1991 Lamborghini Tire Fitment Guide

1991 Lamborghini vehicles use two tire sizes, and both apply to the Diablo: 245/40R17 and 335/35R17. Both are radial tires built for 17-inch rims, but they are not interchangeable because they serve different positions in the car’s staggered setup. The 245/40R17 fits wheels in an 7.0 to 9.5-inch range depending on the specific tire, while the 335/35R17 fits wheels from 11.0 to 13.0 inches.

That means a 1991 Lamborghini owner should start by confirming whether the tire needed is for the front or rear axle. The shared 17-inch rim diameter can make the pair sound similar at first glance, but the width difference is substantial and directly affects wheel compatibility. Treat the 245/40R17 as the front fitment and the 335/35R17 as the rear fitment unless a specialty wheel package has changed the car from factory-style sizing.

On a 1991 Lamborghini, 245/40R17 identifies a metric radial tire with a nominal section width of 245 millimeters, a 40-series aspect ratio, and a 17-inch wheel diameter. The R indicates radial construction, which is standard for the Diablo sizes covered here. Within this size, available products carry speed ratings that include W, rated to 168 mph, and Y, rated for 186+ mph service.

For a Diablo owner, that code matters because it describes the front tire’s physical proportions and wheel fitment range, not just a generic performance category. It also helps separate one 245/40R17 product from another when comparing speed capability and wheel-width compatibility. If your car is driven regularly, verify the wheel width and then compare the specific product’s speed marking rather than assuming every 245/40R17 behaves the same way.

On a 1991 Lamborghini, 335/35R17 identifies a very wide metric radial tire with a nominal section width of 335 millimeters, a 35-series aspect ratio, and a 17-inch wheel diameter. The R confirms radial construction, and the ZR-style marking used in available products reflects a high-speed service category associated with exotic-car fitments of the period. This is the wider rear size used on the Diablo.

That code is especially important on a supercar because a rear tire this wide has a much different wheel requirement than the front size. A 335/35R17 belongs on a wheel in the 11.0 to 13.0-inch range, so it is not simply a larger version of the front tire. If you are replacing only two tires, check the car carefully so the rear pair stays matched in size, construction, and overall intended use.

1991 Lamborghini Diablo tires in both 245/40R17 and 335/35R17 are available as Blackwall radials. That sidewall treatment suits the Diablo well because early-1990s Lamborghini supercars were designed around contemporary high-performance tire styling rather than whitewall or vintage sidewall treatments. The visual emphasis stays on the car’s wide stance, large wheel openings, and low-profile proportions.

For most Diablo owners, the sidewall decision is simple because Blackwall is already in keeping with the model’s original period character. The more meaningful comparison comes from brand, speed rating, and wheel-width compatibility within the correct front or rear size. If originality matters, Blackwall keeps the appearance consistent with the Diablo’s factory-era look without introducing a sidewall style associated with an earlier collector-car period.

1991 Lamborghini Diablo fitments are covered by BFGoodrich and Michelin. BFGoodrich supplies the 245/40R17 front size through multiple g-Force family products, while Michelin covers the 335/35R17 rear size with the Pilot Sport II. All of these are radial Blackwall tires sized for the Diablo’s 17-inch wheels.

That split matters because a Diablo owner may not be choosing between the same two brands at both ends of the car. The front size offers more than one BFGoodrich option, while the rear size is a single Michelin fitment in this range. When replacing tires, compare the car’s current setup first so you can decide whether you are matching an existing pair on one axle or refreshing the full staggered set.

For the 1991 Lamborghini Diablo’s 245/40R17 front size, the BFGoodrich g-Force Comp 2 A/S and g-Force Phenom T/A share radial construction, Blackwall styling, and a 17-inch rim diameter, but they differ in important details. The Comp 2 A/S weighs 26 pounds, while the Phenom T/A comes in at 25.88 pounds. The Phenom T/A also carries a 95Y marking with a max load of 1,521 pounds at 50 psi, while the available Comp 2 products in this size include 91W versions and one max-load figure of 1,356 pounds at 51 psi.

Those differences make the side-by-side comparison more about exact specification than appearance, since both present as modern Blackwall radials. A Diablo owner should look beyond the shared 245/40ZR17 code and confirm speed symbol, load figure, and accepted rim-width range before choosing one over the other. That approach is especially helpful if the car sees spirited road use and you want the front tire’s specification to match your driving expectations closely.

1991 Lamborghini Diablo tires use different rim-width ranges front and rear. In 245/40R17, the accepted wheel width runs from 7.0 to 9.5 inches depending on the specific tire. In 335/35R17, the accepted wheel width is 11.0 to 13.0 inches. Both sizes fit 17-inch rims, but the wheel-width spread is very different because the rear tire is dramatically wider.

That means rim diameter alone is not enough when checking Diablo fitment. A front wheel that accepts a 245/40R17 will not automatically suit a 335/35R17, even though both are 17-inch tires. Before replacing tires on an exotic that may have seen aftermarket wheel changes over the years, measure or confirm the wheel width at each axle and match it to the exact tire you plan to use.

The available 1991 Lamborghini Diablo tires are modern radial fitments without tube-type markings in the size designations shown here. Their format and construction align with tubeless-style performance tires rather than tube-type collector-car casings. That said, wheel condition and any prior wheel modifications still matter on a car of this type.

