2021 Polestar Tire Fitment Guide

2021 Polestar vehicles use four sizes across two models. The Polestar 1 uses 275/30R21 and 295/30R21, both on 21-inch rims. The Polestar 2 uses 245/40R20 on 20-inch rims or 245/45R19 on 19-inch rims. Rim width guidance appears for the Polestar 2 sizes: 245/40R20 fits 8.0 to 9.5-inch rims, and 245/45R19 fits 7.5 to 9.0-inch rims.

The practical takeaway is that year and make alone are not enough for 2021 Polestar fitment. You need to confirm whether the car is a Polestar 1 or Polestar 2, then confirm the actual wheel diameter before selecting a tire. That matters especially on the Polestar 2, where both 19-inch and 20-inch fitments exist within the same model line.

On a 2021 Polestar, 245/40R20 is a metric radial size. The 245 is the section width in millimeters, 40 is the aspect ratio, R means radial construction, and 20 is the wheel diameter in inches. For 2021 Polestar use, that size belongs to the Polestar 2 and mounts on 20-inch rims with an 8.0 to 9.5-inch rim width range on products where that range is stated.

That code matters because every part of it affects fitment, not just the wheel diameter. A 245/40R20 is shorter in sidewall than a 245/45R19, even though both are 245 millimeters wide, so they are not interchangeable unless the wheel diameter matches and the car is equipped for that specific size. Always compare the sidewall code on the tire already on the car with the actual wheel before ordering.

No. 2021 Polestar models do not share a common tire size across the range. The Polestar 1 uses 21-inch radial sizes, specifically 275/30R21 and 295/30R21, while the Polestar 2 uses either 245/45R19 or 245/40R20 depending on wheel package. There is no overlap between the Polestar 1 and Polestar 2 sizes.

That makes model identification the first step in any 2021 Polestar tire search. If you own a Polestar 1, you are working within a dedicated 21-inch staggered setup. If you own a Polestar 2, the key question is whether the car is wearing 19-inch or 20-inch wheels. Checking the tire sidewall and the wheel itself is the fastest way to avoid crossing into the wrong fitment family.

Sidewall style varies by size on 2021 Polestar applications that have current product coverage here. The 245/40R20 for the Polestar 2 is available in both Blackwall and RWL form, while the 245/45R19 appears in Blackwall only. The 21-inch Polestar 1 sizes are represented as fitments, but sidewall style detail is not reflected here in the same way.

Most Polestar buyers will gravitate toward Blackwall tires because they align with the understated modern appearance of the brand. RWL adds a more overt performance look, which some owners may like on a customized or more expressive setup. The key is to decide whether visual subtlety or a stronger sidewall statement better suits the car before narrowing down among products in the same size.

For 2021 Polestar applications with active product coverage here, BFGoodrich, Nitto, and Pro-Trac appear across the available sizes. The 245/40R20 is available from BFGoodrich, Nitto, and Pro-Trac, while the 245/45R19 is available from BFGoodrich and Nitto. All of those current offerings are radial tires suited to the modern sizing used on the Polestar 2.

Brand choice becomes a way to compare product character within the correct size rather than a way to overcome fitment differences. Start by matching the exact size and wheel diameter, then compare the available brand options in that size for sidewall style and speed rating. That keeps the search focused on tires that belong on the car rather than simply on recognizable brand names.

On the 2021 Polestar 2, both BFGoodrich and Nitto appear in 245/40R20 and 245/45R19 radial sizes, and both brands offer Blackwall products. In 245/40R20, BFGoodrich appears in W-rated and Y-rated forms, while Nitto appears as a W-rated option. In 245/45R19, BFGoodrich again appears in both W-rated and Y-rated forms, while Nitto appears as W-rated. Where load data is shown, BFGoodrich g-Force Phenom T/A carries 1,709 pounds at 50 psi in 245/40R20 and 1,874 pounds at 50 psi in 245/45R19.

For a buyer, that means the real comparison is not just brand name but the exact series and rating within the same size. If speed rating or load information matters for your use, compare the sidewall markings carefully instead of assuming all 245/40R20 or all 245/45R19 products are equivalent. Once the size is confirmed, details like W versus Y rating can help narrow the field within the same basic fitment.

Rim width guidance is available for the two Polestar 2 sizes. The 245/40R20 fits 8.0 to 9.5-inch rims on one product and 8 to 9.5 inches on another, while the 245/45R19 fits 7.5 to 9.0-inch rims on one product and 7.5 to 9 inches on another. The Polestar 1 sizes are 21-inch fitments, but rim width detail is not reflected here in the same way.

That means the Polestar 2 owner can compare both tire size and wheel width before choosing a product, especially if the car has aftermarket wheels. Staying inside the stated rim width range helps preserve the tire’s intended shape and behavior. If the wheel width is close to either limit, confirm the exact tire series rather than assuming every product in that size shares identical wheel-width tolerance.

The 2021 Polestar sizes covered here are modern radial fitments, and tube-type markings do not appear on the available 245/40R20 or 245/45R19 products. That points buyers toward tubeless-style modern fitment practice for those Polestar 2 sizes. The two 21-inch Polestar 1 sizes are also modern radial sizes, but tube detail is not reflected here with product-level confirmation.

