1957 Humber Tire Fitment Guide

1957 Humber vehicles use three sizes across two models. The Humber Hawk can use either 175R15 radial tires or 640-15 bias-ply tires, while the Humber Super Snipe uses 700-15 bias-ply tires. All three sizes mount on 15-inch rims. Where rim width information is available, 640-15 products call for roughly 4.00 to 5.00-inch rims depending on the product, and 700-15 products call for 5.00 to 5.50-inch rims.

Model identification matters first, because a Hawk and a Super Snipe do not share the same tire size. After that, Hawk owners still have a second decision between radial and bias-ply construction, while Super Snipe owners stay within the 700-15 bias-ply range. Checking the actual wheel before ordering is worthwhile, especially if the car has been restored, updated, or converted from its earlier wheel and tire setup.

On a 1957 Humber, 640-15 is a numeric bias-ply size. The 6.40 portion refers to the tire's nominal section width in inches, and the 15 refers to the wheel diameter in inches. That size belongs to the Humber Hawk in this year. Available 640-15 products are bias-ply tires with whitewall styling choices, including both wide whitewall and narrow whitewall versions.

Buyers usually encounter 640-15 when they want a more period-authentic look on a Hawk rather than a later-style radial alternative. It is also important to match the tire to the wheel width, because 640-15 fitments span more than one approved rim-width range depending on the individual product. Choosing by appearance alone can lead to the wrong combination if the wheel has been changed over the years.

No. The 1957 Humber Hawk and 1957 Humber Super Snipe do not use the same tire size. The Hawk uses either 175R15 radial or 640-15 bias-ply tires, while the Super Snipe uses 700-15 bias-ply tires. They do share a 15-inch rim diameter, but the tire sizes themselves are not interchangeable choices across both models.

That distinction matters because year and make alone are not enough to choose a tire for a 1957 Humber. Owners should confirm the model first, then compare the actual wheel and the current tire markings on the car. On a Hawk, that process also helps determine whether the car is being kept in a more original-looking setup or used with a radial option that changes the driving feel.

That choice applies only to the 1957 Humber Hawk. The 175R15 is a radial size, while the 640-15 is a bias-ply size. A radial is generally the more modern construction, and a bias-ply is generally the more period-authentic construction for a 1950s British saloon. The Super Snipe does not use either of these interchangeably with the Hawk; it uses 700-15.

Hawk owners usually make this decision according to how the car will be used. A bias-ply 640-15 keeps the car visually and mechanically closer to its era, especially for traditional restoration goals. A 175R15 radial is the path for owners who want a later-style tire construction on the road. The right answer depends less on year and make alone than on the exact model and how you expect to drive it.

1957 Humber tires are available in several sidewall styles, depending on size. The 640-15 tires used on the Hawk are offered in wide whitewall and narrow whitewall form, while the 700-15 tires used on the Super Snipe are available in wide whitewall and blackwall form. Those sidewall choices let owners tune the visual character of the car without changing the basic size.

For a 1957 Humber, whitewall styling usually aligns more closely with a dressed, premium late-1950s presentation, especially on a formal saloon. Blackwall fitments can make sense for a more restrained look or for a vehicle restored to a simpler market presentation. Event standards vary, so owners building a judged car should compare sidewall style, size, and construction against marque-club expectations before committing.

BFGoodrich, Firestone, and STA all have products that fit 1957 Humber applications. In 640-15 for the Hawk, the available brands are BFGoodrich and Firestone, both in bias-ply form. In 700-15 for the Super Snipe, the available brands are Firestone, BFGoodrich, and STA, again in bias-ply form. The 175R15 radial fitment is part of the size range for the Hawk, but brand detail is not part of the available product lineup here.

Brand choice usually comes down to the combination of construction, sidewall appearance, and the exact series offered in the needed size. On a 1957 Humber, that means focusing first on whether the car is a Hawk or Super Snipe, then narrowing by whitewall or blackwall preference where those options exist. Once those decisions are made, comparing the individual tire's approved wheel width and load marking is the practical next step.

Rim-width guidance depends on the specific tire size. For 1957 Humber Hawk applications in 640-15, approved rim widths run from 4.00 to 4.50 inches on some products and 4.50 to 5.00 inches on others. For 1957 Humber Super Snipe applications in 700-15, approved rim widths are 5.00 to 5.50 inches. All of these tires share a 15-inch rim diameter, but width range still matters.

The practical lesson is that two tires with the same nominal size do not always share the exact same approved wheel-width range. A Humber owner should measure the actual wheel or confirm its specification before choosing a product, especially on a car that may have had wheels swapped during restoration. Staying inside the listed rim-width range helps preserve the tire's intended shape and load-carrying behavior.

All listed 1957 Humber sizes use 15-inch wheels, so the rim diameter is consistent across the Hawk and Super Snipe range. That means the basic wheel diameter does not create the divide between 175R15, 640-15, and 700-15. The limiting factor is model application and wheel width, with 640-15 and 700-15 products carrying different approved width ranges where that information is available.

A Hawk owner may find that two 15-inch tire choices are available, but that does not automatically mean every original wheel is equally suitable for every product. Super Snipe owners should be especially careful not to assume that a 15-inch wheel alone makes Hawk and Super Snipe tire sizes interchangeable. Diameter gets you into the right family; model fitment and wheel width finish the job.

A 1957 Humber 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. Clean, dry floors are better than damp ground, and inflation pressure should be checked periodically during storage. Bias-ply tires like 640-15 and 700-15 are especially prone to taking temporary flat spots if the car sits in one position too long.

Owners who store a 1957 Humber for long stretches should roll the car occasionally or support it in a way that reduces prolonged weight on one contact patch. If the car is fitted with a radial 175R15 on a Hawk, it will generally be less prone to classic bias-ply flat-spot feel after sitting, but all collector tires still benefit from controlled storage conditions. Proper storage protects both appearance and drivability.

