The 2018 BMW Alpina B6 xDrive Gran Coupe blends the sleek four-door shape of BMW’s 6 Series Gran Coupe with Alpina’s distinct grand-touring character, giving owners a car that feels equally at home on a fast highway run or as part of a modern German collection. Tire choice on this exact model centers on a radial fitment with either a single 245/40R19 size or a staggered 20-inch setup using 245/35R20 in front and 275/30R20 in the rear. Available choices lean toward blackwall performance-oriented series from BFGoodrich and Nitto. The key is confirming which wheel package is on the car before comparing tread style, construction details, and road-use priorities.
Which Tire Size Is Right for The 2018 BMW Alpina B6 xDrive Gran Coupe
Three primary tire sizes apply to the 2018 BMW Alpina B6 xDrive Gran Coupe, and the right one depends first on wheel setup. One configuration uses a 19-inch rim with 245/40R19, while the staggered 20-inch arrangement uses 245/35R20 at the front and 275/30R20 at the rear. Before choosing a tire, confirm both the rim diameter and whether the car is wearing the single-size or front-and-rear staggered package.
245/40R19 is a modern metric radial size in which 245 identifies the nominal section width in millimeters, 40 is the aspect ratio, R marks radial construction, and 19 is the wheel diameter in inches. On the 2018 BMW Alpina B6 xDrive Gran Coupe, this size serves the 19-inch wheel setup and keeps the buying decision centered on performance-oriented radial choices rather than construction changes. Available options come from BFGoodrich in blackwall form across 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 is equipped with 19-inch wheels and a non-staggered fitment approach.
245/35R20 is a modern metric radial size with a 245-millimeter nominal width, a 35-series profile, radial construction, and a 20-inch rim diameter. On this BMW Alpina B6 xDrive Gran Coupe, it is used as the front size in the 20-inch staggered arrangement, so it should be considered alongside the matching rear tire rather than by itself. Product choices include blackwall 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 correct front-size starting point when the car has 20-inch wheels and a wider rear tire.
275/30R20 is a modern metric radial size where 275 designates the nominal section width in millimeters, 30 indicates the aspect ratio, R denotes radial construction, and 20 marks the wheel diameter. On the 2018 BMW Alpina B6 xDrive Gran Coupe, this is the rear tire size for the staggered 20-inch setup, giving it a different role from the narrower front tire. The available product choice in this size is a blackwall Nitto NT555 G2 radial. This size matters most when preserving the intended front-to-rear sizing relationship on cars equipped with the 20-inch staggered wheel package.
2018 BMW Alpina B6 xDrive Gran Coupe Sub-Model Tires
Sub-model fitment on the 2018 BMW Alpina B6 xDrive Gran Coupe is really a wheel-position question rather than a trim-level one. Checking whether the car has the 19-inch setup or the staggered 20-inch front-and-rear arrangement is the step that determines the correct tire selection.
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2018 BMW Alpina B6 xDrive Gran Coupe Base
The 2018 BMW Alpina B6 xDrive Gran Coupe Base uses the 245/40R19 radial size on its 19-inch wheel setup. Tire selection here is mostly about comparing available blackwall performance-oriented options within that size and confirming that the car is still on the 19-inch package.
The 2018 BMW Alpina B6 xDrive Gran Coupe Base Front uses 245/35R20 radial tires as part of the 20-inch staggered arrangement. Choosing this front size means pairing it with the correct rear size and verifying that the car has not been altered with different wheel widths or offsets.
The 2018 BMW Alpina B6 xDrive Gran Coupe Base Rear uses 275/30R20 radial tires on the rear axle of the staggered 20-inch setup. Selection at the rear is more limited, so preserving the intended front-to-rear sizing relationship and checking clearance remain especially important.
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 2018 BMW Alpina B6 xDrive Gran Coupe Tires for Sale
Available tires for the 2018 BMW Alpina B6 xDrive Gran Coupe focus on radial blackwall performance fitments from BFGoodrich and Nitto. Buyers can compare 19-inch and 20-inch options across series such as g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2.
These FAQs focus on the exact tire sizes used on the 2018 BMW Alpina B6 xDrive Gran Coupe, including wheel-package differences, staggered fitment, product selection, and the practical checks that matter before road use.
Tire Size & Fitment
What tire size fits a 2018 BMW Alpina B6 xDrive Gran Coupe?
The 2018 BMW Alpina B6 xDrive Gran Coupe uses three primary tire sizes across its covered configurations: 245/40R19, 245/35R20, and 275/30R20. The 19-inch setup uses 245/40R19, while the 20-inch staggered setup uses 245/35R20 in front and 275/30R20 in the rear.
