1964 Humber Hawk Tires

The 1964 Humber Hawk uses two fitment paths on a 15-inch rim: 640-15 in a bias-ply construction and 175R15 in a radial construction. Those are the two sizes tied to this exact model, and they reflect the transition-era nature of many 1960s cars that can appear with either a traditional bias-ply setup or a radial-size alternative.

Choosing between them starts with the car's current wheel and tire setup, along with the owner's goals for appearance and road use. A Humber kept in a restoration-oriented presentation may stay with 640-15, while a car evaluated around radial sizing may use 175R15. The key is confirming the actual wheel dimensions and making sure the selected tire matches the car's present configuration.

The 1964 Humber Hawk uses a 15-inch rim diameter. Both of its associated tire sizes, 640-15 and 175R15, are built around that same 15-inch wheel diameter, so the main fitment decision is not a change in wheel size but which tire construction and size format best suits the car.

That does not mean every 15-inch wheel is automatically the same in practice. Wheel width still matters, especially when considering a radial equivalent for the bias-ply size. It is worth measuring the wheel on the car and checking clearance at the fender, steering, and suspension before moving away from the existing setup, particularly if the Humber has seen wheel or suspension changes over time.

Yes. The 1964 Humber Hawk Base follows the same fitment pattern, with 640-15 bias-ply and 175R15 radial sizes associated with the model. That keeps sub-model fitment simple and makes the buying decision more about how the car is equipped and what kind of tire character the owner wants than about sorting through multiple trim-specific sizes.

Even with shared fitment, it still helps to inspect what is actually on the car before replacing anything. Collector vehicles are often updated with different wheels or converted from one construction type to another over the years. Matching the new tire to the current wheel setup and intended use is more important than assuming the car still follows the same configuration it had decades ago.

640-15 is a bias-ply tire size for the 1964 Humber Hawk. It uses the older numeric sizing system commonly seen on vintage cars, and it represents the traditional tire construction option associated with this model. Available 640-15 products for the Hawk are bias-ply tires offered in several classic series and sidewall styles.

That makes 640-15 the natural place to start when preserving a period-style appearance is a priority. Bias-ply construction also affects the way the car presents visually, especially when paired with blackwall or whitewall treatments. Before replacing tires, confirm that the wheels and the car's current setup are still intended for bias-ply sizing rather than a later radial conversion.

Radial equivalents for 640-15 include 175R15 as an 80-series metric radial, P175/75R15 as a P-metric 75-series radial, and P185/70R15 as a P-metric 70-series radial. Those three sizes offer different radial-sizing conventions while staying within the same general replacement conversation for the original 640-15 fitment.

The useful distinction is that 175R15 follows an older Euro-metric radial format, while the two P-metric choices reflect more modern sizing language. A recommended rim-width range of 5 to 6 inches is associated with these radial equivalents. Wheel width, overall tire dimensions, and vehicle clearance should still be checked carefully before selecting one for a Humber Hawk.

Start by confirming the wheel diameter and width on the car, then compare the intended radial size to the Humber's existing setup. For a Hawk moving away from 640-15 bias-ply sizing, the radial-equivalent conversation includes 175R15, P175/75R15, and P185/70R15, but those are alternatives that still need to be evaluated against the actual wheels and car.

Clearance around the fenders, steering components, and suspension deserves attention before the switch is made. It is also smart to inspect ride height, spring condition, and any prior wheel changes, since collector cars are often modified over time. A conversion should be treated as a fitment decision, not just a size-label decision, even when the wheel diameter remains 15 inches.

The main considerations are construction, sidewall presentation, brand, and how closely the tire supports the character you want for the car. On the 1964 Humber Hawk, 640-15 is the bias-ply option, and available choices include blackwall, narrow whitewall, and wide whitewall versions from BFGoodrich, Firestone, Avon, and Excelsior.

It also helps to compare the wheel-width guidance and the tire's general role in the build. A restoration-minded saloon may call for one appearance, while a more understated road car may point to another. Looking at the wheel on the car, the visual style you want, and whether the Humber is staying bias-ply or moving toward radial sizing will narrow the field quickly.