Tires on a 1957 Humber should be judged more by age and condition than by mileage. Collector cars often accumulate miles slowly, so tread depth can look healthy even when the rubber is aging out. A sensible practice is to evaluate tires closely once they reach the five-to-seven-year range and to treat roughly ten years from the DOT date code as the point where replacement deserves serious consideration, regardless of use.

That timeline matters because a seldom-driven Humber can still develop hardening, cracking, and reduced grip long before the tread appears worn out. The right replacement moment depends on storage, climate, and how the car is used, but age should never be ignored just because the vehicle is a weekend or show car. Reading the tire's date code and inspecting the sidewalls regularly keeps the decision grounded in condition rather than appearance alone.

Tires on a 1957 Humber should be inspected before every drive and again before any longer outing. Check inflation, sidewall cracking, tread condition, unusual wear patterns, cuts, bulges, and signs that the car is not holding pressure evenly from one side to the other. Because these are older-vehicle applications, it is also wise to inspect the spare, and to pay close attention to valve stems whenever the car is serviced.

Regular inspection matters more on a collector car than on a daily driver because long storage intervals can hide age-related issues until the car is put back on the road. A short local drive may not reveal a weakening casing, but a sustained trip will. Making the inspection routine part of every outing helps catch problems early and gives the car a better chance of driving as intended.

For a 1957 Humber Hawk, bias-ply construction is the era-correct starting point, and 640-15 is the traditional size represented here for that model. The Hawk also has a 175R15 radial option in the fitment range, but radial construction reflects a later-style choice rather than the default period expectation for a mid-1950s British saloon. Original-equipment branding can vary by market and should not be assumed from reproduction offerings alone.

Owners restoring a Hawk for authenticity usually begin with the 640-15 bias-ply route and then refine the choice by sidewall style. A car restored for regular touring may still use the radial size if originality is not the main goal. If the vehicle is being prepared for marque judging, a Humber club or model specialist is the best resource for confirming market-specific size and sidewall expectations.

Yes, correct tire fitment matters when showing a 1957 Humber, especially in classes that emphasize factory-correct presentation. Judges and knowledgeable enthusiasts often notice whether the size, construction type, and sidewall treatment match the era and the character of the specific model. A radial on a car judged for strict originality, or a sidewall treatment that looks too modern or too flashy for the intended presentation, can stand out quickly.

The practical standard is to treat tires as part of the car's visual and historical correctness, not just as wearable service items. On a Hawk, the difference between 175R15 radial and 640-15 bias-ply can affect both stance and authenticity expectations. On a Super Snipe, choosing between blackwall and wide whitewall presentation can also shift the car's period look. Show rules vary, so event-specific guidance is worth checking before finalizing the car.

For the 1957 Humber Super Snipe in 700-15, both Firestone and BFGoodrich offer bias-ply tires with 15-inch rim diameter and a 5.00 to 5.50-inch approved rim-width range. Their listed load marking is the same at 1700 pounds at 32 psi on the products shown here. The visible difference in the available lineup is mainly sidewall presentation and series branding, with wide whitewall examples offered under both names and a Firestone blackwall also available.

That means the choice between Firestone and BFGoodrich in 700-15 is less about a dramatic specification change and more about how you want the Super Snipe to look. Buyers comparing them should focus on sidewall appearance, the exact series, and whether the product matches the car's restoration direction. Since the wheel-width and load figures align closely, presentation becomes a larger part of the decision than fitment fundamentals.

1957 Humber tires can be suitable for highway driving when they are the correct size, in sound condition, properly inflated, and matched to the car's actual wheels. The fitment range here includes both radial and bias-ply construction, which will give a different road feel, but either type must still be treated as part of an older vehicle system. On a 1950s Humber, the condition of brakes, steering, suspension, and wheel bearings can matter just as much as the tire itself at normal road speeds.

Safe highway use starts with realism about the car's age and how it is maintained. A fresh tire cannot compensate for worn front-end parts or poor alignment, and an older spare should not be assumed roadworthy without inspection. Drivers planning regular higher-speed travel often weigh construction choice carefully on a Hawk, while Super Snipe owners should focus on getting the correct 700-15 setup and the broader car ready for sustained use.

For 1957 Humber fitments shown here, several bias-ply products carry load markings at 32 psi. The 640-15 range includes examples marked 1190 pounds at 32 psi and 970 pounds at 32 psi, while 700-15 products are marked up to 1700 pounds at 32 psi. Those figures are tire ratings, not blanket vehicle-pressure instructions. The correct running pressure for the car should be checked against the Humber owner's literature and then compared with the tire manufacturer's limits for the exact product.

Pressure should never be copied from one size to another just because the wheel diameter is the same. A Hawk on 640-15 and a Super Snipe on 700-15 are carrying different tires with different load characteristics, and a Hawk on 175R15 radial is a separate case again. Setting pressure thoughtfully improves wear, steering feel, and ride quality while helping the tire carry the car as intended.

Before a longer drive in a 1957 Humber, inspect each tire for sidewall cracking, cuts, bulges, uneven wear, and proper cold inflation. Confirm that the spare is usable and that the jack and tools are in the car. Look over the wheels for visible damage and make sure the car is not showing signs of slow pressure loss. A longer outing is also the right time to confirm that the tires are centered well and that no vibration has developed.

Tires are only one part of the checklist on a car of this age, so the pre-trip inspection should extend to fluid levels, cooling system condition, brakes, steering response, and lighting as well. A Humber that feels fine around town can reveal weaknesses once heat builds on a sustained drive. Giving the tires and the rest of the chassis equal attention is the best way to enjoy the trip without unpleasant surprises.