In 1958, Alfa Romeo stood at the intersection of sporting character and refined European engineering, building cars that appealed to enthusiasts who wanted nimble handling, advanced design, and a distinctly Italian feel. The 1958 Alfa Romeo lineup ranged from the compact Giulietta family to the larger 1900, so tire choice is not one-size-fits-all across the make. Three models are covered here, using two different radial sizes, with the practical split coming down to whether you own a 1900 on millimetric 400mm wheels or a Giulietta or Sprint on 15-inch wheels. Before choosing a tire, confirm the exact model first, then verify the wheel diameter and the product's tube-type or tubeless sidewall marking.
Which Tire Size Is Right for Your 1958 Alfa Romeo
Two tire sizes are available for 1958 Alfa Romeo vehicles, and they vary by model rather than being shared across the full range. The key decision is not bias-ply versus radial here, since both sizes are radial, but identifying whether your car uses 400mm millimetric wheels or 15-inch wheels before narrowing down product choice. Understanding that distinction first saves time and helps you match the tire to the correct Alfa Romeo model.
165R400 is a millimetric radial size with a nominal section width of 165 millimeters and a 400mm rim diameter, making it specific to the 1958 Alfa Romeo 1900 rather than universal across the year and make. Michelin offers this size in both Narrow Whitewall and Blackwall versions, and the available products are tube-type with an S speed rating, which carries a 112 mph ceiling. This is the size to choose if your 1900 still uses its proper 400mm wheel standard and you want a fitment that stays true to the car's original European tire character.
Year(s): 1958|Fit(s): Giulietta, Sprint|Construction: Radial|Rim: 15 in
155R15 is a radial metric size with a nominal section width of 155 millimeters and a 15-inch rim diameter, and on 1958 Alfa Romeo applications it is used by the Giulietta and Sprint. Firestone and Michelin products are available in Blackwall form, and tube status and speed rating vary by product: Michelin X is T-rated at 118 mph and tubeless, Michelin XAS is H-rated at 130 mph and tube-type, and Michelin XAS-FF is H-rated at 130 mph and tubeless. Buyers choosing this size should focus on the exact product character they want, since all are radial options but they differ in tube marking and speed rating within the same basic size.
Three 1958 Alfa Romeo models are covered here. Tire size varies by model, so year and make alone are not enough; the larger 1900 uses a different wheel standard from the Giulietta and Sprint. Select your model below to narrow the fitment history and tire options to the Alfa Romeo you actually own.
1958 Alfa Romeo 1900
The Alfa Romeo 1900 was the make's larger, more mature sporting sedan and coupe family, blending Italian performance with everyday usability in a way that helped broaden Alfa Romeo's appeal. Its tires mount on 400mm wheels, which places it in a different fitment category from the smaller 15-inch Giulietta-based cars.
The Giulietta was Alfa Romeo's lightweight, compact sports car and sedan family, known for lively road manners and a twin-cam character that made it one of the most beloved Italian cars of its era. Its tires fit 15-inch wheels, with radial options that suit both preservation-minded restorations and regular collector use.
Associated Tire Sizes:
155R15 — radial, period European driving character
The Sprint carried the Giulietta mechanical spirit into a sleeker coupe form, giving Alfa Romeo buyers a more stylish expression of the same compact sporting formula. Like the Giulietta, it uses 15-inch wheels, so it shares the same 155R15 radial fitment rather than the 1900's millimetric size.
Associated Tire Sizes:
155R15 — radial, period European driving character
Six products are available across two tire sizes for 1958 Alfa Romeo vehicles: 165R400 includes 2 Michelin radial choices in Narrow Whitewall or Blackwall, while 155R15 includes 4 Firestone and Michelin radial choices in Blackwall. Confirm the correct wheel diameter first, then check the individual product's tube-type or tubeless marking and speed rating where those vary within the size.
These FAQs cover the split between 400mm and 15-inch Alfa Romeo fitments, how radial choices differ within the same size, what sidewall and tube markings to check, and how to care for collector-car tires that may spend long periods parked.
Size Basics & Fitment
What tire sizes fit 1958 Alfa Romeo vehicles?
1958 Alfa Romeo vehicles use two tire sizes across three model lines. The Alfa Romeo 1900 uses 165R400, while the Alfa Romeo Giulietta and Alfa Romeo Sprint use 155R15. The 165R400 products fit 400mm rims, with listed rim-width ranges of 4.50 to 6.00 inches on one Michelin version and 6.0 to 7.0 inches on another. The 155R15 products fit 15-inch rims, with listed rim-width ranges of 4.00 to 5.50 inches where that specification appears.
