1959 Jaguar 2.4, 3.4, 3.8 & 3.8S Tires

The 1959 Jaguar 2.4, 3.4, 3.8 & 3.8S uses two primary tire sizes: 185R15 in radial construction and 640-15 in bias-ply construction. Both sizes are built for 15-inch wheels, but they represent different construction types and different approaches to the car's appearance and driving character.

Choosing between them starts with how the car is equipped and how it is meant to be used. A restoration-minded car may stay with 640-15 bias-ply tires, while a car set up for radial use may be better matched to 185R15. Wheel width, tire clearance, and any prior modifications should be checked before settling on either size.

The covered tire fitments for the 1959 Jaguar 2.4, 3.4, 3.8 & 3.8S are built around a 15-inch rim diameter. That applies to both the 185R15 radial option and the 640-15 bias-ply option, so wheel diameter stays consistent even though tire construction changes.

Rim diameter is only the first checkpoint. The available tires show different rim-width ranges depending on size and product, so it is smart to confirm the actual wheel width on the car before choosing a tire. That becomes especially important if the Jaguar has replacement wheels or if a conversion from bias-ply to radial is under consideration.

Yes. The 1959 Jaguar 2.4, 3.4, 3.8 & 3.8S Base uses the same two fitment paths as the covered model range: 185R15 as a radial option and 640-15 as a bias-ply option. There is no separate sub-model-specific tire size to sort out here.

That simplifies fitment, but it does not remove the need to confirm the car's present setup. A Jaguar that remains closer to a traditional restoration may call for the 640-15 approach, while a car already on radial-compatible wheels may be a better candidate for 185R15. Sidewall style and wheel width then become the next meaningful decisions.

640-15 is a bias-ply tire size for the 1959 Jaguar 2.4, 3.4, 3.8 & 3.8S. It uses the older numeric sizing system common to period fitments, with 6.40 representing nominal section width in inches and 15 representing the wheel diameter.

That matters because a bias-ply tire influences both the look of the car and the kind of replacement choices available. In this size, blackwall, narrow whitewall, and wide whitewall options are available, which can strongly affect restoration presentation. Before changing away from 640-15, it is wise to confirm wheel width and overall setup rather than assuming any radial alternative will behave the same.

Radial equivalents for 640-15 include 175R15 as an 80-series metric radial, P175/75R15 as a 75-series P-metric radial, and P185/70R15 as a 70-series P-metric radial. These are alternative radial size formats associated with the original 640-15 bias-ply size, not additional primary factory-style sizes.

Each option uses a slightly different sizing convention, so the choice is not just about picking any radial with a 15-inch rim diameter. A recommended rim-width range of 5 to 6 inches applies to these equivalents, and the actual wheel, tire clearance, and vehicle stance should all be reviewed before converting the Jaguar from its bias-ply fitment.

Either approach can make sense, because this Jaguar is covered by both a 640-15 bias-ply fitment and a 185R15 radial fitment. Bias-ply tires usually appeal to owners pursuing a more traditional look and period-style construction, while radial tires appeal to owners who want a later tire format that still suits the car's 15-inch wheel setup.

The better choice depends on the car's current wheels, suspension condition, and intended use. A restoration-oriented sedan shown or driven occasionally may stay bias-ply, while a regularly driven car may be evaluated around radial options. Construction changes should be treated as a full setup decision, with wheel width and body clearance checked before committing.

Start with the correct primary size and construction for the car's intended setup: 185R15 if the Jaguar is being equipped as a radial application, or 640-15 if the goal is a traditional bias-ply fitment. Both use 15-inch rims, but the available products differ in sidewall style, tire series, and sometimes recommended wheel width.

After size and construction are settled, compare the visual presentation and the practical specifications that matter to your car. Blackwall, narrow whitewall, wide whitewall, and redline choices can change the car's character noticeably. It also helps to confirm the actual wheel dimensions on the vehicle, especially if it has been restored, modified, or fitted with non-original wheels.

