitewall versions in several vintage-oriented radial lines.
A restoration-minded TR6 may lean toward a more traditional sidewall presentation, while a driver-focused car may prioritize a particular brand or series within the same size. It also helps to compare the wheel's actual width with the tire's intended range, especially if the car has replacement wheels or a long-ago wheel change of uncertain origin.
What sidewall styles are available for 1973 Triumph TR6 tires?
The 1973 Triumph TR6 has 185R15 tire options with blackwall, redline, and narrow whitewall sidewall treatments. Those choices allow the same primary size to take on a more understated touring look, a sportier period-style presentation, or a more distinctive vintage accent depending on how the car is being finished.
Sidewall style does not change the fact that the tire still needs to match the car's wheel diameter and intended setup. It is best to choose the visual treatment after confirming size and wheel compatibility, since appearance should complement correct fitment rather than override it on a car with limited fender and steering clearance.
What brands offer tires for the 1973 Triumph TR6?
185R15 tires for the 1973 Triumph TR6 are available from Coker Classic, Michelin, Avon, and Universal Vintage Tire. Those brands cover several radial series, including Coker Classic Radial, Michelin XVS, Turbosteel CR3B, and Universal Sport, giving TR6 owners more than one period-minded direction within the same basic fitment.
Brand choice is most useful when paired with the other details that affect how the tire suits the car, such as sidewall appearance, rim-width compatibility, and the style of driving the TR6 will actually see. A buyer comparing products should focus on the complete fitment and presentation package rather than treating brand alone as the deciding factor.
Restoration & Appearance
Which tire should I choose for a period-style 1973 Triumph TR6?
A period-style 1973 Triumph TR6 starts with the correct 185R15 radial size and then moves to appearance choices within that fitment. Blackwall, redline, and narrow whitewall versions are all available, so the right tire depends on whether the car is being finished as a restrained sports car, a more personalized vintage driver, or something in between.
Construction and presentation both affect how authentic the car feels at a glance, even when the size remains the same. For owners pursuing exact originality rather than a general period-style look, the best next step is to compare the intended tire appearance with marque references, surviving original photos, and restoration records for that specific TR6.
How does tire construction affect the appearance of a restored 1973 Triumph TR6?
On a 1973 Triumph TR6, the primary fitment is already radial, so the appearance question is less about bias-ply versus radial and more about how one radial design presents itself compared with another. Sidewall treatment, shoulder shape, and overall visual character can make the same 185R15 size look more sporting, more understated, or more touring-oriented.
That matters on a restored TR6 because the tires sit in plain view and strongly influence the car's stance. A blackwall often gives a cleaner, simpler look, while redline or narrow whitewall styling creates a more deliberate vintage statement. Choosing among them works best after the car's intended finish and wheel setup are clearly defined.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1973 Triumph TR6?
Yes. A 1973 Triumph TR6 may still use the correct 185R15 tire size, but wheel changes, altered ride height, suspension work, or body modifications can affect how comfortably that size fits and operates. Even modest changes can influence steering clearance, inner-fender space, and how the tire sits on the wheel.
That is why a modified TR6 should be measured rather than assumed to match stock fitment. Checking actual wheel diameter and width is the first step, followed by a visual clearance check at full steering lock and under suspension movement. A tire that is correct in size still needs to suit the car's present-day wheel and suspension setup.
What should I inspect before driving a 1973 Triumph TR6 on new tires?
Before driving a 1973 Triumph TR6 on new tires, inspect the wheels for damage or corrosion, confirm the wheel diameter and width, and make sure the tires seat properly and hold pressure. It is also wise to check valve stems, lug hardware, brake clearance, and whether the tires have adequate room during steering movement.
A TR6 that has sat for long periods deserves extra attention to suspension bushings, shocks, steering components, and wheel bearings, since fresh tires can highlight problems that old tires masked. After installation, recheck pressure and look for any rubbing or unusual wear patterns early, before settling into normal road use.
How should 185R15 tires on a collector 1973 Triumph TR6 be maintained?
185R15 tires on a collector 1973 Triumph TR6 should be checked regularly for pressure loss, tread wear, sidewall cracking, cuts, bulges, and signs of flat spotting from long storage. Low-use sports cars often age their tires by time and storage conditions as much as by miles, so visual inspection matters just as much as tread depth.
Storage conditions also shape tire life. Keeping the TR6 away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve both appearance and condition. Routine inspection before drives, especially after the car has been parked for weeks or months, is a sensible habit for any open-top collector car running vintage-style tires.