That means the first thing to identify on a 1958 Alfa Romeo is the model and wheel diameter, not simply the year and make. A 1900 owner needs the millimetric 400mm fitment, while Giulietta and Sprint owners should stay within the 15-inch range. Once the correct size is established, the next choices are product style, sidewall appearance, and whether a given tire is marked tube-type or tubeless.
What does 165R400 mean on a 1958 Alfa Romeo tire?
On a 1958 Alfa Romeo, 165R400 is a millimetric radial size. The 165 refers to a nominal section width of 165 millimeters, the R indicates radial construction, and the 400 identifies a 400mm rim diameter rather than a 15-inch or 16-inch American-style wheel size. In this application, 165R400 belongs to the Alfa Romeo 1900 and is offered with an 87S service description, meaning an S speed rating with a 112 mph ceiling.
That 400mm rim diameter is the critical point, because it is easy to confuse a millimetric wheel with a nearby inch-based size if you only measure casually. A 1958 Alfa Romeo 1900 owner should verify the wheel standard before choosing a tire, especially on a restored car that may have had wheel changes over the years. If the car still retains its original-style 400mm wheels, this size keeps the fitment in the proper European pattern.
What does 155R15 mean on a 1958 Alfa Romeo tire?
On a 1958 Alfa Romeo, 155R15 is a radial metric size used on the Giulietta and Sprint. The 155 indicates a nominal section width of 155 millimeters, the R indicates radial construction, and the 15 means the tire mounts on a 15-inch rim. Some products in this size also appear as 155HR15, which adds an H speed rating; in the current range, T-rated products carry a 118 mph ceiling and H-rated products carry a 130 mph ceiling.
For a Giulietta or Sprint owner, that means the size itself is only the starting point. Within 155R15, you can still see differences in speed rating, tube marking, and product family, even though the wheel diameter remains the same. Matching the tire to how the car will be used matters more than choosing by size alone, especially if the car sees regular road miles instead of occasional show duty.
Buying the Right Tire
What sidewall styles are available for 1958 Alfa Romeo tires?
1958 Alfa Romeo tire sidewall styles vary by size. The 165R400 fitment for the Alfa Romeo 1900 is available in both Blackwall and Narrow Whitewall versions from Michelin, while the 155R15 fitment used on the Alfa Romeo Giulietta and Alfa Romeo Sprint is offered in Blackwall form. That split reflects the difference between the larger 1900's more formal presentation and the smaller sporting cars' usual European look.
For most 1958 Alfa Romeo restorations, Blackwall remains the safest visual choice when aiming for a period European appearance, especially on Giulietta and Sprint models. Narrow Whitewall on a 1900 can make sense if the car's presentation leans more upscale or touring-oriented, but sidewall style still needs to match the car's intended market image and restoration goals. Event-specific authenticity standards are best confirmed with Alfa Romeo clubs and model specialists.
What brands make tires for 1958 Alfa Romeo vehicles?
Two brands cover 1958 Alfa Romeo applications here: Michelin and Firestone. The 165R400 size for the Alfa Romeo 1900 is supplied by Michelin, while the 155R15 size used on the Alfa Romeo Giulietta and Alfa Romeo Sprint includes both Firestone and Michelin options. Within the 155R15 range, Michelin appears in Michelin X, Michelin XAS, and Michelin XAS-FF forms, while Firestone offers the F560 radial.
Brand choice on a 1958 Alfa Romeo often comes down to the character you want from the tire as much as the raw size. Michelin has especially strong period ties to European radial development, which makes it a natural fit for buyers chasing a distinctly continental feel. Firestone broadens the 155R15 selection, giving Giulietta and Sprint owners another blackwall radial option without changing the basic size.
What is the difference between Michelin X and Michelin XAS for the 1958 Alfa Romeo?
On a 1958 Alfa Romeo using 155R15, Michelin X and Michelin XAS differ in speed rating, tube marking, and listed fitment details. Michelin X is marked 155R15 82T TL, making it a tubeless T-rated radial with a 118 mph ceiling. Michelin XAS is marked 155HR15 82H TT, making it a tube-type H-rated radial with a 130 mph ceiling, and it carries a listed rim-width range of 4.00 to 5.50 inches.
