BMW i8 Tires

BMW i8 uses two tire sizes across the years listed here: 215/45R20 and 245/40R20. Both sizes appear for 2014, 2015, 2016, 2017, 2019, and 2020, and both are built for 20-inch rims. The important point is that BMW i8 does not use one universal size at all four corners, since these two sizes form a staggered setup with a narrower tire on one axle and a wider tire on the other.

That means the first step is to check the tire already mounted on the car and note whether you are replacing the front pair, the rear pair, or all four tires. A buyer who orders by year only can easily end up with the wrong width, so axle position matters just as much as model year on BMW i8.

On BMW i8, 215/45R20 is a modern metric radial size. The 215 is the nominal section width in millimeters, 45 is the aspect ratio, meaning the sidewall height is 45 percent of the section width, R identifies radial construction, and 20 is the rim diameter in inches. This is one of the two sizes used on the listed BMW i8 years.

Reading the code correctly helps you avoid substituting a tire that looks close but changes the car's balance, wheel fit, or overall stance. When replacing BMW i8 tires, match the full size code exactly and confirm that the tire is intended for the correct axle in the staggered arrangement.

A 2016 BMW i8 has 215/45R20 and 245/40R20 listed because the car uses a staggered tire arrangement. Both sizes share the same 20-inch rim diameter and both are radial metric sizes, but they differ in width and profile. That split is not a year-to-year change in wheel diameter or construction type; it is part of the model's front-to-rear fitment strategy.

The practical takeaway is that you need to identify the axle before choosing a replacement. If you are standing next to the car, read the sidewall on the tire you are replacing and compare it to the wheel position, since that is the simplest way to avoid mixing the narrower and wider BMW i8 sizes.

The BMW i8 sizes listed here both use a 20-inch rim diameter. That applies to 215/45R20 and 245/40R20 across every year shown, from 2014 through 2020. There is no rim diameter change within this year range, so the fitment distinction comes from tire width and aspect ratio rather than a shift to a different wheel diameter.

Even with that consistency, it is still worth confirming the wheel on the actual car before replacement, especially on a model that may have seen aftermarket wheel or tire changes. Matching the correct 20-inch diameter is mandatory, but matching the correct axle-specific size is what completes a proper BMW i8 tire selection.

A 2015 BMW i8 can use 215/45R20 and 245/40R20, so year alone is not enough to choose the correct tire. The right way to confirm fitment is to check the sidewall of the tire currently mounted on the specific wheel position you are replacing and verify that the wheel is a 20-inch rim. That gives you the exact size already matched to that axle.

This matters most when replacing only one pair, because the narrower and wider BMW i8 sizes are not interchangeable front to rear. If the car has changed hands or has had wheel work done, compare the sidewall marking on both axles before selecting a replacement so the staggered layout stays correct.

The listed BMW i8 products in 245/40R20 include Blackwall, RWL, and Redline sidewall styles. Blackwall is the most modern and understated appearance, while RWL adds raised white letters and Redline adds a colored accent ring. All of the listed products in this size are radial tires on 20-inch rims.

Sidewall choice affects appearance more than fitment, but it can noticeably change the visual character of BMW i8. Owners who want a cleaner contemporary look will usually lean toward Blackwall, while those building a more customized presentation may prefer RWL or Redline if that style suits the car's overall theme.

The listed BMW i8 products are offered by BFGoodrich, Nitto, and Pro-Trac. Those brands appear in the available 245/40R20 size, with multiple radial performance-oriented product lines represented. Each of the listed options uses a 20-inch rim diameter and radial construction.

Brand choice usually comes down to the look you want, the driving character you prefer, and whether you want a more conventional black sidewall or a specialty sidewall style. Once you confirm the axle position and size on BMW i8, you can compare within the correct size rather than cross-shopping a front size against a rear size.