A Diablo owner should verify the wheel itself before assuming any tire installation detail carries over from a previous setup. If the car still wears original-style wheels, confirm valve-stem condition and inspect the bead seats carefully during mounting. If aftermarket wheels are present, follow the wheel maker’s guidance as well, since the correct tire size alone does not answer every installation question on a 1991 Lamborghini.

A 1991 Lamborghini Diablo uses 17-inch wheels for both of its tire sizes, so the original wheel diameter is compatible with both 245/40R17 and 335/35R17. Compatibility does not mean the same wheel works in both positions, however, because the front and rear tires require very different wheel-width ranges. The front size accepts approximately 7.0 to 9.5-inch wheels depending on the tire, while the rear size needs 11.0 to 13.0-inch width.

That is typical for a staggered supercar layout and is part of what gives the Diablo its visual drama and rear traction emphasis. If your car remains on factory-style wheels, the main goal is preserving that front-to-rear distinction. If wheel widths have been altered over time, confirm each axle independently rather than assuming any 17-inch Lamborghini wheel can carry either tire size.

A 1991 Lamborghini should be stored in a cool, dry space away from direct sunlight, electric motors, battery chargers, furnaces, and other ozone sources that can age rubber prematurely. Keep the tires clean, maintain inflation, and move the car periodically if it sits for long periods so the same contact patch is not loaded in one spot month after month. Low-profile radial tires generally resist storage flat-spotting better than older bias-ply designs, but they still benefit from proper support and regular movement.

For a Diablo, storage habits matter because the car’s wide rear tires and low ride height make any neglected tire issue more noticeable when the car goes back on the road. If the car will sit seasonally, check pressure before and after storage and inspect the sidewalls for early cracking. Some owners also use flat-stopper pads or stands to reduce stress during longer storage intervals.

On a 1991 Lamborghini, tire life is usually judged more by age than by mileage, especially on collector cars that are driven occasionally. A practical rule is to begin evaluating tires closely once they reach five to seven years of age and to treat ten years as a point where replacement deserves serious consideration regardless of tread depth. The DOT date code on each tire is the key reference for age.

That approach is especially important on a Diablo because a high-performance exotic may accumulate very few miles while the rubber hardens over time. A tire can still look visually acceptable and yet be well past its most trustworthy service age. If your 1991 Lamborghini still wears an older set, check the date codes first, then inspect for cracking, hardening, vibration, or pressure loss before deciding to keep them in use.

Tires on a 1991 Lamborghini should be inspected before every drive and again before any longer outing or highway trip. Check inflation, tread condition, sidewall cracking, punctures, bulges, and signs of uneven wear, paying particular attention to the inside shoulder where problems can be easier to miss on a low exotic. Valve stems should also be checked closely because age and heat affect them just as surely as the tire itself.

Frequent inspection matters on a Diablo because the car’s performance envelope can expose a tire problem very quickly once speeds rise. It also helps you catch alignment or suspension issues early if one tire begins wearing differently from its mate on the same axle. Make inspection part of the car’s regular pre-drive routine, not something saved only for annual service.

1991 Lamborghini Diablo tires are highway-capable radial performance tires, and the available front fitments include W and Y speed ratings, which correspond to 168 mph and 186+ mph service. The rear 335/35ZR17 is also a high-speed radial format appropriate to the Diablo’s supercar character. At normal U.S. highway speeds, the car’s overall condition, alignment, suspension health, and brake system are every bit as important as the tire’s speed symbol.

That means a sound, correctly fitted tire setup is only one part of safe road use on a 1991 Lamborghini. Even an exotic with very capable tires should not be driven hard on old rubber, underinflated tires, or mismatched axle pairs. If the car has been stored, serviced infrequently, or recently acquired, give it a full mechanical and tire inspection before treating it like a modern everyday performance car.

Inflation pressure for a 1991 Lamborghini should follow the vehicle manufacturer’s recommendation first, with the tire maker’s maximum-pressure marking understood as a load-rating reference rather than a universal running pressure. In the 245/40R17 front size, one BFGoodrich product carries a max load of 1,356 pounds at 51 psi, while another carries 1,521 pounds at 50 psi. Those figures should not be transferred automatically to the rear 335/35R17 or treated as the default cold setting for every Diablo.

The practical move is to check the owner’s manual, door-jamb decal if present, or trusted marque guidance for factory pressure targets, then confirm the chosen tire is used within its own rated limits. Front and rear pressures may differ on a staggered supercar, so avoid the temptation to use one number all around. Recheck pressures when the weather changes or before any longer drive.

Before a longer drive in a 1991 Lamborghini, inspect all four tires for cracking, cuts, punctures, bulges, uneven wear, and proper cold inflation. Confirm that the front axle carries 245/40R17 tires and the rear axle carries 335/35R17 tires, and check the spare as well if the car is equipped with one. On a low, high-performance exotic, it also makes sense to inspect valve stems, look for wheel damage, and verify that no tire is rubbing after suspension compression or steering lock.

A tire check should be part of a broader pre-drive review that also covers brakes, fluids, belts, cooling, and battery condition. The Diablo is now a collector-era supercar, so age-related issues can matter more than raw mileage. Spending a few minutes on those checks before a trip helps protect both the car and the driving experience.