The 2015 BMW 640i xDrive Gran Coupe blends the long-roof elegance and four-door practicality of BMW’s 6 Series Gran Coupe with all-wheel-drive traction and a distinctly modern grand-touring character. It is a car that depends heavily on the right wheel-and-tire package, because this exact model uses multiple radial tire sizes across 18-, 19-, and 20-inch fitments, including staggered front and rear combinations. That makes the real decision less about vintage-style construction and more about confirming the correct setup, then choosing among available blackwall performance-oriented series from BFGoodrich and Nitto. For owners focused on road manners, appearance, or replacement after wheel changes, exact size and position matter first.
Which Tire Size Is Right for The 2015 BMW 640i xDrive Gran Coupe
The 2015 BMW 640i xDrive Gran Coupe uses five primary tire sizes, and the right one depends on the exact sub-model and whether the car is running a square or staggered wheel setup. Rim diameter is the first thing to confirm, since this model appears with 18-, 19-, and 20-inch fitments, and the front and rear sizes can differ on certain configurations.
245/45R18 is a metric radial size in which 245 identifies nominal section width in millimeters, 45 is the aspect ratio, R denotes radial construction, and 18 is the wheel diameter in inches. On the 2015 BMW 640i xDrive Gran Coupe, this size is used on the Base configuration and represents the 18-inch fitment. Available choices center on blackwall performance-oriented tires from BFGoodrich and Nitto, including g-Force and NT555 G2 series options. This size is the one to evaluate when the car retains its 18-inch wheel package and is not running the larger staggered arrangements.
245/40R19 is a metric radial size with a 245-millimeter nominal section width, a 40-series profile, and a 19-inch rim diameter. On this BMW, it serves as a front-position size in staggered 19-inch applications and also appears on certain M Sport and Base Front fitments. Product choices in this size include blackwall BFGoodrich g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A options. This is the correct size to evaluate only after confirming that the car uses the 19-inch front setup rather than the 18-inch square package or 20-inch M Sport arrangement.
275/35R19 is a wider metric radial size, with 275 indicating nominal section width in millimeters, 35 as the aspect ratio, and 19 as the rim diameter. On the 2015 BMW 640i xDrive Gran Coupe, it is the rear companion to the 245/40R19 front size on staggered 19-inch setups. Available blackwall choices include BFGoodrich g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and the Nitto NT555 G2. This size should be chosen only for the rear position on the applicable 19-inch staggered configuration, not as a universal fitment across the model line.
245/35R20 is a low-profile metric radial size that combines a 245-millimeter nominal section width with a 35-series aspect ratio on a 20-inch wheel. On this model, it is used as the front size in the 20-inch M Sport staggered setup. Buyers will find blackwall options from BFGoodrich and Nitto, including g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2 series tires. This size becomes relevant when the car is equipped with the 20-inch front wheel package and the owner wants to preserve that lower-profile, larger-diameter presentation.
275/30R20 is the widest and lowest-profile primary size used here, pairing a 275-millimeter nominal section width with a 30-series profile on a 20-inch rim. On the 2015 BMW 640i xDrive Gran Coupe, it serves as the rear tire size for the 20-inch M Sport staggered arrangement. The available product choice in this size is a blackwall Nitto NT555 G2 radial. This size should only be considered after confirming a 20-inch rear wheel setup, since it is position-specific and not interchangeable with the narrower front fitments.
Fitment on the 2015 BMW 640i xDrive Gran Coupe is not the same across every covered sub-model. Checking the exact configuration matters because this model appears with an 18-inch square setup, a 19-inch staggered arrangement, and an M Sport package that can move to a 20-inch front-and-rear combination.
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2015 BMW 640i xDrive Gran Coupe Base
The Base model uses the 245/45R18 radial size, making it the straightforward 18-inch fitment within this lineup. Tire selection here is mainly about choosing among the available blackwall product series while confirming that the car still carries its original wheel diameter.
The Base Front configuration uses 245/40R19, which places it in the 19-inch staggered setup rather than the 18-inch square arrangement. That means front-position fitment needs to be matched carefully to the corresponding rear size and wheel package before selecting a tire.
