The 2015 BMW 640i Gran Coupe blends grand touring comfort with the low, four-door profile that defined BMW’s modern luxury performance sedans. Its tire fitment is more involved than a single-size setup, because this model appears with 18-, 19-, and 20-inch radial combinations, including staggered front and rear sizing on sport-oriented configurations. That makes the real decision less about whether radial construction is available and more about confirming the exact wheel package first. Once that is settled, the choice comes down to the right size, the correct front-to-rear pairing where required, and the tire series that best suits everyday road use, appearance, and the car’s current wheel setup.
Which Tire Size Is Right for The 2015 BMW 640i Gran Coupe
The 2015 BMW 640i Gran Coupe uses five primary tire sizes, and the right one depends on the exact wheel package and whether the car uses a square or staggered setup. Tire fitment spans 18-, 19-, and 20-inch radial sizes, so the first step is confirming both the sub-model and the wheel diameter before selecting a tire.
245/45R18 is a metric radial size with a 245-millimeter section width, a 45-series aspect ratio, and fitment for an 18-inch rim. On the 2015 BMW 640i Gran Coupe, this size represents the straightforward 18-inch radial setup used on the Base configuration rather than a staggered front-and-rear arrangement. Available choices are centered on BFGoodrich and Nitto blackwall performance radials, including g-Force and NT555 G2 series options. This size is the one to evaluate when the car retains its 18-inch wheels and the goal is staying with the proper rim diameter and overall fitment pattern.
245/40R19 is a metric radial with a 245-millimeter section width, a 40-series profile, and a 19-inch rim diameter. On the 2015 BMW 640i Gran Coupe, it serves as a front size in staggered 19-inch applications and also appears with the M Sport configuration, so it is not interchangeable with every rear position. Product choices include BFGoodrich blackwall tires across the g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A series. This size should be chosen only after confirming that the car is using the 19-inch front fitment rather than the 18-inch base wheel or the 20-inch sport package.
275/35R19 is a wider metric radial size that uses a 275-millimeter section width, a 35-series profile, and a 19-inch rim. On this BMW, it functions as the rear companion to the 245/40R19 front fitment in a staggered 19-inch setup, which means it plays a different role than the narrower front tire. BFGoodrich and Nitto both offer blackwall choices in this size, including g-Force and NT555 G2 series options. It is the correct size to review when the car has the 19-inch rear wheel package and needs the proper back-axle tire size rather than a front tire match.
245/35R20 is a metric radial size with a 245-millimeter section width, a 35-series profile, and fitment for a 20-inch wheel. On the 2015 BMW 640i Gran Coupe, this size is used in the front position for the 20-inch M Sport arrangement, so it belongs as part of a staggered setup rather than as a universal size for all four corners. Available blackwall tires include BFGoodrich g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and the Nitto NT555 G2. This is the size to evaluate when the car is equipped with the larger 20-inch front wheel package and requires the matching front fitment.
275/30R20 is a wide, low-profile metric radial with a 275-millimeter section width, a 30-series aspect ratio, and a 20-inch rim diameter. For the 2015 BMW 640i Gran Coupe, it serves as the rear tire in the 20-inch staggered M Sport setup, paired with a narrower front size rather than duplicated at all four corners. The available product choice in this size is a Nitto NT555 G2 blackwall radial. This size matters most when the car is already confirmed to have the 20-inch rear wheel package, because rear staggered fitment should always be matched to the front and wheel setup.
Tire fitment for the 2015 BMW 640i Gran Coupe varies by sub-model and by front-versus-rear wheel position on staggered setups. Checking the exact configuration matters here, because the car may use a single 18-inch size or a 19-inch or 20-inch front-and-rear pairing.
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2015 BMW 640i Gran Coupe Base
The Base model uses a 245/45R18 radial tire, giving it the simplest fitment in the range. Tire selection here centers on choosing the right 18-inch blackwall radial within the available series rather than sorting through staggered front and rear sizes.
