The 1979 Jaguar XJ6 belongs to the final years of the graceful Series II sedan, a car known for blending British luxury, long-wheelbase comfort, and understated sporting character. Owners usually care as much about ride quality and visual balance as they do about outright fitment. For this exact model, the tire conversation centers on two 15-inch radial fitments: 205/70R15 in modern metric form and ER70-15 in vintage alphanumeric radial form. Available choices include blackwall, narrow whitewall, and wide whitewall presentations across several established brands and tire series. The right selection depends on whether the goal is a more contemporary radial specification, a traditional period-style look, or a restoration-oriented sidewall treatment.
Which Tire Size Is Right for The 1979 Jaguar XJ6
The 1979 Jaguar XJ6 uses two primary tire sizes, and both are radial tires for a 15-inch rim. Since both covered sub-models share these sizes, the main decision is not identifying a different trim fitment, but choosing between modern metric sizing and vintage alphanumeric radial sizing, then selecting the sidewall style, tire series, and brand that best suits the car.
205/70R15 is a metric radial size in which 205 identifies nominal section width in millimeters, 70 is the aspect ratio, R denotes radial construction, and 15 is the wheel diameter in inches. On a 1979 Jaguar XJ6, it represents a modern radial fitment that aligns with the car's 15-inch wheel setup. This size is available in several forms, including blackwall, narrow whitewall, and wide whitewall, with choices from Maxxis, Michelin, Avon, American Classic, Coker Classic, Dunlop, Tornel, and Travelstar. It is the practical choice for owners comparing appearance, rim-width compatibility, and road-going radial options within a familiar metric format.
ER70-15 is an alphanumeric radial size, where the letter code identifies the size class, the 70 indicates the profile family, and the 15 denotes a 15-inch rim. For the 1979 Jaguar XJ6, this size keeps the period-style alphanumeric convention while still using radial construction rather than bias-ply. Product offerings tied to this fitment include blackwall radial choices, including a Dunlop SP Sport Aquajet presented as an ER70-15 and 205/70VR15 application. It is especially useful for owners who want the car's tire markings and overall presentation to feel closer to the late-1970s era without stepping away from radial construction.
Tire fitment is straightforward across the covered 1979 Jaguar XJ6 sub-models because both use the same two 15-inch radial sizes. Checking the exact sub-model still matters when confirming the wheel setup and deciding whether a modern metric marking or a vintage alphanumeric radial presentation better suits the car.
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1979 Jaguar XJ6 L Sedan
The 1979 Jaguar XJ6 L Sedan uses the same pair of 15-inch radial fitments found across this application, so the tire decision centers on format and presentation rather than a different basic size. That makes it easier to choose between a modern 205/70R15, an ER70-15 style marking, or a whitewall versus blackwall appearance.
The 1979 Jaguar XJ6 L Sedan w/alloy wheels shares the same 15-inch radial tire fitments as the other covered sub-model. Selection usually comes down to confirming the actual wheel dimensions, then choosing the sidewall treatment and tire series that best match a restoration-oriented look or regular road use.
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 1979 Jaguar XJ6 Tires for Sale
Available 1979 Jaguar XJ6 tire choices center on 205/70R15 and include options from Maxxis, Michelin, Avon, American Classic, Coker Classic, Dunlop, Tornel, and Travelstar. Buyers can compare blackwall, narrow whitewall, and wide whitewall designs across several radial tire series with different rim-width and load specifications.
These 1979 Jaguar XJ6 FAQs focus on the two 15-inch radial fitments, the difference between 205/70R15 and ER70-15, available sidewall and brand choices, and the wheel, maintenance, and road-use checks worth making before driving.
Tire Size & Fitment
What tire size fits a 1979 Jaguar XJ6?
The 1979 Jaguar XJ6 uses two primary radial tire sizes: 205/70R15 and ER70-15. Both fitments are tied to a 15-inch wheel, and both covered sub-models use the same size options, including the XJ6 L Sedan and the XJ6 L Sedan w/alloy wheels.
That means the key decision is not usually sub-model separation, but whether to use the modern metric 205/70R15 format or the vintage alphanumeric ER70-15 format. Wheel width, intended appearance, and the specific tire series you prefer should all be checked before making the final choice.
What size rim does a 1979 Jaguar XJ6 use?
The 1979 Jaguar XJ6 uses a 15-inch rim with both of its primary tire sizes, 205/70R15 and ER70-15. The tire size itself confirms the wheel diameter, and the available products for this application are built around that same 15-inch fitment.
Rim diameter is only part of the picture, though, because wheel width still affects which individual tire is appropriate. Before choosing among available products, confirm the actual wheel dimensions on the car, especially if it has replacement wheels or if the alloy-wheel car no longer carries its original setup.
Do all 1979 Jaguar XJ6 sub-models use the same tire size?
Yes. The covered 1979 Jaguar XJ6 sub-models share the same two radial fitments: 205/70R15 and ER70-15. That includes the XJ6 L Sedan and the XJ6 L Sedan w/alloy wheels, so the basic tire size choice remains consistent across the listed versions.
