The 1955 Austin-Healey 100 sits squarely in the postwar British sports-car world, where light weight, open-air motoring, and direct road feel mattered as much as outright speed. For many owners, tire choice is part of preserving that character while matching the car’s exact configuration. This Austin-Healey uses 15-inch tires, but fitment changes by sub-model, with the Base tied to 590-15 bias-ply or 165R15 radial choices and the 100 S using 550-15 bias-ply or 155R15 radial alternatives. Available options range from traditional blackwalls and whitewalls to more modern radial series. The right selection depends on whether appearance, driving feel, or careful restoration-minded fitment takes priority.
Which Tire Size Is Right for The 1955 Austin-Healey 100
The 1955 Austin-Healey 100 uses four primary tire sizes across its covered configurations, and the first step is identifying whether the car is a Base model or a 100 S. All four sizes mount on 15-inch rims, but the fitment differs by sub-model and by construction, with both bias-ply and radial options represented. Once the sub-model is confirmed, the real decision becomes whether to stay with the traditional construction or consider the radial size associated with that configuration.
165R15 is a Euro-metric radial size in which 165 refers to nominal section width in millimeters, R identifies radial construction, and 15 is the rim diameter in inches. On the 1955 Austin-Healey 100, this size is the radial fitment associated with the Base model and gives buyers a modern radial format while staying with the correct 15-inch wheel diameter. Choices include blackwall, narrow whitewall, and wide whitewall tires from brands such as Coker Classic, American Classic, Firestone, BFGoodrich, Michelin, and Vredestein. It is a useful size to evaluate when road use and tire-series selection matter as much as period-style presentation.
590-15 is a numeric bias-ply size where 590 represents a nominal 5.90-inch section-width class and 15 indicates the wheel diameter. For the 1955 Austin-Healey 100, this is the bias-ply fitment tied to the Base model and suits buyers who want the traditional construction associated with mid-1950s sports-car tire presentation. Available choices include blackwall and wide whitewall versions, along with tire-series options such as Silvertown Classic Bias Ply and Turbospeed Mk4. This size is worth considering when the goal is to retain a more original-era look and construction style on the proper 15-inch wheel.
155R15 is a Euro-metric radial size, with 155 indicating nominal section width in millimeters, R for radial construction, and 15 for the rim diameter. On the 1955 Austin-Healey 100, this size is the radial fitment associated with the 100 S and keeps the car in a 15-inch radial format suited to that sub-model. Product choices center on blackwall designs from Firestone, Michelin, Avon, and Vredestein across several radial series. It is the size to review when the car is a 100 S and the owner wants radial construction while keeping the fitment aligned with that specific configuration.
550-15 is a numeric bias-ply size in which 550 points to a nominal 5.50-inch section-width class and 15 designates the wheel diameter. For the 1955 Austin-Healey 100, this is the bias-ply fitment connected to the 100 S, making it the traditional-construction choice for that sub-model. The available product is a blackwall Excelsior bias-ply tire, which keeps the selection focused on classic sizing and appearance rather than a wide range of sidewall treatments. This size deserves close attention when maintaining a period-style setup and confirming the wheel is suited to a narrower bias-ply fitment.
Sub-model identification matters on the 1955 Austin-Healey 100 because the Base and 100 S do not share the same primary tire sizes. Both use 15-inch rims, but each sub-model has its own bias-ply and radial fitment path, so the tire decision starts with confirming the exact version of the car.
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1955 Austin-Healey 100 Base
The 1955 Austin-Healey 100 Base uses 590-15 in bias-ply form or 165R15 in radial form, both on 15-inch rims. That gives the Base owner a choice between traditional construction and a modern radial format, with sidewall and tire-series differences shaping the final selection.
The 1955 Austin-Healey 100 S uses a narrower fitment path, pairing 550-15 for bias-ply applications with 155R15 for radial use on 15-inch wheels. Tire selection here depends on whether the goal is a restoration-oriented bias-ply presentation or a radial setup matched to the 100 S configuration.
Bias-Ply to Radial Tire Conversion for the 1955 Austin-Healey 100
The 1955 Austin-Healey 100 has radial-equivalent options for both of its bias-ply primary sizes. For 590-15, the available equivalents are 165R15 as an 80-series metric radial, P165/75R15 as a 75-series P-metric radial, and P175/70R15 as a 70-series P-metric radial. For 550-15, the equivalents are 155R15 as an 80-series metric radial and 560R15 as a bias-look radial. The range moves from traditional metric radials to lower-profile P-metric alternatives, with a 4-5 inch recommended rim-width range; wheel size, wheel width, and clearance should still be checked before any change.
