The 1955 Standard Eight comes from an era when compact postwar cars were valued for economy, simplicity, and tidy proportions rather than sheer size. For owners restoring one today or getting a surviving driver back on the road, tire choice affects both stance and character more than many buyers expect. This model uses two 13-inch fitment paths: a 520-13 bias-ply size and a 145R13 radial. That opens the door to traditional blackwall or whitewall bias-ply looks, along with a metric radial alternative in the same wheel diameter. The right choice depends on whether appearance, road feel, and period presentation matter more than moving to a later-style radial setup.
Which Tire Size Is Right for The 1955 Standard Eight
The 1955 Standard Eight uses two primary tire sizes, and both fit 13-inch rims. One is a traditional 520-13 bias-ply size, while the other is a 145R13 radial, so the first step is deciding whether the car is being kept in a period-style bias-ply presentation or set up around a radial tire. Since the same sub-model uses both sizes, the key decision is construction, tire style, and wheel compatibility rather than trim-level differences.
145R13 is a Euro-metric radial size in which 145 refers to nominal section width in millimeters, R identifies radial construction, and 13 is the wheel diameter in inches. On the 1955 Standard Eight, it represents a radial fitment path for owners who want a later-style construction while staying with a 13-inch rim. Available choices include Michelin and Firestone blackwall radials in distinct series such as Michelin XAS-FF and Firestone F560 Radial. This size is worth considering when road use and radial construction are part of the plan, but wheel width and overall vehicle setup still need to be checked.
520-13 is a numeric bias-ply size, with 5.20 indicating the nominal section width in inches and 13 identifying the wheel diameter. For the 1955 Standard Eight, this is the traditional bias-ply fitment and the size most closely tied to an authentic mid-century tire presentation. Choices in this size include Firestone and Premium Sport offerings with blackwall, narrow whitewall, and wide whitewall sidewall treatments across Firestone Classic Bias Ply and Premium Sport Lowrider series. It is the size to evaluate when maintaining a period-style look matters, while still confirming wheel width and intended use before final selection.
The covered sub-model fitment is straightforward because the 1955 Standard Eight Base uses the same two 13-inch tire-size paths. Checking the exact sub-model still matters so the buyer can focus on the real decision here, which is choosing between the bias-ply and radial fitment approaches.
1
1955 Standard Eight Base
The 1955 Standard Eight Base can be fitted with either a 520-13 bias-ply tire or a 145R13 radial, both on 13-inch rims. That means tire selection centers on desired construction, sidewall appearance, and wheel compatibility rather than hunting for a unique size tied to a different trim.
Bias-Ply to Radial Tire Conversion for the 1955 Standard Eight
The original 520-13 tire size has three radial-equivalent options. 155R13 is the 80-series metric radial equivalent, P155/75R13 is the P-metric 75-series radial alternative, and P155/70R13 is the lower-profile P-metric 70-series option. These choices keep the 13-inch wheel diameter while differing in sizing convention and profile style. A 4-5 inch rim-width range is associated with these equivalents, and final selection should still be checked against wheel width, overall dimensions, and clearance on the car.
Modern Radial Equivalents
155R13
Equivalent 80-series Metric Radial (520-13)
P155/75R13
Equivalent P-metric 75-series Radial (520-13)
P155/70R13
Equivalent P-metric 70-series Radial (520-13)
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 Standard Eight Tires for Sale
Available 1955 Standard Eight tires cover both fitment paths, with Michelin and Firestone radial choices in 145R13 and Firestone or Premium Sport bias-ply options in 520-13. The product mix gives buyers room to compare blackwall, narrow whitewall, and wide whitewall styles across distinct tire series.
These 1955 Standard Eight tire FAQs focus on the two 13-inch fitment paths, how 520-13 and 145R13 differ, what radial equivalents exist, and what to inspect before choosing tires for restoration or road use.
Tire Size & Fitment
What tire size fits a 1955 Standard Eight?
