BMW 640i Tires

BMW 640i models from 2012 through 2018 use six tire sizes: 245/45R18, 245/35R20, 245/40R19, 275/30R20, 275/35R19, and 275/40R18. The 245-width sizes are the narrower front fitments, while the 275-width sizes are the wider rear fitments. All are radial tires, and the rim diameters used across the range are 18, 19, and 20 inches. The 275/40R18 rear size appears only for 2012 and 2013, while the other five sizes span the full production run.

That means year alone is not enough to choose correctly for a BMW 640i. You need to confirm the actual wheel package on the car and check whether you are replacing front tires, rear tires, or a complete staggered set. The safest approach is to read the size from each tire currently on the car and compare it against the year listing so the front and rear fitments stay properly matched.

A 2012 BMW 640i has six tire sizes listed because that year could be equipped with multiple staggered wheel packages rather than one single setup. The sizes break into three front options and three rear options: 18-inch, 19-inch, and 20-inch combinations. The split is driven by wheel-package differences, not by one tire size fitting every 2012 BMW 640i.

What matters in the garage is identifying the exact combination on the car. An 18-inch setup uses different front and rear sizes than a 19-inch or 20-inch setup, and mixing those packages creates immediate fitment problems. Check the wheel diameter cast or stamped on the wheel, then confirm the tire size on both axles before selecting replacements for a 2012 BMW 640i.

BMW 640i models in this range use 18-inch, 19-inch, and 20-inch rim diameters. The 18-inch fitments are 245/45R18 at the front and, on 2012-2013 cars, 275/40R18 at the rear. The 19-inch fitments are 245/40R19 front and 275/35R19 rear, while the 20-inch fitments are 245/35R20 front and 275/30R20 rear.

Wheel diameter is the first physical check because a tire cannot be mounted on the wrong rim size even if the year seems correct. On a BMW 640i, the rim diameter also tells you which staggered package the car is using. Once you confirm whether the wheels are 18, 19, or 20 inches, the correct front and rear tire sizes narrow down quickly.

On a BMW 640i, 245/35R20 means the tire is 245 millimeters wide, the sidewall height is 35 percent of that width, the R indicates radial construction, and the tire fits a 20-inch wheel. It is one of the front-size fitments used across 2012 through 2018. The shorter 35-series sidewall reflects the lower-profile character of the 20-inch wheel package.

Reading the code correctly helps prevent accidental substitutions between wheel packages. A 245/35R20 front tire is not interchangeable with the 245/40R19 or 245/45R18 front sizes because the rim diameter and sidewall proportions differ. On a BMW 640i, always match the full size code exactly unless a marque specialist has specified a deliberate change for the car.

A 2016 BMW 640i can use front sizes 245/45R18, 245/40R19, or 245/35R20, paired with rear sizes 275/35R19 or 275/30R20 depending on the wheel package. The correct choice comes from the actual wheel and tire combination on the car, not from the year alone. Reading the size molded into the current front and rear tires is the quickest way to verify it.

After confirming the size, compare the wheel diameter so the replacement tire matches the rim exactly. A BMW 640i commonly uses a staggered setup, so the front and rear sizes are intentionally different. Replace like for like unless the car is being deliberately reconfigured, and if it has aftermarket wheels, use the actual tire and wheel measurements instead of relying on the factory year grouping.

BMW 640i tires in this range are offered primarily as blackwall radials. One rear size, 275/40R18, also appears with redline and RWL sidewall styles in the Pro-Trac Street Pro III series. That makes the 18-inch rear fitment used on 2012 and 2013 cars the only place in this range where sidewall appearance varies beyond standard blackwall.

For most BMW 640i owners, blackwall remains the straightforward visual match for a modern grand touring car. The redline and raised white letter options are more of a style choice and should be considered carefully against the car's overall presentation. Before selecting a non-blackwall option, confirm that the car actually uses the 275/40R18 rear size, since those sidewall treatments do not carry across the full BMW 640i range.

BMW 640i tires in these sizes come from BFGoodrich, Nitto, and Pro-Trac. BFGoodrich appears across several front and rear fitments with the g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A series. Nitto is represented by the NT555 G2, and Pro-Trac appears in the 275/40R18 rear size with the Street Pro III series.

Brand choice should come after size and wheel-package verification, not before. A BMW 640i owner may find more brand options in some sizes than others, especially between front and rear applications. Once the exact fitment is confirmed, the available brands can then be narrowed by the look you want, the tire series you prefer, and whether you are replacing a full staggered set or only one axle.

BMW 640i tires here include BFGoodrich g-Force Comp 2 AS, BFGoodrich g-Force Sport Comp 2, BFGoodrich g-Force Phenom T/A, Nitto NT555 G2, and Pro-Trac Street Pro III. Those series represent different modern radial performance approaches rather than vintage construction types. Some sizes carry multiple series choices, while others, such as 275/30R20, are much more limited.

The practical difference for a BMW 640i owner is that the exact size may determine the series options more than the model name does. If you are replacing two tires on one axle, try to keep the same series on that axle for consistent behavior. If you are replacing a complete set, compare the available series within your confirmed front and rear sizes and choose the combination that best suits how the car is actually driven.

A stored BMW 640i should be kept in a cool, dry, dark space away from direct sunlight, ozone sources, and large temperature swings. Clean the tires first, avoid parking on contaminated concrete, and keep the car at normal tire pressure while stored. If the car will sit for extended periods, moving it occasionally or supporting it to reduce prolonged flat spotting is helpful.