The Base Rear configuration uses 275/35R19, the wider rear size paired with the 19-inch front fitment. Rear-tire selection should stay aligned with the staggered setup, especially if the car has seen wheel changes or replacement tires installed one axle at a time.
The M Sport designation appears with a 245/40R19 radial fitment in this coverage, tying it to the 19-inch size family. The key here is verifying whether the car remains on that setup or has the larger M Sport front-and-rear wheel package before choosing replacement tires.
M Sport Front can use either 245/35R20 or 245/40R19, so wheel diameter has to be confirmed before any purchase decision. Once that is settled, the choice becomes selecting the right blackwall radial within the correct front-position size.
M Sport Rear can use either 275/30R20 or 275/35R19, again making wheel diameter the first thing to verify. Rear fitment on this setup is staggered, so the tire needs to match both the wheel and the front-and-rear combination already on the car.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 2015 BMW 640i xDrive Gran Coupe Tires for Sale
Available tires for the 2015 BMW 640i xDrive Gran Coupe focus on modern blackwall radial performance options from BFGoodrich and Nitto. Depending on size, buyers can compare g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2 series choices across the 18-, 19-, and 20-inch fitments.
Owners of a 2015 BMW 640i xDrive Gran Coupe usually need clarity on exact tire size, front-versus-rear fitment, wheel diameter, and how to choose among the available radial performance options. These FAQs also cover appearance, replacement planning, and key checks before road use.
Tire Size & Fitment
What tire size fits a 2015 BMW 640i xDrive Gran Coupe?
The 2015 BMW 640i xDrive Gran Coupe uses several primary tire sizes: 245/45R18, 245/40R19, 275/35R19, 245/35R20, and 275/30R20. All are radial sizes, and they correspond to different wheel packages and, in some cases, front-versus-rear positions on staggered setups.
The right choice starts with identifying the exact configuration on the car. A Base model can use the 18-inch 245/45R18 size, while 19-inch and 20-inch arrangements use separate front and rear sizes. Checking the current wheel diameter and whether the car has a staggered setup prevents choosing a tire that matches the model name but not the actual wheels.
What size rim does a 2015 BMW 640i xDrive Gran Coupe use?
The 2015 BMW 640i xDrive Gran Coupe appears with 18-inch, 19-inch, and 20-inch rim diameters. The 245/45R18 size uses an 18-inch rim, the 245/40R19 and 275/35R19 sizes use 19-inch rims, and the 245/35R20 and 275/30R20 sizes use 20-inch rims.
That makes rim diameter the first fitment check before comparing brands or tire series. A 19-inch front tire and a 20-inch front tire may look similar in overall stance, but they do not mount to the same wheel. On a car that has changed hands or seen aftermarket wheels, reading the wheel and tire size already installed is the safest place to start.
Why does the 2015 BMW 640i xDrive Gran Coupe have more than one tire size?
This model has more than one tire size because it was fitted with different wheel packages, including an 18-inch setup and staggered 19-inch or 20-inch arrangements. On the staggered combinations, the front and rear tires are different widths and profiles, so two sizes are used on the same car.
That means the model name alone is not enough to choose a replacement tire. The owner needs to confirm whether the car has a square setup or a front-and-rear stagger, then match the exact rim diameter and axle position. That extra step matters even more if wheels, suspension height, or previous replacement choices have altered the original setup.
Choosing the Right Tire
What should I consider when choosing a tire for a 2015 BMW 640i xDrive Gran Coupe?
Start with the exact tire size, wheel diameter, and whether the car uses the same size front and rear or a staggered setup. Every primary fitment on the 2015 BMW 640i xDrive Gran Coupe is radial, so the main comparison is between the correct size options rather than between vintage construction types.
After size is confirmed, compare the available tire series, brand, rim-width compatibility, and load figures where they are stated. A Base model on 245/45R18 raises different selection questions than an M Sport rear on 275/30R20. The right tire is the one that matches the actual wheel package and the owner’s intended balance of everyday road use, appearance, and replacement consistency.
What brands offer tires for the 2015 BMW 640i xDrive Gran Coupe?
BFGoodrich and Nitto both offer tires for the 2015 BMW 640i xDrive Gran Coupe. Depending on size, the available choices include BFGoodrich g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A tires, along with Nitto NT555 G2 options.