Modern Radial Equivalents
165R15
Equivalent 80-series Metric Radial (590-15)
P165/75R15
Equivalent P-metric 75-series Radial (590-15)
P175/70R15
Equivalent P-metric 70-series Radial (590-15)
155R15
Equivalent 80-series Metric Radial (550-15)
560R15
Bias-look Radial Equivalent (550-15)
Important Considerations When Replacing Bias Ply With Radial
Compare overall diameter and section width carefully to ensure proper fit.
Verify recommended rim range (4-5 in) and load needs match your vehicle specifications.
Check fender clearance, steering clearance, and stance before installation.
Consider suspension condition and intended road use when choosing equivalents.
Important Fitment Notes
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 1955 Austin-Healey 100 Tires for Sale
Available 15-inch choices for the 1955 Austin-Healey 100 span bias-ply and radial construction, with brands including BFGoodrich, Michelin, Firestone, Avon, Vredestein, Coker Classic, American Classic, and Excelsior. Buyers can compare blackwall, narrow whitewall, and wide whitewall presentations along with distinct tire series and rim-width requirements.
These FAQs focus on the exact tire sizes used on the 1955 Austin-Healey 100, how fitment changes between the Base and 100 S, and what to review when comparing bias-ply, radial, sidewall, and road-use considerations.
Tire Size & Fitment
What tire size fits a 1955 Austin-Healey 100?
A 1955 Austin-Healey 100 can use 165R15, 590-15, 155R15, or 550-15, depending on the sub-model and whether the car is set up with radial or bias-ply tires. The Base model uses 165R15 radial or 590-15 bias-ply, while the 100 S uses 155R15 radial or 550-15 bias-ply.
The key is matching the tire size to the exact version of the car rather than assuming every 1955 Austin-Healey 100 uses the same tire. Once the sub-model is confirmed, check the wheel width and overall vehicle setup before choosing between the proper bias-ply size and the radial size associated with that configuration.
What size rim does a 1955 Austin-Healey 100 use?
The 1955 Austin-Healey 100 uses a 15-inch rim across all of its covered tire sizes. That includes the Base model’s 590-15 and 165R15 fitments as well as the 100 S fitments in 550-15 and 155R15.
Knowing the rim diameter narrows the search quickly, but it is only part of the fitment picture. Wheel width still matters, especially when comparing a narrow bias-ply tire with a radial alternative, so the actual wheel on the car should be checked before settling on a specific product or construction.
Do all 1955 Austin-Healey 100 sub-models use the same tire size?
No. The 1955 Austin-Healey 100 Base and 100 S use different tire sizes even though both use 15-inch rims. The Base uses 590-15 in bias-ply form or 165R15 in radial form, while the 100 S uses 550-15 bias-ply or 155R15 radial.
That difference makes sub-model confirmation the first step in choosing tires for this car. A buyer who starts with the wrong sub-model can end up comparing the wrong width, the wrong construction path, or the wrong group of available products, even though the wheel diameter appears the same.
Bias-Ply & Radial Options
Is 590-15 a bias-ply or radial tire for the 1955 Austin-Healey 100?
590-15 is a bias-ply tire size on the 1955 Austin-Healey 100, and it belongs to the Base model fitment path. Its radial equivalents are handled separately rather than treated as the same construction, so 590-15 itself remains the traditional numeric bias-ply option.
That matters because the driving character, appearance, and wheel-width needs of a bias-ply setup can differ from those of a radial alternative. Anyone moving away from 590-15 should verify the actual wheel width, compare the intended replacement size carefully, and make sure steering and body clearance remain appropriate for the car’s setup.
What radial tire sizes are equivalent to 590-15?
Radial equivalents for 590-15 include 165R15 as an 80-series metric radial, P165/75R15 as a 75-series P-metric radial, and P175/70R15 as a 70-series P-metric radial. These sizes give the 1955 Austin-Healey 100 Base owner several radial-format alternatives to compare against the original bias-ply sizing path.
Each option uses a different sizing convention, so the choice is not just about moving from bias-ply to radial. A 4-5 inch recommended rim-width range applies here, and the final decision should include wheel width, overall vehicle clearance, and whether the goal is a traditional look or a more modern radial presentation.
Can I use a bias-look radial on a 1955 Austin-Healey 100?
Yes, but only where that equivalent exists for the car’s primary bias-ply size. On the 1955 Austin-Healey 100, a bias-look radial equivalent is available for 550-15 in the form of 560R15, which relates to the 100 S fitment path rather than the Base model’s 590-15 size.
A bias-look radial can appeal to an owner who wants radial construction without losing the traditional visual character of an older sports car. The wheel and car still need to be checked carefully, because a bias-look radial is an alternative format, not an automatic interchange, and the 100 S should be verified before selection.
Choosing the Right Tire
What should I consider when choosing a tire for a 1955 Austin-Healey 100?