Even with shared size fitment, the actual wheel on the car should still be verified before ordering tires. Over the years, many collector sedans have had wheel changes, and that can affect rim width, sidewall preference, and which of the available radial products makes the most sense for ride quality and appearance.
Choosing the Right Tire
What should I consider when choosing a 205/70R15 tire for a 1979 Jaguar XJ6?
Start with the correct size, 15-inch wheel compatibility, and the type of presentation you want for the car. In 205/70R15, the 1979 Jaguar XJ6 has options ranging from blackwall sport-oriented designs to narrow whitewall and wide whitewall radials that give the sedan a more traditional luxury appearance.
After that, compare the details that separate one product from another, such as rim-width range, load specification, tire series, and brand. A car kept close to period style may call for a different look than one driven regularly, so appearance and practical wheel compatibility should be weighed together.
What sidewall styles are available for 1979 Jaguar XJ6 tires?
1979 Jaguar XJ6 tires are available in several sidewall styles, including blackwall, narrow whitewall, and wide whitewall. That gives owners room to choose between a more restrained European-style look, a subtle whitewall treatment, or a fuller whitewall presentation that changes the character of the car visually.
Sidewall style affects appearance more than fitment, but it can strongly influence whether the car looks more sport-sedan oriented or more formal and restoration-minded. The best approach is to match the sidewall treatment to the way the car is trimmed, the wheel design, and the overall look you want once it is on the road.
What brands offer tires for the 1979 Jaguar XJ6?
Available tire brands for the 1979 Jaguar XJ6 include Maxxis, Michelin, Avon, American Classic, Coker Classic, Dunlop, Tornel, and Travelstar. Those choices appear primarily in 205/70R15, covering a range of blackwall, narrow whitewall, and wide whitewall radial offerings for the car's 15-inch wheel fitment.
Brand alone should not be the only deciding factor. It is better to compare each tire's sidewall style, series character, rim-width suitability, and load specification so the final choice matches both the vehicle's wheel setup and the kind of use the Jaguar will actually see.
Restoration & Appearance
Which tire should I choose for a period-style 1979 Jaguar XJ6?
A period-style 1979 Jaguar XJ6 usually points toward either an ER70-15 alphanumeric radial or a 205/70R15 tire with a traditional sidewall treatment. The alphanumeric format keeps a more vintage late-1970s look, while whitewall versions of 205/70R15 can complement the formal sedan styling in a restoration-oriented way.
The right choice depends on whether tire marking style or sidewall appearance matters more for the finished car. Owners pursuing a highly authentic presentation should compare the tire to marque references, period photos, and vehicle-specific documentation rather than assuming any available sidewall treatment was used originally.
How does tire construction affect the appearance of a restored 1979 Jaguar XJ6?
On a restored 1979 Jaguar XJ6, construction affects appearance less dramatically than it would on an earlier bias-ply-era car because both primary fitments here are radial. The more visible difference usually comes from whether the tire uses modern metric markings like 205/70R15 or vintage alphanumeric markings like ER70-15.
Sidewall treatment also plays a major role in the finished look. A blackwall keeps the presentation restrained and sporting, while narrow or wide whitewalls move the car toward a more formal, luxury-oriented appearance, so the tire should be chosen as part of the overall restoration theme rather than as an isolated part.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1979 Jaguar XJ6?
Yes. A 1979 Jaguar XJ6 may have the correct tire size on paper and still run into fitment issues if the car has aftermarket wheels, altered suspension height, or body and steering changes. Even a shared factory size like 205/70R15 or ER70-15 should be checked against the actual wheel and chassis setup.
The most important things to confirm are wheel diameter, wheel width, and clearance through full steering and suspension travel. A careful look inside the fender wells and around the front suspension is worthwhile, especially on a collector sedan that may have been modified at some point in its life.
What should I inspect before driving a 1979 Jaguar XJ6 on new tires?
Before driving a 1979 Jaguar XJ6 on new tires, inspect the wheels for damage, confirm valve-stem condition, and make sure the tire size matches the wheel setup on the car. It also helps to check alignment, suspension wear, and basic brake condition so the new tires are not asked to compensate for unrelated mechanical issues.
Once the tires are mounted, verify inflation pressure, look for even seating on the rim, and recheck clearance at the front and rear. A short initial drive followed by another quick inspection can reveal rubbing, vibration, or air loss before the car is taken on a longer run.
How should 205/70R15 tires on a collector 1979 Jaguar XJ6 be maintained?
Collector-car 205/70R15 tires on a 1979 Jaguar XJ6 should be kept properly inflated, inspected regularly for cracking, bulges, cuts, and uneven wear, and protected from long periods of sun, moisture, and ozone exposure. Low-mileage use does not stop a tire from aging, so condition matters as much as tread depth.
It is also wise to move the car periodically or manage storage carefully so the tires are not left bearing weight in one position for too long. Before any meaningful drive, check pressure and give each tire a close visual inspection, especially if the Jaguar has been parked for an extended period.