For the 1964 Humber Hawk's 640-15 bias-ply fitment, available sidewall styles include blackwall, narrow whitewall, and wide whitewall. That gives owners a meaningful appearance choice without changing the basic tire size. The sidewall treatment can shift the car's presentation from restrained and understated to more formal and period-styled.

The right choice depends on how the Hawk is being finished and how closely the tire should complement the overall restoration theme. A blackwall often keeps the look simple, while whitewall variations create a more decorative vintage profile. When originality matters at a very detailed level, it is wise to compare the selected style against marque-specific references before settling on a final look.

The 1964 Humber Hawk's 640-15 bias-ply size is available from BFGoodrich, Firestone, Avon, and Excelsior. Those brands cover several classic tire series and sidewall treatments, which gives the Hawk owner more than one route for replacing a vintage-style tire while staying within the proper basic size category.

Brand choice should be filtered through the details that matter most for the car, such as blackwall versus whitewall appearance, the tire series itself, and compatibility with the wheel on the car. It is also worth comparing load figures where they are stated, especially on a larger British saloon, rather than choosing only by brand name or sidewall look.

A period-style 1964 Humber Hawk usually starts with the 640-15 bias-ply size, because it reflects the older numeric sizing system and traditional construction associated with the car. Within that size, the available choices include blackwall, narrow whitewall, and wide whitewall versions, so the owner can shape the car's visual character without leaving the vintage fitment category.

The best match depends on the kind of restoration being pursued. Some cars benefit from a more restrained blackwall presentation, while others suit a brighter whitewall treatment. When exact historical accuracy matters beyond general period style, checking marque-club guidance, photographs, and restoration records is the sensible next step before choosing a particular sidewall treatment.

Tire construction changes more than road feel on a restored 1964 Humber Hawk; it also changes the car's visual impression. A 640-15 bias-ply tire gives the car a more traditional vintage presentation, especially when paired with blackwall or whitewall styling. A 175R15 radial takes the fitment in a more modern-looking direction, even though it keeps the same 15-inch rim diameter.

That visual difference matters on a formal British saloon where proportions and stance are a big part of the car's character. Owners aiming for a restoration-oriented look often focus on the bias-ply route first, while those prioritizing a radial setup may accept a more contemporary tire appearance. The decision should match the car's finish level and intended use rather than follow a one-size-fits-all rule.

Yes. Modifications can change tire fitment on a 1964 Humber Hawk even when the nominal size looks correct on paper. Aftermarket wheels, altered wheel width, suspension work, ride-height changes, or body repairs can all affect how a 640-15 or 175R15 tire sits in the car. That becomes especially important when evaluating a radial alternative for a car that originally uses bias-ply sizing.

A close inspection should include wheel diameter, wheel width, steering travel, and clearance at the fender and suspension. Older cars are often updated gradually over decades, so the current setup may differ from what the model originally accepted. Measuring what is actually on the Humber now is the safest way to avoid choosing a tire that only matches the original specification in theory.

Before road use, inspect basic tire condition and the surrounding chassis areas rather than focusing only on the new tires themselves. Check inflation, bead seating, valve stems, wheel condition, lug security, and any visible interference at the fenders or steering components. On a 1964 Humber Hawk, it is also smart to confirm that the selected size matches the wheel and construction type the car is actually using.

A collector car that has been parked for long periods deserves extra attention to brakes, suspension wear, and old alignment issues that can affect fresh tires quickly. A short, careful test drive followed by another visual check can reveal rubbing, unusual movement, or air loss early. That kind of inspection matters whether the Hawk is on 640-15 bias-ply tires or a 175R15 radial setup.

640-15 tires on a collector 1964 Humber Hawk should be maintained with regular pressure checks, visual inspections, and careful storage habits. Bias-ply tires on low-use vehicles deserve close attention for sidewall cracking, tread separation signs, cuts, bulges, and air loss. The wheel itself should also be kept clean and inspected, since long-stored classics can develop rim issues that affect tire service.

Storage conditions matter as much as mileage on a collector saloon. Keeping the car away from prolonged sunlight, moisture, heat, and ozone sources helps preserve the tires between drives. It is also wise to inspect them before every outing rather than assuming low annual mileage means low risk. Age and storage history can matter just as much as tread depth on a vintage car tire.