That makes the choice less about nominal size and more about the exact specification that suits your car and use. Owners who want a traditional Michelin radial in a tubeless configuration may lean toward the Michelin X, while those seeking the XAS pattern and its higher H rating may prefer that route if the wheel and tube setup support it. Confirm wheel condition and valve-stem or tube requirements before deciding between them.
Fitting & Setup
What rim width do 1958 Alfa Romeo tires require?
Rim-width guidance for 1958 Alfa Romeo tires depends on the size. The 155R15 tires used on Alfa Romeo Giulietta and Sprint models are listed for 4.00 to 5.50 inch rims where a rim-width specification appears. The 165R400 tires used on the Alfa Romeo 1900 are listed in two product versions, one covering 4.50 to 6.00 inches and another covering 6.0 to 7.0 inches, so the exact tire model matters within that size.
That variation is a good reason to check the actual wheel before choosing a tire, especially on a 1900 where more than one rim-width range appears under the same millimetric size. A restoration with original wheels should be measured rather than assumed, and a car with replacement wheels needs even closer verification. Staying within the listed rim-width range helps preserve intended tire shape and behavior.
Do 1958 Alfa Romeo tires require inner tubes?
Inner-tube requirements on 1958 Alfa Romeo tires depend on the exact size and product. The available 165R400 tires for the Alfa Romeo 1900 are tube-type. In 155R15 for Alfa Romeo Giulietta and Sprint models, tube status varies by product: Michelin X is marked tubeless, Michelin XAS is marked tube-type, and Michelin XAS-FF is marked tubeless. The Firestone 155R15 listing does not carry a TT or TL marker in the size line.
That means a 1958 Alfa Romeo owner should not assume all tires within the same nominal size use the same setup. Tube-type and tubeless markings affect how the tire should be mounted and whether the wheel itself is appropriate for that configuration. On older Italian wheels, wheel condition and bead-seat design matter just as much as the sidewall marking, so it is wise to confirm both before mounting.
Maintenance, Storage & Longevity
How should I store a 1958 Alfa Romeo when the tires are fitted?
A 1958 Alfa Romeo should be stored in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, welders, and other ozone-producing equipment that can age rubber. Keep the tires properly inflated, move the car periodically if possible, and avoid letting it sit for months on damp concrete with underinflated tires. Radials generally resist flat-spotting better than old bias-ply designs, but long static storage can still harden the casing and mark the tread.
Collector cars such as a 1958 Alfa Romeo often spend more time parked than driven, so storage conditions matter as much as mileage. If the car will sit for a season, clean the tires, cover them from light, and consider moving the car occasionally or supporting it in a way that reduces prolonged loading. Good storage habits preserve both appearance and road manners when the car goes back into service.
How long do tires on a 1958 Alfa Romeo typically last?
On a 1958 Alfa Romeo, tire age is usually a more important limit than tread wear because most surviving cars are driven relatively little. A sensible rule is to begin evaluating tires closely once they are about five to seven years old and to treat around ten years as the point where replacement deserves serious consideration, regardless of remaining tread. The DOT date code on the sidewall is the reference point for age, not the date the car was restored.
That approach helps avoid a common collector-car mistake: keeping tires in service simply because they still look new from a distance. Rubber can harden, crack, or lose flexibility long before the tread appears worn out. On a 1958 Alfa Romeo used for tours or spirited road driving, age-related decline can affect ride quality, wet grip, and casing reliability well before the tire looks obviously finished.
How often should tires on a 1958 Alfa Romeo be inspected?
Tires on a 1958 Alfa Romeo should be inspected before every drive and more carefully before any extended outing. Look for sidewall cracking, cuts, bulges, irregular tread wear, and signs that the tire is losing pressure between drives. On tube-type applications such as the 165R400 fitment and some 155R15 options, the valve stem and tube-related sealing condition deserve extra attention because a problem there can mimic a tire issue.
A quick walk-around catches many age-related problems before they become road-trip problems. For a car that is only driven occasionally, inspection also helps you notice changes that developed while the car was parked rather than in active use. If vibration, pull, or steering heaviness appears after storage, check tire pressure and condition first before assuming the problem is entirely in the suspension.
Restoration & Authenticity
What tires were originally fitted to the 1958 Alfa Romeo 1900?
A 1958 Alfa Romeo 1900 would have been associated with radial European fitment in the 165R400 range rather than a modern inch-based replacement size. The currently available products in that size are Michelin radial tires, which align well with the period-correct European character of the car. Original-equipment branding could vary by market and delivery specification, so the most important authenticity point is usually the correct size, wheel standard, and construction type rather than chasing a brand assumption.