The Base Front configuration uses 245/40R19, which places it in a staggered 19-inch setup rather than the 18-inch square arrangement. That means front tire selection should stay tied to the matching rear size and the actual 19-inch wheel package on the car.
The Base Rear configuration uses 275/35R19, the wider rear size in the 19-inch staggered arrangement. Choosing this tire starts with confirming that the rear wheels are the correct 19-inch setup and that the front tires remain matched to the intended pairing.
The M Sport model uses 245/40R19 in this fitment, so tire selection begins with confirming whether the car is on the 19-inch arrangement or the larger staggered 20-inch package. Once wheel diameter is verified, the main choice is among the available blackwall radial series in the correct size.
The M Sport Front configuration can use either 245/35R20 or 245/40R19, depending on which wheel package is on the car. That makes wheel-diameter confirmation essential before choosing a front tire, since both sizes are radial but belong to different staggered setups.
The M Sport Rear configuration can use either 275/30R20 or 275/35R19, again depending on the wheel package in service. Tire selection should follow the actual rear wheel diameter and remain matched to the corresponding front size so the staggered setup stays consistent.
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 Gran Coupe Tires for Sale
Available 2015 BMW 640i Gran Coupe tires are all blackwall radials, with choices from BFGoodrich and Nitto across the g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2 series. The main comparisons are size, wheel-package compatibility, and the series offered in each fitment.
Common questions for the 2015 BMW 640i Gran Coupe usually center on exact tire size, wheel diameter, staggered front-and-rear fitment, and how to choose among the available radial tire series. Owners also need to verify wheel setup, maintenance condition, and any modifications before road use.
Tire Size & Fitment
What tire size fits a 2015 BMW 640i Gran Coupe?
The 2015 BMW 640i Gran Coupe uses five primary tire sizes: 245/45R18, 245/40R19, 275/35R19, 245/35R20, and 275/30R20. All are radial sizes, and they do not all serve the same role. Some belong to a single 18-inch setup, while the 19-inch and 20-inch sizes appear in staggered front-and-rear arrangements.
The right choice starts with identifying the exact wheel package on the car. A square 18-inch setup calls for a different tire than a staggered 19-inch or 20-inch arrangement, so wheel diameter and front-versus-rear position both matter before selecting a replacement.
What size rim does a 2015 BMW 640i Gran Coupe use?
The 2015 BMW 640i Gran Coupe uses 18-inch, 19-inch, and 20-inch rim diameters, depending on the configuration. The 245/45R18 tire fits an 18-inch rim, the 245/40R19 and 275/35R19 sizes fit 19-inch rims, and the 245/35R20 and 275/30R20 sizes fit 20-inch rims.
Rim diameter should be confirmed before anything else, because the same model can appear with more than one wheel package. Measuring the tire sidewall, checking the wheel itself, and confirming whether the car is using a front-and-rear staggered setup will help prevent choosing the wrong size.
Why does the 2015 BMW 640i Gran Coupe have more than one tire size?
The 2015 BMW 640i Gran Coupe has more than one tire size because it was fitted with different wheel packages, including both square and staggered arrangements. The 18-inch setup uses 245/45R18, while the 19-inch and 20-inch configurations use narrower front tires and wider rear tires.
That means two cars with the same year, make, and model may not use the same tires. Looking only at the model name is not enough here; the exact sub-model, wheel diameter, and front or rear position all need to be confirmed before a tire is chosen.
Choosing the Right Tire
What should I consider when choosing a tire for a 2015 BMW 640i Gran Coupe?
Start with the exact tire size and wheel diameter, because this BMW uses several different radial fitments across 18-, 19-, and 20-inch setups. After that, compare whether the car uses a square arrangement or a staggered front-and-rear pairing, since a rear size such as 275/35R19 or 275/30R20 is not the same decision as a front tire.
Once the fitment is confirmed, compare the tire series available in that specific size. Rim-width compatibility, load figures where stated, and how the car is used for daily driving or occasional touring all help narrow the best match within the correct fitment.
