The 1973 Porsche 911 sits at a particularly interesting point in early 911 development, blending the compact, lightweight feel enthusiasts value with the more mature road manners Porsche had refined by the early 1970s. Tire choice matters because this car responds noticeably to overall size, profile, and wheel compatibility. The 1973 Porsche 911 uses radial tires in two 15-inch fitment paths: 165R15 and 185/70R15, with size differences tied to sub-model. Available choices range from traditional blackwall sport-oriented radials to whitewall alternatives that change the car’s visual character. The right selection starts with the exact sub-model, then balances authentic appearance, intended driving use, and wheel fitment.
Which Tire Size Is Right for The 1973 Porsche 911
The 1973 Porsche 911 uses two primary tire sizes, and both fit 15-inch wheels. The key step is identifying the exact sub-model, because the Base and T can use either 165R15 or 185/70R15, while the E and S use 185/70R15. Once that is confirmed, the decision shifts to tire profile, period-style appearance, and which radial product best matches the car’s intended road use.
165R15 is a Euro-metric radial size with a 165 millimeter nominal section width, radial construction, and a 15-inch rim diameter. In this sizing style, the aspect ratio is not stated in the code and is commonly understood as an 80-series type fitment. On the 1973 Porsche 911, this size supports a narrower, traditional radial presentation, with choices from Michelin, Firestone, Vredestein, Coker Classic, American Classic, and BFGoodrich in blackwall, narrow whitewall, and wide whitewall styles. It is most important to confirm the exact sub-model and wheel width before choosing among these options.
185/70R15 is a metric radial size that spells out its dimensions more directly: 185 millimeters section width, a 70-series profile, radial construction, and a 15-inch rim diameter. For the 1973 Porsche 911, it is the shared size for the E and S and also appears on the Base and T, making it the broader fitment across the range. Available products include blackwall choices from Michelin, Dunlop, and Avon, along with a wide whitewall BFGoodrich Silvertown Radial. This size is the one to evaluate when the car requires the later, lower-profile 15-inch radial fitment.
Sub-model fitment matters on the 1973 Porsche 911 because the full range does not use one universal tire size. The Base and T allow either fitment path, while the E and S narrow the decision to 185/70R15, so identifying the exact version is the first step before comparing products.
1
1973 Porsche 911 Base & T
The 1973 Porsche 911 Base & T can use either 165R15 or 185/70R15, both in radial construction on 15-inch wheels. That gives owners a genuine choice between a narrower Euro-metric look and a lower-profile metric radial, while making wheel-width confirmation especially important.
The 1973 Porsche 911 E uses 185/70R15 radial tires on 15-inch wheels. Tire selection here is more straightforward, so the focus shifts from size identification to choosing among the available blackwall or whitewall products that suit the car’s appearance and road use.
The 1973 Porsche 911 S uses 185/70R15 radial tires on 15-inch wheels. Since the size itself is settled, the real decision is which radial best fits the wheel, the desired visual presentation, and whether the car is being kept close to a period-style sporting setup.
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 Porsche 911 Tires for Sale
Available 1973 Porsche 911 tire choices center on 165R15 and 185/70R15 radials from Michelin, BFGoodrich, Firestone, Vredestein, Dunlop, Avon, Coker Classic, and American Classic. The product grid is useful for comparing blackwall, narrow whitewall, and wide whitewall styles, along with sport, touring, and restoration-oriented series.
Common 1973 Porsche 911 tire questions usually come down to sub-model fitment, 15-inch rim compatibility, selecting between 165R15 and 185/70R15, and deciding which radial style best suits restoration goals or regular road use.
Tire Size & Fitment
What tire size fits a 1973 Porsche 911?
A 1973 Porsche 911 uses two radial tire sizes: 165R15 and 185/70R15. The Base and T can use either size, while the 911 E and 911 S use 185/70R15. Both fitment paths use a 15-inch rim, so the main size question is tied to the specific sub-model rather than wheel diameter alone.
That distinction matters because the two sizes represent different profiles and visual character. A buyer looking at a Base or T should confirm the actual wheel setup on the car before choosing, especially if wheels have been changed over the years. On an E or S, the task is simpler: select the right 185/70R15 product and verify wheel width and general clearance.
What size rim does a 1973 Porsche 911 use?
The 1973 Porsche 911 uses 15-inch rims with both of its primary tire sizes. That applies whether the car is running 165R15 or 185/70R15, so the diameter remains the same even though the tire profile and width change between the two fitment paths.
Rim diameter is only the first checkpoint. Wheel width still needs to match the tire being considered, and that becomes especially important on Base and T models that may use either primary size. A car with replacement wheels should also be checked for actual wheel specifications, because an aftermarket 15-inch rim can still differ in width and affect tire choice.
Do all 1973 Porsche 911 sub-models use the same tire size?
No. The 1973 Porsche 911 range does not share one universal tire size across all sub-models. The Base and T can use 165R15 or 185/70R15, while the 911 E and 911 S use 185/70R15 only. All of these are radial tires mounted on 15-inch rims.