Start with the exact sub-model, because the 1955 Austin-Healey 100 Base and 100 S use different primary sizes. After that, decide whether the goal is to keep the car on its traditional bias-ply size or use the radial size associated with that configuration, since both construction and size affect the available choices.
Once the fitment path is clear, compare wheel-width compatibility, sidewall presentation, brand, and tire series. A restoration-minded owner may lean toward the bias-ply route, while a driver-focused owner may prefer the radial offering tied to the same sub-model, but either choice should be checked against the actual wheel and vehicle setup.
What sidewall styles are available for 1955 Austin-Healey 100 tires?
Sidewall choice depends on the tire size. Across the 1955 Austin-Healey 100 range, available sidewall styles include blackwall, narrow whitewall, and wide whitewall. The broadest appearance variety appears in 165R15, while 155R15 and 550-15 stay focused on blackwall offerings and 590-15 includes blackwall and wide whitewall options.
That makes sidewall style part of the selection process, not just a cosmetic afterthought. A whitewall can create a more decorative mid-century presentation, while a blackwall usually gives a more restrained sports-car look, so the final choice should support the car’s intended appearance without losing sight of the correct sub-model fitment.
What brands offer tires for the 1955 Austin-Healey 100?
Tires for the 1955 Austin-Healey 100 are available from Coker Classic, American Classic, Firestone, BFGoodrich, Michelin, Vredestein, Avon, and Excelsior. Brand availability changes by size, with the widest selection appearing in the radial sizes and a narrower choice set in the smaller bias-ply and 100 S-specific fitments.
Brand matters mainly as part of a larger comparison that includes size, construction, sidewall style, and tire series. Instead of choosing by name alone, it helps to narrow the search to the correct sub-model fitment first, then compare the brands that actually offer the appearance and specification range suited to that setup.
Restoration & Appearance
Which tire should I choose for a period-style 1955 Austin-Healey 100?
For a period-style 1955 Austin-Healey 100, the bias-ply path is usually the natural starting point: 590-15 for the Base model and 550-15 for the 100 S. Those sizes keep the car in a traditional mid-1950s tire format, while the radial options move the presentation toward a later construction style.
Appearance goals still need to be tied to the exact sub-model and the wheel actually on the car. If historical accuracy is especially important, compare the chosen size and sidewall treatment against marque references or restoration documentation, since period-style and exact as-delivered specification are not always the same thing.
How does tire construction affect the appearance of a restored 1955 Austin-Healey 100?
Tire construction changes more than ride feel on a restored 1955 Austin-Healey 100; it also changes the car’s visual character. Bias-ply tires usually maintain the more traditional look associated with a 1950s sports car, while radial options in 165R15 or 155R15 give the car a more modern replacement style on the same 15-inch rim diameter.
Sidewall treatment then refines that appearance further, especially where blackwall, narrow whitewall, or wide whitewall choices exist. The best visual result comes from matching construction, size, and sidewall style to the car’s restoration goal rather than choosing a tire only by brand or by the broad appeal of radial construction.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1955 Austin-Healey 100?
Yes. Modifications can change tire fitment on a 1955 Austin-Healey 100 even when the wheel still measures 15 inches. Aftermarket wheels, different wheel widths, suspension changes, steering adjustments, or body alterations can all affect how a 590-15, 550-15, 165R15, or 155R15 sits and clears the car.
That is especially important when comparing bias-ply and radial choices, since the construction change may bring different wheel-width needs within the same diameter. A modified car should be measured at the wheel and checked at full steering lock and suspension movement before treating any listed size as suitable for the current setup.
What should I inspect before driving a 1955 Austin-Healey 100 on new tires?
Before driving a 1955 Austin-Healey 100 on new tires, inspect the wheels, valve stems, lug hardware, and overall wheel condition, then confirm that the chosen tire size matches the car’s exact sub-model. It also helps to check that the tires are seated properly and inflated to the pressure appropriate for that tire and wheel setup.
A short, careful road test is the next practical step. Pay attention to any rubbing, unusual steering feel, vibration, or uneven clearance, especially if the car has older suspension parts or non-original wheels, because a fresh set of tires can reveal fitment or chassis issues that were less obvious before.
How should tires on a collector 1955 Austin-Healey 100 be maintained?
Tires on a collector 1955 Austin-Healey 100 should be checked regularly for pressure, cracking, cuts, bulges, tread wear, and signs of slow air loss, even if the car is driven only occasionally. Low-use sports cars often spend long periods parked, so condition matters just as much as mileage on both bias-ply and radial tires.
Storage habits have a major effect on tire life. Keeping the car away from prolonged sunlight, moisture, excessive heat, and ozone sources helps preserve the rubber, and moving the car periodically can reduce flat-spotting during long sits. Any tire showing age-related deterioration deserves close evaluation before the next road outing.