The 1955 Standard Eight uses two primary tire sizes: 520-13 in bias-ply construction and 145R13 in radial construction. Both sizes are built for 13-inch rims, so the main fitment question is not wheel diameter but which construction and sizing system matches the car’s current setup and the owner’s goals.
A buyer choosing between these sizes should confirm whether the car is being kept with a traditional bias-ply presentation or has been set up for radial tires. Wheel width, tire clearance, and overall stance should be checked before switching from one fitment path to the other, especially on a collector car that may have older wheels or past modifications.
What size rim does a 1955 Standard Eight use?
The tire sizes used on a 1955 Standard Eight are built around a 13-inch rim diameter. That applies to both the 520-13 bias-ply size and the 145R13 radial size, so either primary fitment path stays within the same basic wheel diameter.
Rim diameter is only part of the fitment picture, especially when comparing bias-ply and radial tires. The actual wheel width should also be verified, since some products in these sizes call for relatively narrow rims. That check helps avoid appearance issues, sidewall shape concerns, or clearance problems once the tires are mounted.
Does the 1955 Standard Eight Base use the same tire size?
Yes. The 1955 Standard Eight Base uses the same two tire-size paths found on this model: 520-13 as a bias-ply option and 145R13 as a radial option. There is no separate sub-model-specific size split within the covered fitment here.
That makes the decision more about tire construction and appearance than about trim-level identification. An owner can focus on whether the car should keep a period-style bias-ply look with blackwall or whitewall options, or move toward a radial setup that still uses a 13-inch rim and needs the wheel width and vehicle setup checked first.
Bias-Ply & Radial Options
Is 520-13 a bias-ply or radial tire for the 1955 Standard Eight?
520-13 is a bias-ply tire size for the 1955 Standard Eight. It uses the older numeric sizing format, and the available products in this size follow the traditional bias-ply construction that suits buyers looking for a more vintage tire appearance and presentation.
That matters because a bias-ply setup and a radial setup are not the same buying decision, even though both use 13-inch rims on this car. Someone moving away from 520-13 should compare wheel width, tire dimensions, and clearance carefully rather than assuming that any radial alternative will behave or sit exactly the same once installed.
What radial tire sizes are equivalent to 520-13?
Radial equivalents for 520-13 include 155R13, P155/75R13, and P155/70R13. Those represent an 80-series metric radial, a 75-series P-metric radial, and a 70-series P-metric radial, giving the 1955 Standard Eight several radial-format alternatives tied to the original 13-inch wheel diameter.
Each of those equivalents uses a different sizing convention and profile family, so the choice is not simply cosmetic. A 4-5 inch rim-width range is associated with the radial equivalents for 520-13, and the final match should be checked against the car’s wheel width, overall dimensions, and available clearance before making the change.
Should I use bias-ply or radial tires on a 1955 Standard Eight?
Either can be appropriate, because the 1955 Standard Eight has both a 520-13 bias-ply fitment path and a 145R13 radial fitment path. Bias-ply tires keep the car closer to a traditional period-style presentation, while radial choices give owners a way to stay with a 13-inch rim in a more modern construction.
The better choice depends on how the car will be used and how important original-era appearance is to the owner. A restoration-focused build may favor the bias-ply route, while a road-driven car may lead the buyer toward radial options. In either case, the wheel width and the actual condition of the wheels and suspension deserve a close look first.
Choosing the Right Tire
What should I consider when choosing a 520-13 tire for a 1955 Standard Eight?
Start with the fact that 520-13 is the bias-ply fitment path for the 1955 Standard Eight. Once that size is confirmed, the meaningful choices are sidewall appearance, tire series, brand, and product specifications such as rim-width compatibility or load figures where those details are available.
A blackwall bias-ply can give the car a restrained look, while narrow or wide whitewall versions change the visual character considerably. Firestone Classic Bias Ply and Premium Sport Lowrider options also differ in presentation, so the right pick depends on whether the car is being restored, shown, or simply kept as a driver with a traditional mid-century style.
What sidewall styles are available for 1955 Standard Eight tires?
