By 1986 Bertone had become the name on the X-1/9, carrying forward one of the most recognizable small Italian sports cars of the late twentieth century. The mid-engine layout, compact dimensions, and targa-roof character gave 1986 Bertone a distinctly European feel, even in the U.S. collector market. For this year and make, the tire question is refreshingly straightforward: one model uses one radial size, so the decision is less about comparing multiple fitments and more about choosing the right product style within that original sizing theme. Before moving ahead, confirm that your car is a 1986 Bertone X-1/9 and that your wheels are still set up for the stock 13-inch tire size.
Which Tire Size Is Right for Your 1986 Bertone
There is one tire size for 1986 Bertone, and it is shared by the full model range because the year centers on a single model. The main decision is not between different fitments, but between products within the same 13-inch radial size once you confirm the correct wheel diameter. Understanding what the size code means before choosing a product saves time and helps ensure the right match.
Year(s): 1986|Fit(s): X-1/9|Construction: Radial|Rim: 13-in rim
165/70R13 is a metric radial size with a 165-millimeter section width, a 70-series aspect ratio, radial construction, and a 13-inch rim diameter. This size is used across the 1986 Bertone X-1/9 range. It suits owners who want to stay with the proper modern-era metric radial format for the car while selecting the product details that best fit their driving style and restoration goals.
One model is covered for 1986 Bertone. Because the entire year-and-make range centers on the X-1/9, tire sizing does not vary by model and the key task is confirming the correct product within the shared size. Select the model below for model-specific fitment history and products.
1986 Bertone X-1/9
The 1986 Bertone X-1/9 is a compact mid-engine sports car with Italian styling and a strong enthusiast following for its nimble road manners and distinctive targa-roof layout. Its tires mount on 13-inch wheels, keeping the fitment aligned with the light, responsive character that made the X-1/9 memorable in period and appealing today.
These answers focus on the single-size fitment used by 1986 Bertone X-1/9 models, including how to read the metric radial code, what to confirm at the wheel, and how to care for tires on a lightly driven collector car.
Size Basics & Fitment
What tire sizes fit 1986 Bertone vehicles?
1986 Bertone vehicles use one tire size: 165/70R13. That size applies to the 1986 Bertone X-1/9 and mounts on a 13-inch wheel, so there is no split fitment across different Bertone models for this year. The fitment question is simple compared with many year-and-make pages because there is only one model and one radial size to match.
That simplicity is helpful, but it still pays to verify the actual wheels on the car before choosing a tire. Many collector cars have seen wheel swaps over the years, and the X-1/9 community has long experimented with alternate wheel packages. If your 1986 Bertone still wears its stock-diameter 13-inch wheels, 165/70R13 is the correct starting point for preserving the car’s intended proportions and steering character.
What does 165/70R13 mean on a 1986 Bertone tire?
On a 1986 Bertone tire, 165/70R13 breaks down into four parts. The 165 is the nominal section width in millimeters, the 70 is the aspect ratio, the R identifies radial construction, and the 13 is the wheel diameter in inches. It is a modern metric radial format rather than an older numeric or alphanumeric bias-ply size.
Reading the code correctly helps prevent one of the most common ordering mistakes: matching only the wheel diameter while overlooking width and profile. A 13-inch tire can still be wrong if the section width or aspect ratio differs too much from the intended size. For a 1986 Bertone X-1/9, the full 165/70R13 code matters because all four parts influence stance, clearance, gearing feel, and speedometer behavior.
Do all 1986 Bertone models use the same tire size?
Yes. The 1986 Bertone range centers on the X-1/9, and that model uses 165/70R13. There is no year-level split between multiple Bertone models or multiple factory-type tire sizes here, so the fitment path is much more direct than it would be on a larger make with sedans, wagons, and performance variants sharing the same model year.
Even with that one-size layout, condition and originality still matter. A restored X-1/9 on original-style 13-inch wheels may call for a different product character than a regularly driven example with updated suspension or wheels of the same diameter. Once you know you have a 1986 Bertone X-1/9 on 13-inch wheels, the next step is comparing product construction details and appearance rather than sorting through multiple factory size families.
Buying the Right Tire
What brands make tires for 1986 Bertone vehicles?
Only one fitment is used across 1986 Bertone vehicles at the year-and-make level, and that fitment is 165/70R13 for the X-1/9. Brand choice therefore comes down to whichever manufacturers currently build that metric radial size in a style and specification appropriate for a light European sports car. The key point is that brand selection happens within one size family rather than across several competing fitments.
Brand matters most when you are balancing period appearance, tread design, road manners, and how the finished tire complements the car visually. On an X-1/9, sidewall shape and overall look can influence the car’s stance almost as much as outright dimensions. Once you have confirmed 165/70R13 on 13-inch wheels, compare brands by the exact size marking, speed category if applicable, and the kind of use your Bertone sees most often.
How should I choose the right tire for a 1986 Bertone X-1/9 if there is only one size?
