2018 Karma Tire Fitment Guide

2018 Karma vehicles use four tire sizes, all on the Revero: 245/40R21, 265/40R21, 255/35R22, and 285/35R22. Those sizes are split across two rim diameters, with 21-inch and 22-inch fitments rather than one shared year-wide size. The 285/35R22 size mounts on a 22-inch rim, and the other sizes follow their stated 21-inch or 22-inch diameters from the size code itself.

That means a 2018 Karma owner needs to confirm more than just year and make before replacing tires. Check the Revero’s actual wheel package and confirm the correct front and rear sizes already on the car, because these are staggered-style fitments and not interchangeable across every position. Matching the exact size code on each axle is the safest starting point.

On a 2018 Karma, 245/40R21 is a metric radial tire size. The 245 is the nominal section width in millimeters, 40 is the aspect ratio, R means radial construction, and 21 is the wheel diameter in inches. It is one of the Revero’s 21-inch fitments rather than a universal size for every possible wheel setup on the car.

That breakdown matters because each part of the code affects how the tire matches the wheel and the vehicle’s original stance. A 245/40R21 should only replace another 245/40R21 unless you are deliberately reworking the wheel-and-tire package with expert guidance. For most owners, the correct move is to match the existing size and confirm its axle position.

On a 2018 Karma, 285/35R22 is a metric radial size with a 285-millimeter nominal section width, a 35-series aspect ratio, radial construction, and a 22-inch rim diameter. This size appears on the Revero’s 22-inch fitment and is not interchangeable with the 21-inch sizes. In available product form here, it appears as 285/35R22XL 106W, which also adds extra-load capability and a W speed rating.

For a buyer, that means the tire code is doing several jobs at once: it confirms the wheel diameter, the profile, and the basic performance category. If your 2018 Karma is equipped with 22-inch wheels, you still need to verify whether 285/35R22 belongs at the front or rear on your specific car. Matching the full sidewall code is the most reliable replacement method.

Nitto currently covers the 285/35R22 size for 2018 Karma vehicles on this page, specifically through the NT555 G2. All 2018 Karma fitments in this guide are radial, so the brand conversation here is less about old-versus-new construction and more about finding the exact size match for the wheel package on the Revero.

Because the 2018 Karma is a specialized low-volume luxury car with large modern wheel diameters, brand coverage can differ by size. A buyer should start with the exact tire code on the car, then compare the available product’s sidewall style, speed rating, and load marking to the intended use. That approach is more useful than choosing by brand name alone.

Blackwall is the sidewall style currently present for the 285/35R22 tire used on the 2018 Karma Revero. That suits the Revero’s contemporary luxury-performance character, since a plain black sidewall typically complements modern large-diameter wheel designs more naturally than a vintage-style whitewall treatment would.

Sidewall style matters visually, especially on a car like the 2018 Karma where the wheel-and-tire package is a major part of the overall look. If you are replacing one axle at a time, try to keep sidewall appearance consistent side to side and ideally front to rear. Matching style along with size helps preserve the intended visual balance of the car.

For the 2018 Karma size covered here, the Nitto NT555 G2 appears in 285/35R22XL 106W form with radial construction, a blackwall sidewall, and a W speed rating. That makes it a modern performance-oriented fitment in a large-diameter size, with the sidewall code itself providing the key comparables: size, load index, extra-load marking, and speed category.

When comparing any alternative for a 2018 Karma, focus first on whether it matches the exact size and wheel diameter, then compare the load index and speed rating. On a staggered luxury EV sedan, visual differences may be subtle but dimensional differences are critical. If an alternative tire does not mirror the original code closely, confirm compatibility before moving ahead.

2018 Karma tires in these sizes are modern radial fitments, and the available 285/35R22 product does not carry a tube-type marking. That points buyers toward contemporary tubeless-style use on the proper wheel, which is typical for late-model luxury and performance applications with 21-inch and 22-inch rims.

Even so, the smart check is the actual sidewall marking on the exact tire you choose and the condition of the wheel itself. If the wheel has any damage, corrosion at the bead seat, or prior repair issues, those problems matter more than assumptions about the tire category. A clean wheel and proper valve hardware are part of a reliable setup.

No single original 2018 Karma wheel works with all four tire sizes, because the Revero uses both 21-inch and 22-inch rim diameters. A 21-inch wheel can only accept the 245/40R21 or 265/40R21 sizes, while a 22-inch wheel is required for the 255/35R22 or 285/35R22 sizes. Rim diameter is fixed by the final number in the tire code.

That means wheel-package confirmation comes before product selection. If the car is already wearing factory-style wheels, the current tire sidewall usually tells you which diameter you have. If the car has had wheels changed at some point, verify the actual wheel size and compare front and rear before replacing tires, especially on a staggered setup.

A 2018 Karma should be stored in a cool, dry, dark space away from direct sunlight, ozone-producing equipment, and large temperature swings. Keep the tires inflated to the appropriate operating range for storage checks, and move the car periodically if it will sit for extended periods. Radial tires generally tolerate storage better than older bias-ply designs, but low-profile modern tires still age from heat, UV exposure, and inactivity.