For a serious restoration, keeping the 1900 on proper 400mm wheels and the correct millimetric radial size matters because it preserves both appearance and fitment integrity. If your car has an unusual market history or coachbuilt variation, Alfa Romeo registries and marque clubs are the right place to confirm factory-delivery details. That extra step is especially worthwhile before concours judging or a high-level restoration finish.
Does correct tire fitment matter for showing a 1958 Alfa Romeo?
Correct tire fitment does matter when showing a 1958 Alfa Romeo, especially in events that emphasize factory-style presentation. Judges and knowledgeable enthusiasts will often notice whether the tire size, construction type, wheel standard, and sidewall appearance suit the model and era. A 1900 wearing a modern inch-based substitute instead of a proper 165R400, or a Giulietta wearing an obviously mismatched sidewall style, can undermine an otherwise accurate restoration.
The level of scrutiny depends on the event. A local cars-and-coffee gathering may be far less exacting than marque judging or a formal concours, where details such as blackwall versus whitewall and the correct wheel diameter can influence how authentic the car looks. If your goal is competitive originality, use the event rulebook and Alfa Romeo club guidance as the final authority before mounting tires.
What is the difference between Michelin XAS and Michelin XAS-FF for the 1958 Alfa Romeo?
For a 1958 Alfa Romeo using 155R15, Michelin XAS and Michelin XAS-FF share the same basic size, H speed rating, and listed 4.00 to 5.50 inch rim-width range, but they differ in tube marking. Michelin XAS is marked 155HR15 82H TT, while Michelin XAS-FF is marked 155HR15 82H TL. Both are blackwall radial options aimed at the same Giulietta and Sprint fitment range.
That difference matters most during a restoration or careful wheel setup, because the tire's tube designation needs to match the wheel condition and intended mounting method. A buyer comparing them for authenticity should think less about visible appearance and more about whether the car is being assembled with tube-type practice or a tubeless-compatible wheel arrangement. On a period Alfa Romeo, that setup choice can be as important as the sidewall itself.
Safety & Road Use
Are 1958 Alfa Romeo tires safe for highway driving?
1958 Alfa Romeo tires can be suitable for highway driving when they are the correct size, in sound condition, and used within their rated limits. The available 165R400 Michelin products are S-rated, which means a 112 mph ceiling, while 155R15 products include T-rated options at 118 mph and H-rated options at 130 mph. Those ratings are well above normal U.S. highway speeds, so on a properly maintained Alfa Romeo, the car's brakes, suspension, steering, and general mechanical condition are often the more immediate limits.
Safe highway use still depends on more than the speed symbol on the sidewall. A vintage Alfa Romeo should have correct pressures, no age cracking, and no hidden wheel or tube issues before being asked to cover distance at sustained speed. If the car has been dormant, a short local shakedown drive is wiser than heading straight onto the interstate.
What inflation pressure should I use for 1958 Alfa Romeo tires?
Inflation pressure on 1958 Alfa Romeo tires should be set by the vehicle's factory recommendation and the specific tire's rated capacity, not by copying a generic number from another size. One 155R15 Firestone F560 listing carries a maximum load of 1045 pounds at 44 psi. That figure is a load-and-pressure maximum for that tire, not a universal operating pressure for every 1958 Alfa Romeo or every 155R15 product.
The safest approach is to start with the Alfa Romeo owner's manual or period service guidance for the car's normal front and rear settings, then confirm that those values are appropriate for the exact reproduction tire you are using. Do not transfer a pressure figure from 155R15 to 165R400, or from one product family to another. Pressure affects ride, steering response, and tread wear, so it deserves model-specific attention.
What should I check before taking a 1958 Alfa Romeo on a longer drive?
Before taking a 1958 Alfa Romeo on a longer drive, inspect every tire for visible cracking, cuts, bulges, irregular wear, and proper inflation. Check that the spare is serviceable, and if the car uses a tube-type tire, inspect valve stems and make sure there is no slow loss of air. A longer drive is also a good time to confirm lug security, wheel condition, and that the tires are not rubbing or showing signs of age-related separation.
Tires are only one part of the pre-trip checklist on a late-1950s Italian car, but they are the part that touches the road. Pair the tire inspection with a broader check of brakes, steering, cooling, and fluid levels before leaving home. On a collector Alfa Romeo, the goal is not simply avoiding a puncture; it is making sure the entire car is ready to match the tire's capability.
