The 2015 BMW Alpina B6 xDrive Gran Coupe blends the long-roofless profile of BMW’s 6 Series Gran Coupe with Alpina’s traditional focus on high-speed grand touring and understated performance. It is a modern collector-era performance sedan-coupe where wheel and tire fitment play a major role in preserving the car’s balance, stance, and road manners. This application uses radial tires, with 245/40R19 on the Base setup and a staggered 20-inch arrangement of 245/35R20 front and 275/30R20 rear. Available choices center on blackwall performance radials from BFGoodrich and Nitto, so the real decision is matching the correct size and wheel setup to the way the car is actually configured.
Which Tire Size Is Right for The 2015 BMW Alpina B6 xDrive Gran Coupe
The 2015 BMW Alpina B6 xDrive Gran Coupe uses three primary tire sizes, and the right one depends on the exact wheel position and setup. One fitment uses a 19-inch rim, while the staggered performance arrangement uses 20-inch front and rear sizes, so confirming both the sub-model description and actual wheel diameter comes first before comparing tire choices.
245/40R19 is a metric radial size in which 245 identifies the nominal section width in millimeters, 40 is the aspect ratio, R denotes radial construction, and 19 is the rim diameter in inches. On this application, it is a modern radial fitment for the 19-inch wheel setup rather than the staggered 20-inch arrangement. Available choices center on BFGoodrich blackwall performance tires in the g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A series. This size is the one to evaluate when the car has 19-inch wheels and the goal is staying with the proper overall fitment character for that configuration.
245/35R20 is a metric radial size with a 245-millimeter nominal section width, a 35-series profile, and a 20-inch rim diameter. On the 2015 BMW Alpina B6 xDrive Gran Coupe, this size serves the front position on the staggered 20-inch setup, so it should not be treated as a universal fitment for every wheel location. Product choices include blackwall radial performance tires from BFGoodrich and Nitto, with series such as g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2. This is the size to compare when the front wheels are 20-inch and the car retains its staggered layout.
275/30R20 is a metric radial size where 275 indicates nominal section width in millimeters, 30 is the aspect ratio, and 20 is the rim diameter in inches. Here it functions as the rear tire size on the staggered 20-inch arrangement, giving the rear axle a wider tire than the front. The available product choice in this size is a blackwall Nitto NT555 G2 radial, which keeps the selection focused and straightforward. This size matters when confirming the car still uses the factory-style staggered wheel layout rather than a square setup or aftermarket wheel package.
2015 BMW Alpina B6 xDrive Gran Coupe Sub-Model Tires
Fitment varies by how this application is broken out, so checking the exact sub-model and wheel position matters before choosing a tire. The key distinction is between the 19-inch Base setup and the staggered 20-inch front and rear arrangement.
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2015 BMW Alpina B6 xDrive Gran Coupe Base
The Base fitment uses the 245/40R19 radial size on a 19-inch wheel setup. Tire selection here is mainly about choosing among available blackwall performance radial series while confirming that the car has not been converted to the staggered 20-inch arrangement.
The Base Front position uses 245/35R20 as part of the staggered 20-inch setup. That makes front-wheel confirmation important, especially on cars that may have had wheel changes, because this size should be matched to the correct front axle position rather than used generically.
The Base Rear position uses the wider 275/30R20 radial size on the 20-inch staggered setup. Tire choice at the rear is more focused, so the main task is confirming wheel diameter and preserving the intended front-to-rear size relationship on the vehicle.
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 Alpina B6 xDrive Gran Coupe Tires for Sale
Available choices for the 2015 BMW Alpina B6 xDrive Gran Coupe center on blackwall radial performance tires from BFGoodrich and Nitto. Depending on size, the product grid highlights differences in tire series, wheel-position fitment, and rim-width compatibility on the 19-inch and 20-inch applications.
Owners of a 2015 BMW Alpina B6 xDrive Gran Coupe usually need clarity on size by wheel position, 19-inch versus 20-inch fitment, brand and series differences, and the inspections worth making before road use on a high-performance grand touring car.
Tire Size & Fitment
What tire size fits a 2015 BMW Alpina B6 xDrive Gran Coupe?
The 2015 BMW Alpina B6 xDrive Gran Coupe uses three primary tire sizes: 245/40R19, 245/35R20, and 275/30R20. The 245/40R19 size applies to the Base setup, while the 20-inch arrangement is staggered, using 245/35R20 in front and 275/30R20 in the rear.
That means the first step is confirming whether the car has 19-inch wheels or the staggered 20-inch setup, then confirming front versus rear position on the 20-inch application. A tire that is right in size for one wheel position should not be assumed correct for the others, especially on a performance-oriented Alpina configuration.
What size rim does a 2015 BMW Alpina B6 xDrive Gran Coupe use?
The 2015 BMW Alpina B6 xDrive Gran Coupe uses both 19-inch and 20-inch rim diameters, depending on the fitment. The 245/40R19 size mounts on a 19-inch rim, while the 245/35R20 front and 275/30R20 rear sizes both use 20-inch rims.
Wheel diameter is the first fitment detail to verify before selecting tires, because a 19-inch tire and a 20-inch tire are not interchangeable. It also helps to confirm whether the car still has its original wheel arrangement or has been changed to an aftermarket setup, since that can affect both the usable tire size and the proper front-to-rear combination.
Why does the 2015 BMW Alpina B6 xDrive Gran Coupe have more than one tire size?