Modern low-profile radial tires on a BMW 640i can develop temporary flat spotting if the car sits too long in one place. That matters even more on staggered wheel packages because replacement options can differ between front and rear sizes. Regularly checking inflation and changing the tire contact patch during storage helps preserve ride quality and reduces the chance of vibration when the car goes back on the road.

Tires on a BMW 640i should be visually inspected before regular driving and given a closer check several times through the season, especially on a collector or low-mileage car. Look for cracking, punctures, sidewall bulges, uneven shoulder wear, and any sign that the front and rear tires are wearing differently. Pressure should also be checked routinely, because underinflation is especially hard on low-profile radial tires.

Frequent inspection matters because a BMW 640i often runs staggered sizes that cannot simply be rotated front to rear to even out wear. A small alignment or pressure problem may show up first on only one axle. Catching that early protects the tires you already have and helps you decide whether a single-axle replacement is appropriate or whether the car needs a broader suspension and alignment review.

Tires on a BMW 640i should be replaced when they show age cracking, impact damage, separations, persistent vibration, or other structural concerns, even if the tread still looks usable. Collector and pleasure-use cars often age their tires out before they wear them out. That is especially important on performance-oriented radial tires with short sidewalls, where age and storage history can matter as much as remaining tread depth.

The key is to judge the tire as a whole, not just the tread face. If a BMW 640i has been driven infrequently, the owner should treat sidewall condition, ride quality, and age as serious replacement factors. A professional inspection is worthwhile any time a tire shows cracking, impact marks, or unexplained air loss, because preserving correct handling on a staggered BMW setup depends on tire condition as much as tire size.

BMW 640i models in this 2012-2018 range were fitted within a group of modern metric radial sizes rather than a single universal tire. The fitment spread includes 18-, 19-, and 20-inch front and rear combinations, with 245-width front tires and 275-width rear tires. That means originality depends first on confirming which wheel package the specific BMW 640i carried when new.

For an originality-minded owner, the best reference is the car itself along with factory labels, original paperwork, or marque records tied to that VIN or build configuration. A BMW 640i restored with the wrong wheel-package tire size may still mount correctly if the wheels match, but it will not reflect the car's original configuration. Authenticity on this model is about matching the correct staggered package, not chasing a period bias-ply look.

Correct tire fitment can affect both presentation and credibility on a BMW 640i, especially when the car is preserved or restored as a factory-style example. Judges and knowledgeable buyers notice whether the wheel diameter, front-to-rear stagger, and overall stance match the car's intended configuration. Even on a modern classic, the wrong aspect ratio or a mismatched rear size can change the look immediately.

For owners concerned with value, the smart move is to keep the tire sizes consistent with the wheel package the car was built with or with a clearly understood period of ownership history. If the BMW 640i has aftermarket wheels, preserve records of the original setup so the car can be returned to factory-style proportions later. Marque clubs and BMW specialists remain the best reference for judging-level presentation.

Blackwall is the prevailing sidewall style across BMW 640i tire offerings in this range and is the closest visual match for the model's contemporary grand touring character. The only alternate sidewall treatments listed here are redline and RWL, both in the 275/40R18 rear size. Those alternatives apply only to an early 18-inch rear fitment and are not spread across the full BMW 640i lineup.

If the goal is a factory-style restoration or preservation, blackwall is the most straightforward choice. A redline or raised white letter rear tire may suit a personalized build, but it changes the visual language of the car more than many owners expect. Before using an alternate sidewall on a BMW 640i, confirm that the car uses the 275/40R18 rear size and decide whether appearance or factory-style presentation is the priority.

These BMW 640i tires are modern radial designs intended for road use in the sizes listed, provided they are mounted correctly, in sound condition, and matched to the proper wheel diameter. Safety depends on using the exact front and rear sizes required by the car's wheel package and keeping the tires in good structural condition. A correct-size tire on the wrong axle or rim is not a safe substitute.

Before regular road use, inspect the tires carefully and confirm that the staggered setup has been preserved correctly. A BMW 640i can be very sensitive to mismatched sizes, uneven wear, and damaged low-profile sidewalls. If the car has recently been purchased or has unknown maintenance history, a full tire and wheel inspection is a sensible first step before sustained highway driving.

Before driving a BMW 640i, check tire pressure, visible condition, tread depth, and whether the front and rear sizes match the wheel package actually on the car. Also look for cuts, sidewall bubbles, cracking, and any sign that one tire has been replaced with a different size or profile. On this model, the staggered arrangement makes size mismatches especially important to catch early.

A brief walkaround can prevent most avoidable tire problems. Because BMW 640i fitments span 18-, 19-, and 20-inch combinations, even one incorrect tire can upset balance, appearance, and handling. If the steering feels off, the car pulls, or the ride is suddenly harsh, stop and recheck the tires before continuing, since those symptoms often show up before a more obvious tire failure.

A BMW 640i should only be driven at speeds appropriate to the exact tires fitted, their condition, and the condition of the car as a whole. The sizes listed here are modern radial fitments, but speed capability still depends on using a properly matched, undamaged tire with correct inflation. Age, storage history, and prior impact damage can reduce real-world confidence long before the tread is gone.

In practical terms, a BMW 640i owner should think conservatively if the tires are older, the service history is uncertain, or the car has sat for long periods. Smooth, moderate driving is the right starting point until the tires and alignment have proven themselves. High-speed touring is part of the BMW 640i character, but only a fresh, correctly fitted, well-inspected set should be trusted to deliver it safely.