With a 1986 Bertone X-1/9, the decision is centered on choosing the right 165/70R13 product rather than choosing among multiple factory size codes. Since the fitment is already narrowed to one metric radial size, the variables that matter most are the tire’s overall character, sidewall appearance, and whether its intended use aligns with how you drive the car.
A lightly used collector car may place more emphasis on period look and presentation, while a regularly exercised X-1/9 owner may care more about road manners and consistency in everyday use. That does not change the size itself, but it can change which tire within that size feels most appropriate. Confirm your wheel diameter first, then compare the available 165/70R13 choices with your priorities in mind.
What sidewall styles make the most sense for 1986 Bertone tires?
A 1986 Bertone sits in a period where a clean radial sidewall appearance is usually the most natural visual fit. The X-1/9 is an Italian sports car from the mid-1980s, so an understated radial profile generally looks more in character than a heavily stylized vintage sidewall treatment that belongs to an earlier American restoration theme.
Sidewall choice affects how authentic the car feels at a glance, especially on a small-bodied sports car with modest wheel diameter and relatively visible tire proportion. Owners aiming for an era-appropriate presentation usually favor a sidewall treatment that matches the car’s late-classic European personality. Owners focused more on casual driving may still prefer that same restrained look simply because it complements the X-1/9’s sharp, tidy proportions.
Fitting & Setup
Do 1986 Bertone tires require inner tubes?
The 1986 Bertone X-1/9 uses a radial size, 165/70R13, that is commonly associated with tubeless passenger-car fitment when paired with the proper wheel. Tube use is therefore not the default assumption for a stock-style 13-inch setup. The more important issue is the condition and design of the wheel itself, especially on an older collector car that may have original rims, refinished wheels, or replacement aftermarket wheels.
If your wheels are original, inspect the bead seats and valve-stem areas carefully before mounting new tires. A sound tubeless wheel and valve arrangement should be confirmed during installation rather than assumed because of the size code alone. If the car has unusual wheel modifications or older specialty rims, a knowledgeable installer or marque specialist can help determine whether the wheel is appropriate for tubeless radial service.
Can the original 1986 Bertone wheels be used with 165/70R13 tires?
Yes, provided your 1986 Bertone X-1/9 still has original-specification 13-inch wheels in proper serviceable condition. The 165/70R13 size is built for a 13-inch rim, which matches the wheel diameter used by the model. That makes original wheels the natural home for the correct factory-type tire size, assuming there is no damage, corrosion, or previous alteration that affects safe mounting.
Wheel condition matters just as much as wheel diameter on a collector sports car. Before mounting new tires, have the wheels checked for trueness, bead-seat condition, and any age-related cracking or repairs that could affect sealing and balance. If your X-1/9 has been upgraded to a different diameter wheel at some point in its life, use the actual wheel size on the car as your first checkpoint rather than relying only on year-and-make identification.
Maintenance, Storage & Longevity
How should I store a 1986 Bertone when the tires are fitted?
A 1986 Bertone should be stored in a cool, dry, dark space with the tires kept away from direct sunlight, electric motors, battery chargers, welders, and other ozone-producing equipment. Tire pressure should be maintained during storage, and the car should be moved periodically so it does not rest on the same contact patch for months at a time. Radials generally tolerate storage better than older bias-ply designs, but they still age from time and environment.
If the car will sit for a long season, many owners either roll it occasionally or support it in a way that reduces prolonged static load while still respecting suspension geometry. Clean tires with mild soap and water only, and avoid dressings that can leave residue on tread or sidewalls. Good storage habits preserve appearance, reduce flat-spotting, and make the X-1/9 more pleasant to return to after winter or long periods off the road.
How long do tires on a 1986 Bertone typically last?
Tires on a 1986 Bertone should be judged more by age and condition than by mileage. Collector cars such as the X-1/9 often accumulate very few miles, yet the rubber, internal structure, and valve components still age over time. A sensible rule is to begin evaluating tires closely once they reach the five-to-seven-year range and to treat around ten years as a point where replacement deserves serious consideration regardless of tread depth.
The date code on the tire helps establish its age, but visual and driving-condition checks matter too. Sidewall cracking, hardening, vibration, and pressure loss can appear long before the tread looks worn out. A lightly used sports car can tempt owners to keep old tires because they still look presentable, but age-related deterioration is often the bigger risk than tread wear on a 1986 Bertone.
How often should tires on a 1986 Bertone be inspected?
Tires on a 1986 Bertone should be inspected before every drive, especially if the car is driven infrequently. Start with pressure, then look for cracking, punctures, bulges, uneven wear, and any signs that the tire has been rubbing under steering or suspension movement. A compact mid-engine sports car can feel very sensitive to tire condition, so even small changes in pressure or sidewall health are worth catching early.