The available sidewall styles for 1955 Standard Eight tires include blackwall, narrow whitewall, and wide whitewall. Blackwall appears in both the 145R13 radial choices and some 520-13 bias-ply choices, while whitewall treatments are available within the 520-13 bias-ply range.
Sidewall style has a major effect on how a small 1950s car presents visually, even when the size stays the same. A buyer should choose the sidewall treatment after confirming the correct construction path, because the radial options here are blackwall only, while the whitewall appearance choices are tied to the traditional 520-13 bias-ply fitment.
What brands offer tires for the 1955 Standard Eight?
Tires for the 1955 Standard Eight are available from Michelin, Firestone, and Premium Sport. Michelin appears in the 145R13 radial fitment, Firestone appears in both 145R13 radial and 520-13 bias-ply offerings, and Premium Sport appears in the 520-13 bias-ply range.
Brand alone should not decide the purchase, because the available tires also differ by construction, series, and sidewall treatment. A buyer comparing these options should first decide whether the car needs a radial or bias-ply setup, then narrow the selection by appearance, wheel compatibility, and any product-level details that matter for the intended use.
Restoration & Appearance
Which tire should I choose for a period-style 1955 Standard Eight?
For a period-style 1955 Standard Eight, the 520-13 bias-ply size is the natural starting point. That size keeps the car within a traditional mid-1950s tire format and is available in blackwall, narrow whitewall, and wide whitewall versions, giving the owner several ways to shape the car’s visual character.
The best appearance choice depends on the specific restoration goal rather than a universal rule. Buyers seeking a historically consistent presentation should compare tire construction and sidewall style with period photos, marque references, or other vehicle-specific documentation. That approach is especially helpful when whitewall width and visual stance matter as much as basic fitment.
How does tire construction affect the appearance of a restored 1955 Standard Eight?
Tire construction changes the look of a restored 1955 Standard Eight as well as the way the size is expressed. A 520-13 bias-ply gives the car a more traditional visual presentation, while a 145R13 radial introduces a later metric-style size and a different overall tire character even though the wheel diameter remains 13 inches.
That difference becomes more noticeable on a small 1950s car where sidewall shape and whitewall treatment draw attention quickly. Owners who prioritize a restoration-oriented appearance usually start by deciding whether the car should retain a bias-ply look, then choose the sidewall style that best suits the body color, trim, and intended period impression.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1955 Standard Eight?
Yes. Modifications can affect tire fitment on a 1955 Standard Eight even when the car still uses a 13-inch wheel. Changes such as aftermarket wheels, altered wheel width, suspension work, lowering, or body repairs can all influence how either a 520-13 bias-ply or a 145R13 radial sits on the vehicle.
Anyone working with a car that has been changed over the years should verify actual wheel dimensions and inspect steering and fender clearance before choosing tires. That matters even more when moving between bias-ply and radial constructions, since the tire may not present the same way on the wheel or within the wheel opening.
What should I inspect before driving a 1955 Standard Eight on new tires?
Before driving a 1955 Standard Eight on new tires, inspect the wheels for damage or corrosion, confirm the wheel diameter and width, and make sure the tires are mounted in the correct size and construction for the setup being used. The car should also be checked for adequate clearance at the fenders and steering stops.
A low-use collector car deserves extra attention beyond the new tires themselves. Look over suspension condition, wheel fasteners, and any signs of rubbing once the car is on the ground, then monitor tire pressure and air retention closely during the first drives. Those checks help catch setup problems before they become road-use problems.
How should 520-13 or 145R13 tires on a collector 1955 Standard Eight be maintained?
Collector-car tires in 520-13 or 145R13 should be maintained with regular pressure checks, routine visual inspections, and careful storage habits. Even on a lightly used 1955 Standard Eight, tires should be watched for cracking, bulges, cuts, irregular wear, and slow air loss, since age and inactivity can be just as important as mileage.
Storage conditions matter almost as much as road use on an older car. Keeping the Standard Eight away from prolonged sunlight, excess heat, moisture, and ozone-producing equipment can help preserve the tires between drives. It also makes sense to inspect them before any longer outing, especially if the car has spent extended time parked.