More than one tire size appears because this application includes both a 19-inch setup and a staggered 20-inch setup. In the staggered arrangement, the front uses 245/35R20 and the rear uses the wider 275/30R20, which is a common performance layout on high-output grand touring cars.
That difference matters because the correct tire is tied to the exact wheel package and axle position, not just the vehicle name. Before choosing tires, check the wheel diameter and read the sidewall on the tires already mounted, then compare that against the front and rear setup so the car keeps the intended fitment balance.
Choosing the Right Tire
What should I consider when choosing a tire for a 2015 BMW Alpina B6 xDrive Gran Coupe?
Start with the correct size for the exact setup: 245/40R19 for the 19-inch application, or 245/35R20 front and 275/30R20 rear for the staggered 20-inch arrangement. From there, compare radial construction details, tire series, and any stated rim-width guidance on the available products.
This car rewards careful fitment because the wrong size or wheel-position mismatch can upset the balance of a high-performance grand touring chassis. It helps to think about how the car is used as well, since some available tires emphasize summer-style performance character while others broaden the use case within the correct size.
What sidewall styles are available for 2015 BMW Alpina B6 xDrive Gran Coupe tires?
The available tires for the 2015 BMW Alpina B6 xDrive Gran Coupe use a blackwall sidewall style across the supported 19-inch and 20-inch sizes. That gives the car a clean, modern performance presentation that suits the understated look associated with an Alpina-based grand touring sedan-coupe.
Because the visible sidewall treatment stays consistent, the bigger selection differences come from tire size, wheel position, and tire series rather than appearance stripes or whitewall variations. Buyers comparing products should focus more on choosing the correct fitment and intended use than on sidewall styling, since the visual theme remains straightforward in this application.
What brands offer tires for the 2015 BMW Alpina B6 xDrive Gran Coupe?
BFGoodrich and Nitto both offer tires for the 2015 BMW Alpina B6 xDrive Gran Coupe. BFGoodrich appears in the 245/40R19 and 245/35R20 sizes with several g-Force series options, while Nitto appears in the 245/35R20 and 275/30R20 sizes through the NT555 G2 line.
Brand choice should be considered alongside the exact size and wheel position, because not every brand appears in every fitment on this car. A practical comparison looks at whether the tire is for the 19-inch setup or the staggered 20-inch setup first, then narrows the options by series, construction details, and any wheel-width guidance that applies.
Restoration & Appearance
Does correct tire fitment matter for a 2015 BMW Alpina B6 xDrive Gran Coupe restoration?
Correct tire fitment matters because the 2015 BMW Alpina B6 xDrive Gran Coupe relies on precise sizing to maintain its intended stance and wheel-to-body relationship. Using the proper 19-inch or staggered 20-inch sizes keeps the car visually coherent and avoids the mismatched look that comes from incorrect sidewall height or rear width.
Appearance is only part of the decision, since fitment also affects how naturally the car sits and how evenly the front and rear package works together. For a restoration-minded project, start with the correct size and wheel diameter, then choose among the available blackwall performance radial series that best suit the car’s presentation and use.
How does tire construction affect the appearance of a restored 2015 BMW Alpina B6 xDrive Gran Coupe?
This application uses radial tires, so the appearance question is less about bias-ply versus radial and more about selecting the proper modern low-profile radial size. The 245/40R19, 245/35R20, and 275/30R20 fitments define the visual character through sidewall height, wheel fill, and the front-to-rear relationship on staggered cars.
A restoration-oriented owner should avoid treating tire appearance as a purely cosmetic choice, because incorrect dimensions can quickly change the car’s stance. The most convincing result usually comes from preserving the proper wheel diameter and front-rear sizing layout first, then choosing the tire series that matches the intended road use and overall presentation.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 BMW Alpina B6 xDrive Gran Coupe?
Yes, modifications can affect tire fitment on a 2015 BMW Alpina B6 xDrive Gran Coupe. Aftermarket wheels, altered offsets, suspension changes, or a move away from the original 19-inch or staggered 20-inch setup can change the space available for the tire and alter which size works properly on the car.
A modified car should be checked at the wheel, not just by the model name. Measure the actual rim diameter and width, confirm front and rear sizes on staggered setups, and inspect clearance at the fender, inner wheelhouse, and steering range before assuming a replacement tire in the stock size will suit the current configuration.
What should I inspect before driving a 2015 BMW Alpina B6 xDrive Gran Coupe on new tires?
Before road use, inspect tire pressure, sidewall condition, tread condition, and valve-stem sealing, then confirm that each tire is mounted in the correct size and wheel position. On a staggered 20-inch setup, also verify that the 245/35R20 tires are on the front and the 275/30R20 tires are on the rear.
A quick visual check should also include clearance at full steering lock, any signs of rubbing, and general wheel condition. Since this is a high-performance grand touring application, it also makes sense to look over suspension and alignment condition, because even properly sized new tires can wear poorly or feel unsettled if the underlying chassis setup needs attention.
How often should tires on a 2015 BMW Alpina B6 xDrive Gran Coupe be inspected?
Tires on a 2015 BMW Alpina B6 xDrive Gran Coupe should be inspected regularly, especially if the car is driven infrequently or stored for part of the year. A routine check for pressure loss, uneven wear, cracking, cuts, bulges, and tread condition helps catch issues early on both the 19-inch and staggered 20-inch setups.
Performance cars can be sensitive to tire condition, so inspection should happen before longer drives and after any period of storage. It also helps to keep an eye on front-to-rear wear patterns, since staggered fitments cannot simply be treated like a square setup, and any unusual wear can point to alignment or suspension issues that need correction.