In practice, most owners should focus first on the condition of the wheel, valve stem, and bead seat rather than assuming a tube is part of the setup. If the car has factory wheels in good condition, a modern radial tire is typically paired with a tubeless wheel environment. When originality, repair history, or aftermarket wheel design raises questions, confirm directly from the wheel and the tire sidewall before mounting.

No single original 2021 Polestar wheel can be assumed to work across all four sizes, because the lineup uses 19-inch, 20-inch, and 21-inch rim diameters. The Polestar 1 uses 21-inch sizes, while the Polestar 2 uses either 19-inch or 20-inch sizes depending on wheel package. A tire must match the wheel diameter exactly.

That makes wheel verification essential before any tire change, especially on a used vehicle where wheel swaps may already have happened. A Polestar 2 owner deciding between 245/45R19 and 245/40R20 is really deciding based on the wheels already on the car, not on two interchangeable tire choices. Check the wheel diameter and the current sidewall markings before moving any further.

A 2021 Polestar should be stored in a cool, dry space away from direct sunlight, electric motors that generate ozone, heaters, solvents, and standing moisture. Keeping the tires clean and at the proper inflation pressure helps reduce casing stress during long static periods. Because these are radial tires, they generally tolerate storage better than older bias-ply designs, but they still age from time, heat, and environmental exposure.

For a collector or low-use vehicle, it helps to move the car periodically so the tires do not sit in one exact position for months at a time. If the car will be stored for an extended season, many owners use tire cradles or stands to reduce concentrated load. The goal is to minimize flat spotting, ozone exposure, and sidewall weathering while keeping the car ready for use.

Tires on a 2021 Polestar should be judged by age and condition as much as by tread depth. A good working rule is to begin close inspection and professional evaluation around five to seven years of service, with ten years often treated as a practical outer limit regardless of remaining tread. The DOT date code on the sidewall is the best way to confirm a tire’s actual age.

That age-based approach matters because many premium and enthusiast vehicles accumulate miles slowly. A tire can still look usable at a glance yet be far enough along in age that heat cycles, hardening, or internal degradation deserve attention. If a 2021 Polestar still wears early-production tires, the calendar may now be as important as the tread pattern when deciding whether replacement is wise.

Tires on a 2021 Polestar should be inspected before every drive and again before any longer highway outing. Look for sidewall cracking, punctures, cuts, bulges, uneven wear, and pressure loss, and make sure the valve stems are in sound condition. On a high-performance application with low-profile radials, curb damage and impact bruising deserve especially close attention.

That inspection routine is quick but valuable, particularly on cars that may sit for stretches between drives. A visual walk-around plus a pressure check can catch small issues before they become vibration, handling, or safety problems at speed. If the car feels different on the road than it did on the previous drive, stop and recheck the tires rather than assuming the change is minor.

The 2021 Polestar sizes with active product coverage here are modern radial tires with W and Y speed ratings depending on product. W-rated tires are rated up to 168 mph, and Y-rated tires are rated for 186+ mph. Those figures are well above normal U.S. highway speeds, so in ordinary use the tire’s speed rating is typically not the limiting factor on a healthy vehicle.

Highway safety still depends on more than the printed speed symbol. Correct size, proper inflation, age, impact damage, alignment condition, and overall vehicle maintenance all matter. On a performance-oriented EV or grand touring car, tire condition can affect braking feel, stability, and road noise just as much as top-speed capability. Choose a tire that matches the exact fitment first, then make sure the tire itself is fresh and properly maintained.

Inflation pressure for a 2021 Polestar should start with the vehicle placard or owner’s manual, because factory pressure targets are vehicle-specific even when tire sizes look similar. Product-level pressure figures here appear as load-pressure ratings rather than recommended vehicle settings: for example, one 245/40R20 tire carries 1,709 pounds at 50 psi, and one 245/45R19 tire carries 1,874 pounds at 50 psi. Those are maximum load references for those specific products, not blanket inflation instructions for every tire or every Polestar.

The practical approach is to separate manufacturer load ratings from the pressure the car is meant to run in service. Use the car’s placard for day-to-day inflation, then compare the sidewall markings of the specific tire you choose. Do not transfer a pressure figure from a 19-inch tire to a 20-inch tire, or from one product line to another, just because the section width is the same.

Before a longer drive in a 2021 Polestar, inspect each tire for cracking, cuts, punctures, bulges, uneven tread wear, and any sign of sidewall or bead damage. Verify cold inflation pressure, confirm the spare or repair setup is ready if the vehicle uses one, and check that valve stems and caps are secure. On low-profile performance tires, even minor impact damage from potholes or curbing is worth taking seriously.

A longer trip is also a good time to think beyond the tires themselves. Wheel condition, alignment, brake health, and suspension behavior all influence how the car will treat its tires over highway miles. If the car has been sitting, a short local test drive before the main trip can reveal vibration or pressure loss early. That extra check is simple insurance on a modern performance-oriented vehicle.