A deeper inspection makes sense before longer trips or event weekends. Check the spare as well, and pay attention to valve stems, wheel sealing surfaces, and the overall age of the tires, not just their appearance from a few feet away. Frequent inspection is one of the simplest ways to preserve confidence behind the wheel of a 1986 Bertone X-1/9, particularly if the car spends long periods parked between outings.
Restoration & Authenticity
What tires were originally fitted to the 1986 Bertone X-1/9?
A 1986 Bertone X-1/9 belongs to an era when metric radial tires were standard practice, and 165/70R13 is the correct size family for the model. That means the original fitment theme is radial rather than bias-ply, with a 13-inch wheel diameter appropriate to the car’s compact European sports-car layout. Original-equipment branding could vary by market and supply, so size, construction type, and overall look are usually the safest authenticity anchors.
For a restoration, getting the size and period-correct radial character right will matter more than chasing a brand name without firm evidence. If your X-1/9 is headed for judged competition, confirm event-specific expectations with a Bertone or Fiat marque club, since regional delivery differences and replacement history can complicate originality research. That extra step helps separate true period fitment practice from decades of owner-installed substitutions.
Does correct tire fitment matter for showing a 1986 Bertone?
Yes, correct tire fitment matters on a 1986 Bertone because judges and knowledgeable enthusiasts notice whether the size, construction, and overall visual character suit the car’s period. On an X-1/9, the tire is highly visible relative to the body size, so a wrong profile or overly modern-looking substitute can change the car’s stance and visual balance quickly. A proper 165/70R13 radial keeps the presentation aligned with the era.
What counts as acceptable can vary by show standard. Some events reward clean, tasteful road-use choices, while stricter originality judging may scrutinize sidewall appearance and whether the tire captures the right late-1980s European feel. If show points matter, treat tire selection as part of the restoration plan rather than as a last-minute consumable purchase. That approach usually produces a more convincing finished car overall.
Why is the correct 13-inch tire size important to the look of a 1986 Bertone X-1/9?
The 1986 Bertone X-1/9 is a small, crisply styled sports car, and its proportions depend heavily on keeping the tire size in scale with the body and wheel openings. A 165/70R13 maintains the compact visual balance that suits the car’s wedge-era design. Moving too far away from that size can make the car look under-tired, over-tired, or simply less true to the character that made the X-1/9 distinctive.
That visual effect is especially noticeable because the X-1/9 has a low stance and relatively tidy wheel openings. Owners restoring a car for shows or period-correct presentation usually find that staying close to the proper size pays off in both appearance and how authentically the car reads from a distance. Even for casual use, the correct proportion often feels more satisfying than a substitute chosen only for convenience.
Safety & Road Use
Are 1986 Bertone tires safe for highway driving?
A 1986 Bertone X-1/9 can be safe for highway driving when it is fitted with the correct 165/70R13 tires in good condition and the rest of the car is equally well sorted. Because this fitment is a radial size, it aligns with the kind of road use expected of a mid-1980s sports car. In real-world collector use, tire age, inflation, and overall vehicle condition usually matter more than theoretical top-speed concerns alone.
Highway confidence in an X-1/9 also depends on brakes, suspension, alignment, wheel condition, and how long the car has been sitting. A fresh set of correctly sized tires cannot compensate for neglected steering parts or aging dampers. Before sustained highway use, inspect the whole chassis and make sure the tires are free from cracking, vibration, or pressure loss. Safe road manners come from the system as a whole, not just the tire itself.
What inflation pressure should I use for 1986 Bertone tires?
Inflation pressure for 1986 Bertone tires should be set with the original vehicle recommendations and the individual tire’s construction limits in mind. The correct fitment is 165/70R13, but pressure should not be guessed simply from size alone because the vehicle manufacturer’s intended balance and the tire manufacturer’s maximum-pressure marking serve different purposes. The owner’s manual or factory placard remains the best starting point for running pressure.
Use the tire sidewall marking as a limit reference, not as an automatic everyday setting. On a light sports car such as the X-1/9, even a small pressure change can influence steering feel, ride quality, and tread wear. Set pressures cold, recheck them regularly, and make small adjustments only after confirming what the car originally called for. That approach preserves both handling balance and tire life better than informal guesswork.
What should I check before taking a 1986 Bertone on a longer drive?
Before taking a 1986 Bertone on a longer drive, inspect all four tires for cracking, cuts, bulges, uneven wear, proper cold inflation, and any sign of rubbing or impact damage. Check the valve stems, make sure the spare is serviceable, and confirm that the tires are not simply old but still presentable. Since the X-1/9 is a compact sports car, it is worth paying close attention to steering feel and vibration during the first few miles.
A longer drive also calls for a broader age-appropriate mechanical check. Brake function, cooling system health, wheel bearing condition, and basic fluid levels all matter on a mid-1980s collector car that may not be used daily. Tires are only one part of the readiness picture, but they are the part in direct contact with the road. A careful pre-drive inspection helps you enjoy the car with far more confidence.