What sidewall styles are available for 2015 BMW 640i Gran Coupe tires?
The available tires for the 2015 BMW 640i Gran Coupe are blackwall radials across the covered sizes. That keeps the appearance straightforward and performance-oriented, whether the car uses the 18-inch base size or one of the 19-inch or 20-inch staggered combinations.
Since sidewall treatment does not vary here, the more meaningful comparisons are tire series, brand, and the exact size required for the wheel package. Owners focused on appearance can keep a consistent blackwall presentation while still choosing among different radial lines in the proper fitment.
What brands offer tires for the 2015 BMW 640i Gran Coupe?
BFGoodrich and Nitto offer tires for the 2015 BMW 640i Gran Coupe in the covered sizes. Depending on the exact fitment, choices include BFGoodrich g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and the Nitto NT555 G2.
Brand choice should come after fitment confirmation, not before it. Some sizes have several options across both brands, while others are more limited, so the practical comparison is which series are offered in the exact front or rear size your wheel package requires.
Restoration & Appearance
Which tire should I choose for a period-style 2015 BMW 640i Gran Coupe?
A period-style approach for a 2015 BMW 640i Gran Coupe usually starts with retaining the wheel diameter and tire size that belong to the car’s actual setup. Since this model uses modern radial fitments, the most faithful visual direction is typically the correct size in a blackwall radial rather than changing to a different format.
Appearance should still follow the specific configuration on the vehicle. Keeping the proper 18-inch, 19-inch, or 20-inch sizing and preserving the intended front-to-rear relationship on staggered setups will do more for an authentic look than choosing a tire based only on brand or series name.
Does correct tire fitment matter for a 2015 BMW 640i Gran Coupe restoration?
Correct tire fitment matters because the 2015 BMW 640i Gran Coupe was built around distinct wheel-package combinations rather than one universal size. Using the proper diameter and, where applicable, the correct staggered front-and-rear pairing helps preserve the car’s visual balance and keeps the setup aligned with its intended proportions.
That is especially important if the car is being returned to a stock-style presentation. Before replacing tires, verify the wheels currently on the car and make sure a previous owner has not changed the diameter or arrangement from the original package you intend to maintain.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 BMW 640i Gran Coupe?
Yes. Modifications such as aftermarket wheels, suspension changes, altered ride height, or non-original wheel offsets can change tire fitment on a 2015 BMW 640i Gran Coupe. That matters even more on this model because several tire sizes are already tied to specific wheel diameters and staggered front-and-rear arrangements.
A car that originally used 245/40R19 and 275/35R19 may no longer have those exact wheel dimensions in place. Checking wheel width, offset, steering clearance, and rear fender clearance before installing new tires is the safest way to avoid selecting a size that no longer matches the setup.
What should I inspect before driving a 2015 BMW 640i Gran Coupe on new tires?
Before road use, inspect the wheel condition, confirm the tire sizes match the correct position on the car, and check that inflation is set appropriately for the application. It also helps to verify that all four tires are seated properly and that the front and rear sizes are not mixed on a staggered setup.
A short visual inspection after installation is worthwhile as well. Look for any contact issues at full steering lock, uneven stance that suggests a suspension problem, and early signs of air loss. Those checks are especially important when the car uses 19-inch or 20-inch low-profile tires.
How often should tires on a 2015 BMW 640i Gran Coupe be inspected?
Tires on a 2015 BMW 640i Gran Coupe should be inspected regularly, not just at replacement time. Routine checks should include tread condition, uneven wear, cuts, bulges, cracking, and air pressure, especially because low-profile radial sizes can react noticeably to alignment or pressure issues.
Owners who drive the car occasionally should still inspect the tires before longer trips and after extended storage. A vehicle that sits can develop age-related condition issues even when tread depth looks acceptable, so visual condition and pressure stability matter just as much as mileage.