Brand choice should come after size and wheel confirmation, not before. Some sizes offer several BFGoodrich and Nitto choices, while others are much narrower in selection, including a single Nitto option in 275/30R20. Looking at the exact size first helps narrow the meaningful comparisons to the products that actually suit the car’s front or rear position.
What tire series are available for the 2015 BMW 640i xDrive Gran Coupe?
Available tire series for this BMW include BFGoodrich g-Force Comp 2 AS, BFGoodrich g-Force Sport Comp 2, BFGoodrich g-Force Phenom T/A, and Nitto NT555 G2. These series appear across the covered 18-inch, 19-inch, and 20-inch sizes, although not every series is offered in every fitment.
That makes the series name a useful comparison point once the correct size is settled. Owners replacing a matched set may want to stay consistent front to rear when possible, while those replacing a single axle should verify how the series, load capacity, and rim-width specifications compare within that exact size. The goal is a properly matched tire choice, not just a familiar series name.
Restoration & Appearance
Which tire should I choose for a period-style 2015 BMW 640i xDrive Gran Coupe?
A period-style approach on a 2015 BMW 640i xDrive Gran Coupe starts with keeping the car on its correct wheel diameter and matching front-and-rear sizing if it uses a staggered setup. Since this is a modern radial-fitment car, the appearance question is less about bias-ply style and more about preserving the proper stance and proportions.
Blackwall tires are the available sidewall treatment across these fitments, which suits the car’s contemporary grand-touring character. Owners aiming for a presentation close to the car’s original visual intent should avoid substituting a different profile or wheel diameter without checking how that changes the look. Consistent sizing across both axles matters as much as the brand or series name.
Does correct tire fitment matter for a 2015 BMW 640i xDrive Gran Coupe restoration?
Correct tire fitment matters on a 2015 BMW 640i xDrive Gran Coupe because wheel diameter, tire profile, and staggered front-and-rear sizing all affect how the car sits and presents. Using the right size family helps preserve the proportions intended for the Base or M Sport setup rather than giving the car a mismatched appearance.
For restoration-oriented work, the first priority is confirming what wheel package belongs on the specific car today. A visually close substitute in the wrong diameter or axle position can alter the stance even if the tire mounts successfully. When originality is especially important, the best path is to match the actual configuration on the vehicle before comparing series or brand options.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 BMW 640i xDrive Gran Coupe?
Yes. Wheel changes, offset differences, suspension alterations, or a switch between 18-, 19-, and 20-inch packages can all affect tire fitment on a 2015 BMW 640i xDrive Gran Coupe. That matters even more on staggered combinations, where front and rear sizes are intentionally different and cannot be treated as a one-size-fits-all setup.
A car with aftermarket wheels should have its actual wheel diameter and width checked before a replacement tire is chosen. Clearance at the fenders, suspension, and steering also deserves attention, especially with wider rear sizes and lower-profile 20-inch tires. Matching the model year alone is not enough once the original wheel-and-suspension setup has been changed.
What should I inspect before driving a 2015 BMW 640i xDrive Gran Coupe on new tires?
Before road use, inspect tire pressure, bead seating, tread and sidewall condition, and the front-and-rear size placement. On a 2015 BMW 640i xDrive Gran Coupe, it is especially important to confirm that staggered setups have the correct front tire on the front axle and the correct rear tire on the rear axle.
A quick visual check should also include wheel condition, valve stems, and any signs of rubbing at full steering lock or over suspension movement. After installation, recheck pressures and pay attention to how the car tracks and responds. Even with the correct listed size, a wheel change or previous modification can create issues that only show up once the car is back on the road.
How often should tires on a 2015 BMW 640i xDrive Gran Coupe be inspected?
Tires on a 2015 BMW 640i xDrive Gran Coupe should be inspected regularly, not just when tread looks low. Pressure, uneven wear, cuts, bulges, and sidewall cracking are all worth checking, and the inspection should include both axles because this model can use different front and rear sizes.
Cars that see occasional use deserve extra attention because age and air loss can become issues long before tread is worn out. A quick routine check before longer drives is a smart habit, especially on low-profile 19-inch and 20-inch fitments. Keeping an eye on condition and wear pattern also helps reveal alignment, wheel, or suspension problems before they become more serious.