The available sidewall styles for this 1959 Jaguar range include blackwall, narrow whitewall, wide whitewall, and redline, depending on tire size and series. Those choices span both constructions, with radial options appearing in blackwall, narrow whitewall, and redline, while the 640-15 bias-ply offerings include blackwall, narrow whitewall, and wide whitewall versions.

Sidewall style is one of the biggest appearance decisions on a collector sedan because it changes the car's visual stance without changing wheel diameter. A wide whitewall creates a stronger vintage presentation, blackwall keeps things restrained, and redline introduces a sportier accent. The key is matching the look to the car's restoration direction rather than assuming one treatment suits every Jaguar equally.

Tire options for the 1959 Jaguar 2.4, 3.4, 3.8 & 3.8S include Coker Classic, Michelin, Avon, Universal Vintage Tire, BFGoodrich, Firestone, and Excelsior. Some of those brands appear in the radial 185R15 category, while others are represented in the 640-15 bias-ply category, so brand choice is tied closely to the size and construction being considered.

The practical way to use brand choice is as a second-step filter after confirming fitment and construction. Once the right size path is established, compare sidewall treatment, tire series, and any rim-width or load details that matter to your wheels and intended driving. That approach keeps the Jaguar's tire decision grounded in fitment instead of starting with brand preference alone.

For a period-style presentation, 640-15 bias-ply tires are the natural starting point because they retain the numeric bias-ply sizing format associated with the era. Within that size, blackwall, narrow whitewall, and wide whitewall versions are available, giving the car a traditional visual range without changing the basic vintage fitment character.

The best match depends on how strictly the restoration is being interpreted. Some owners want a subdued blackwall sedan look, while others prefer a stronger whitewall presentation. If exact originality matters beyond general period style, it is worth checking marque references or vehicle-specific history so the final sidewall and construction choice aligns with the way the individual Jaguar is being restored.

Tire construction changes more than road feel on a restored 1959 Jaguar saloon; it also changes visual character. A 640-15 bias-ply tire gives the car a more traditional period presentation, while a 185R15 radial introduces a later radial format that can still look appropriate, especially when paired with blackwall, narrow whitewall, or redline styling.

That choice should be made with the whole car in mind rather than by size alone. Wheel width, stance, and the level of restoration accuracy all influence whether bias-ply or radial looks more natural. Sidewall treatment also matters, since the same tire size can read very differently depending on whether the finished car wears blackwall, whitewall, or redline tires.

Yes. Even though the covered sizes are 185R15 and 640-15 on 15-inch rims, modifications can change what actually works on a specific 1959 Jaguar. Aftermarket wheels, altered wheel width, suspension changes, ride-height adjustments, or body repairs can all affect how much space the tire has at the fender, steering, and inner wheelhouse.

A modified car should be measured rather than assumed to match stock fitment. Checking wheel width, wheel diameter, and clearance at full steering lock is especially important before choosing between bias-ply and radial constructions or trying a radial equivalent for 640-15. That extra inspection helps avoid selecting a tire that is correct in size code but wrong for the actual setup.

Before driving, inspect the wheels, valve stems, and overall tire seating, then confirm that the tires clear the fenders and suspension through the full steering range. It also helps to look over the suspension and steering components, since worn bushings, alignment problems, or loose hardware can affect how a newly installed set of 185R15 or 640-15 tires behaves.

A collector car deserves a second walk-around after the first few miles. Recheck inflation, watch for any signs of rubbing, and make sure the car tracks evenly without unusual vibration. Cars that sit for long periods should also be checked for age-related issues elsewhere in the chassis, because tire replacement alone does not correct problems caused by long storage or deferred maintenance.

Collector-car tires should be maintained with regular pressure checks, visual inspections, and careful storage habits. Whether the Jaguar is running 640-15 bias-ply tires or 185R15 radials, the owner should watch for cracking, bulges, cuts, uneven wear, and slow air loss, especially if the car is driven only occasionally or spends long periods parked.

Storage conditions matter almost as much as mileage. Keeping the car away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve the tires between drives. It is also smart to inspect them before any longer trip, since age and inactivity can affect collector tires differently than daily-driver tires, even when tread depth still looks acceptable.