The listed BMW i8 tire series include g-Force Comp 2 AS, Nitto NT555 G2, g-Force Phenom T/A, and Street Pro III. All of them are radial tires in the available 245/40R20 size, but they represent different product families and visual presentations, including standard Blackwall as well as RWL and Redline variations in the Street Pro III line. The construction type does not split here, since every listed product is radial.

That means your decision is less about bias-ply versus radial and more about matching the right size with the brand family and sidewall look that suits your BMW i8. Start with axle position and size confirmation, then narrow the choice by appearance and the overall driving style you want from a modern collector-performance tire.

A BMW i8 should be stored on a clean, dry surface away from direct sunlight, electric motors, welders, or ozone-producing equipment that can age the rubber. Keeping the tires inflated to an appropriate stored pressure and moving the car occasionally helps reduce flat-spotting. If the car will sit for an extended period, a stable indoor environment matters more than anything else.

Modern low-profile radials such as the BMW i8 sizes can develop temporary shape changes when left motionless for long stretches. Owners who drive the car only occasionally should make a habit of short periodic movement, careful pressure checks, and visual sidewall inspection so the tires remain ready for road use instead of simply looking good in storage.

Tires on a BMW i8 should be inspected at least before every meaningful drive and more thoroughly several times a year, even if the car sees limited mileage. Check air pressure, tread condition, sidewall cracking, impact damage, and any signs of irregular wear across the contact patch. On a staggered setup, inspect each axle separately because the front and rear tires are different sizes and can wear differently.

Collector cars often age their tires by time and storage conditions rather than by mileage alone. A careful pre-drive walkaround on BMW i8 is worthwhile because low-use cars can hide underinflation, shoulder wear, or age-related deterioration that is easy to miss until the car is back on the road.

BMW i8 tires should be replaced whenever they show age cracking, impact damage, bulges, puncture-related structural concerns, or persistent vibration, even if the tread still appears deep. Tread depth by itself is not the only measure of serviceability on a modern collector car. A tire can look presentable and still be past its best from age, heat cycling, or long stationary storage.

That is especially important on BMW i8 because the car's performance and chassis balance depend on healthy tires at both ends of the staggered setup. If there is any doubt about age or condition, have the tires evaluated by a specialist who understands performance radials on low-use collector vehicles rather than relying on appearance alone.

The listed BMW i8 tire products are modern radial tires sized for 20-inch rims, so they are intended for road use when properly fitted, correctly inflated, and in sound condition. Safety depends on matching the correct size to the correct axle, maintaining proper pressure, and making sure the tire itself is free from age or impact damage. A staggered-performance car is less forgiving of size mistakes than a square setup.

That means a buyer should treat size accuracy and condition as equal priorities. On BMW i8, the right tire installed in the wrong position can be just as problematic as an aged or damaged tire in the correct size, so a roadworthiness check should include both fitment confirmation and a careful condition inspection.

Before driving a BMW i8, check cold tire pressures, inspect each sidewall for cuts or cracking, look for nails or embedded debris, and confirm that the correct 20-inch tire sizes are mounted on the correct axles. Also watch for uneven wear that could suggest alignment or suspension issues. Because the car uses two different tire sizes, each axle deserves its own quick inspection rather than a casual glance.

This routine is especially useful on a car that may sit between drives. A few minutes spent checking the BMW i8 tires can catch underinflation, road damage, or a mismatched replacement before it affects handling, braking feel, or the overall balance the car was designed to have.

Appropriate speed for a BMW i8 always depends on the exact tire fitted, its service condition, and the speed rating marked on the sidewall of that individual tire. The listed products include performance-oriented radial tires, but no collector car should be driven to the edge of a tire's capability without confirming pressure, condition, and proper installation. Road, weather, and storage history matter as much as the printed size.

For practical use, treat the BMW i8 as a performance car that still benefits from a conservative approach when tires are older or the car has been stored for long periods. Smooth warm-up, steady inputs, and avoiding sustained high-speed use on questionable tires is the sensible way to protect both the car and the driver.