That means sub-model identification is a real fitment step, not just a trim detail. A Base or T owner may need to confirm whether the car is staying with its current fitment path or being returned to a more period-style setup. For an E or S, selection is more about choosing the right 185/70R15 product than sorting through multiple primary sizes.
Choosing the Right Tire
What should I consider when choosing a 1973 Porsche 911 tire?
Start with the correct primary size for the exact 1973 Porsche 911 sub-model, then narrow the choice by wheel compatibility, tire profile, and intended use. Base and T cars may use either 165R15 or 185/70R15, while the E and S use 185/70R15. All are radial fitments on 15-inch wheels.
After size is settled, compare the kind of tire that suits the car. Some owners want a blackwall sporting look, others prefer a whitewall treatment for a different restoration-style presentation. It also helps to review rim-width compatibility, load figures where shown, and whether the car is mainly driven on fair-weather roads, occasional events, or longer highway trips.
What sidewall styles are available for 1973 Porsche 911 tires?
1973 Porsche 911 tires are available in blackwall, narrow whitewall, and wide whitewall styles, depending on size and product line. The 165R15 range offers the broadest appearance choice, while 185/70R15 is more heavily centered on blackwall sport-style tires with one wide whitewall option also available.
Sidewall style changes the presentation of the car almost as much as the wheel itself. Blackwall options usually suit a more traditional Porsche sporting look, while whitewall choices create a noticeably different visual emphasis. The right decision depends on whether the goal is a restrained period-style appearance, a specific restoration theme, or simply a look that complements the car.
What brands offer tires for the 1973 Porsche 911?
Available brands for the 1973 Porsche 911 include Michelin, BFGoodrich, Firestone, Vredestein, Dunlop, Avon, Coker Classic, and American Classic. Brand spread varies by size, with 165R15 offering the widest mix and 185/70R15 concentrating more heavily on sport-oriented blackwall radial options.
Brand choice should be considered alongside size, sidewall style, series, and wheel compatibility rather than treated as the only decision point. A Michelin blackwall radial, a Vredestein classic-style radial, and a BFGoodrich whitewall may all suit the same car differently. Matching the tire to the car’s visual direction and actual road use usually leads to the best outcome.
Restoration & Appearance
Which tire should I choose for a period-style 1973 Porsche 911?
A period-style 1973 Porsche 911 tire choice starts with the correct primary size for the sub-model, then narrows to the look and character you want to preserve. 165R15 creates a traditional Euro-metric radial presentation, while 185/70R15 carries a lower-profile look used across much of the range, including the 911 E and 911 S.
Blackwall tires usually maintain the most restrained sporting appearance, while whitewall choices create a different visual statement. Exact originality can depend on market, delivery details, and restoration goals, so a buyer pursuing very precise historical accuracy should compare the tire choice against marque references or vehicle-specific documentation before deciding on sidewall style or series.
How does tire construction affect the appearance of a restored 1973 Porsche 911?
On a 1973 Porsche 911, construction is straightforward because the primary fitments are radial rather than bias-ply. Appearance is shaped less by a bias-ply-versus-radial decision and more by the difference between 165R15 and 185/70R15, along with the chosen sidewall treatment and tire series.
That makes profile and sidewall style especially important on a restoration-oriented car. A narrower 165R15 can give a more delicate early-911 visual balance, while 185/70R15 presents a broader, lower-profile stance. Whitewall versions can alter the look significantly, so they should be chosen for a deliberate restoration theme rather than assumed to be universally appropriate.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1973 Porsche 911?
Yes. A 1973 Porsche 911 may originally use 15-inch radial tires in 165R15 or 185/70R15, but modifications can change what actually works on the car. Aftermarket wheels, altered wheel widths, suspension changes, ride-height adjustments, or body modifications can all affect which tire size is practical.
That is especially important on Base and T cars because they already have two valid primary size paths. A modified car should be checked for actual wheel width, steering clearance, and fender space before selecting a tire. Even with the correct 15-inch diameter, the final choice still depends on how the car is set up today.
What should I inspect before driving a 1973 Porsche 911 on new tires?
Before driving a 1973 Porsche 911 on new tires, inspect the wheels for correct diameter and condition, confirm lug hardware and mounting surfaces, and verify that the selected tire size matches the sub-model and wheel width. It also helps to check alignment condition and look for any existing clearance issues at the fenders or suspension.
Once the tires are mounted, watch for rubbing at full steering lock and during suspension movement. Tire pressure should be set appropriately for the tire and vehicle setup, and the car should be driven gently at first to confirm that it tracks properly without vibration. Any uncertainty about wheel compatibility or clearance deserves a professional inspection before regular road use.
How should tires on a collector 1973 Porsche 911 be maintained?
Tires on a collector 1973 Porsche 911 should be inspected regularly for air loss, uneven wear, sidewall cracking, cuts, bulges, and tread condition. Because many early 911s see intermittent use, storage conditions matter almost as much as mileage. Clean, dry storage away from prolonged sunlight, heat, and ozone sources helps preserve tire condition.
Routine pressure checks are important because a car that sits can lose pressure gradually and stress the casing while parked. It is also smart to examine the tires before any longer drive, even if the tread still looks good. Age, inactivity, and storage history can affect an older collector car’s tires long before they appear worn out.