The Revero’s large wheels and lower-profile tires make cosmetic sidewall condition especially easy to monitor, so inspect them regularly during storage. If the car will sit for many months, some owners use tire cradles or stands to reduce prolonged load in one contact patch area. That extra care is worthwhile on a heavy luxury EV sedan that may not be driven often.

On a 2018 Karma, tire age usually matters more than mileage because many specialty and collector-oriented vehicles accumulate miles slowly. A practical rule is to begin closer evaluation around five to seven years of age and treat about ten years as a serious replacement consideration regardless of tread depth. The DOT date code on each tire sidewall is the best reference point for age.

That matters even more if the car still looks good cosmetically but spends long periods parked. Heat cycles, UV exposure, and storage conditions all affect the tire long before the tread appears worn out. For a 2018 Karma, a tire that has plenty of tread but shows age cracking or hardening should be judged by condition and date, not by mileage alone.

Tires on a 2018 Karma should be inspected before every drive and more carefully before any longer outing. Look for pressure loss, sidewall cracking, punctures, bulges, irregular wear, and any signs of curb impact damage, especially because low-profile 21-inch and 22-inch fitments leave less sidewall margin than taller classic-car tires.

A quick inspection takes only a few minutes and can prevent being stranded by a problem that developed in storage. Pay close attention to the inner shoulder as well as the visible outer sidewall, since alignment or suspension issues often show up there first. If the car has been sitting, check the spare condition too if one is carried.

The 2018 Karma Revero was built in the modern era and uses radial tire sizing, with 21-inch and 22-inch metric fitments appearing across the model. That means originality for a 2018 Karma centers on matching the correct modern size code, wheel diameter, and overall visual character rather than recreating an older bias-ply or period whitewall look.

Owners pursuing factory-correct presentation should verify the exact original wheel package on their individual car and preserve the proper front-to-rear sizing relationship. If a previous owner changed wheels or tires, return-to-stock work starts by confirming the existing wheel diameters and comparing them to the factory-style setup. Karma specialists and marque communities can help with package-specific confirmation.

Correct tire fitment does matter when showing a 2018 Karma, even though it is a modern collector rather than a brass-era or muscle-car restoration. Judges and knowledgeable enthusiasts will notice if the wheel diameter, aspect ratio, sidewall appearance, or front-to-rear proportion looks off for the Revero’s original design language. On a car with dramatic body lines and large wheels, tire stance is part of the presentation.

The safest approach is to keep the exact metric sizes appropriate to the wheel package and avoid substitutions that change the car’s visual balance. Even a small difference in profile can alter the way the Revero sits in the wheel opening. If the car is being prepared for high-level presentation, compare the tire codes on the car with factory-style references before the event.

Matching the intended front and rear tire sizes on a 2018 Karma is a key part of authenticity because the Revero’s overall look depends on its staggered, large-wheel stance. The four sizes used across the model are not simply cosmetic alternatives; they correspond to specific wheel diameters and fitment positions within the car’s original package choices.

That means authenticity is not just about choosing any tire that fits the rim. A mismatch in front-to-rear sizing can upset the car’s intended proportions and make the vehicle look incorrect to a knowledgeable observer. If originality matters, replace tires by exact size code and verify that each axle still carries the proper diameter and profile.

2018 Karma tires can be appropriate for highway driving when the exact size, load capacity, inflation, and condition are all correct. The available 285/35R22 product carries a W speed rating, which corresponds to a 168 mph ceiling, far beyond normal U.S. highway speeds. In real-world use, tire age, inflation pressure, and the car’s overall mechanical condition matter more than the headline speed letter alone.

That is especially true on a 2018 Karma because it is a heavy, powerful luxury EV sedan with large-diameter low-profile tires. A fresh, properly inflated tire in the correct size is only one part of safe road use. Before sustained highway driving, confirm condition on all four tires and make sure the car’s alignment, braking system, and suspension are also in good order.

Inflation pressure for a 2018 Karma should follow the factory vehicle recommendation first, because that setting reflects the car’s weight distribution, intended ride, and original wheel-and-tire package. The available 285/35R22 tire also carries its own load and pressure framework through the sidewall service description, but that should not be treated as a blanket pressure target for every 2018 Karma size.

Use the door-jamb label or owner’s literature for the car’s baseline pressure, then compare that with the tire manufacturer’s sidewall and service information for the exact tire you are using. Do not transfer a pressure figure from a 22-inch rear-size tire to a 21-inch fitment or vice versa. Keeping each axle at the proper specification supports both safety and tire wear.

Before a longer drive in a 2018 Karma, inspect all four tires for cracking, cuts, punctures, bulges, and uneven wear, then verify cold inflation pressure. Check that each tire size matches the intended wheel position, since the Revero uses multiple sizes across 21-inch and 22-inch packages. Also examine valve stems and confirm the spare or mobility equipment is ready if the car carries it.

A tire check should be part of a broader pre-drive routine on a modern collector or specialty vehicle. Brakes, suspension behavior, charging status, and general warning-light condition all deserve attention before a trip. If the car has been parked for an extended time, give it a shorter local drive first so any vibration, pressure loss, or ride issue appears before the longer run.