That means the first step is identifying which wheels are actually on the car. A 19-inch non-staggered arrangement and a 20-inch staggered arrangement are not the same fitment situation, so tire selection should match the wheel diameter and the front or rear position before comparing brands, series, or load-related details.
What size rim does a 2018 BMW Alpina B6 xDrive Gran Coupe use?
The 2018 BMW Alpina B6 xDrive Gran Coupe uses either 19-inch or 20-inch rims, depending on the tire size and wheel package. The 245/40R19 tire mounts to a 19-inch rim, while both 245/35R20 and 275/30R20 are built for 20-inch rims.
Wheel diameter is the quickest way to narrow the correct tire choice, but it is not the only thing to confirm. Wheel width, front-versus-rear position, and any aftermarket wheel changes should also be checked, especially on staggered 20-inch cars where using the right size at each axle matters as much as matching the rim diameter.
Why does the 2018 BMW Alpina B6 xDrive Gran Coupe have more than one tire size?
More than one tire size appears because this model can be found with two different wheel arrangements. One uses 245/40R19, while the other uses a staggered 20-inch setup with 245/35R20 on the front and 275/30R20 on the rear.
That difference changes the buying process. Instead of choosing by year, make, and model alone, it helps to confirm whether the car has 19-inch wheels or a 20-inch staggered package, then match each axle correctly. Looking at the current tires and wheels before ordering is especially important on cars that may have been modified since new.
Choosing the Right Tire
What should I consider when choosing a 245/40R19 tire for a 2018 BMW Alpina B6 xDrive Gran Coupe?
A 245/40R19 tire for the 2018 BMW Alpina B6 xDrive Gran Coupe should first match the 19-inch wheel setup. In this size, the available choices are radial blackwall tires from BFGoodrich, including g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A.
Selection then comes down to how the car is used and which product details matter most to you. Compare the tire series, the rim-width compatibility shown for the tire, and any stated load figures or weight details. It also helps to confirm that the car still has its 19-inch wheels rather than a later change to a 20-inch staggered package.
What brands offer tires for the 2018 BMW Alpina B6 xDrive Gran Coupe?
BFGoodrich and Nitto both offer tires for the 2018 BMW Alpina B6 xDrive Gran Coupe. BFGoodrich appears across the 245/40R19 and 245/35R20 sizes, while Nitto appears in 245/35R20 and 275/30R20, including the rear tire used on the staggered 20-inch setup.
Brand choice should still come after fitment confirmation. Once the correct size and wheel position are established, compare the available series in that exact size and note whether the car needs a 19-inch all-around fitment or a front-and-rear 20-inch staggered pairing. That approach keeps the decision centered on proper setup instead of brand name alone.
What tire series are available for the 2018 BMW Alpina B6 xDrive Gran Coupe?
Several tire series are available for the 2018 BMW Alpina B6 xDrive Gran Coupe, including BFGoodrich g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and Nitto NT555 G2. The exact series depends on the tire size, with the broadest selection appearing in the 245-width front or 19-inch fitments.
Series names help separate the options once the correct size is known, but they do not override fitment. A 245/35R20 front tire and a 275/30R20 rear tire serve different roles on a staggered setup, so compare series only within the correct axle position and wheel diameter. That keeps appearance, handling balance, and wheel compatibility aligned.
Restoration & Appearance
Which tire should I choose for a period-style 2018 BMW Alpina B6 xDrive Gran Coupe?
A period-style choice for a 2018 BMW Alpina B6 xDrive Gran Coupe usually starts with retaining the tire size that matches the car’s actual wheel package. That means 245/40R19 on the 19-inch setup or the staggered 245/35R20 front and 275/30R20 rear combination on the 20-inch setup.
Appearance on this model is more modern and performance-oriented than on older collector cars, so the main visual choice is less about whitewalls or stripes and more about preserving the intended wheel-and-tire proportion. Staying with the proper size and staggered relationship, where applicable, helps the car keep the composed grand-touring look it was meant to carry.
Does correct tire fitment matter for a 2018 BMW Alpina B6 xDrive Gran Coupe restoration?
Correct tire fitment does matter on a 2018 BMW Alpina B6 xDrive Gran Coupe restoration because the visual balance of the car depends heavily on wheel diameter, tire profile, and whether it uses the 19-inch setup or the staggered 20-inch arrangement. Even small changes can alter the overall presentation.
A restoration-minded owner should confirm the wheel package first, then choose tires that preserve the intended sizing relationship at each corner. On a newer collector vehicle like this one, the right fitment also supports the car’s stance and road manners, so checking wheel dimensions and avoiding casual substitutions is just as important as choosing a recognizable brand.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 BMW Alpina B6 xDrive Gran Coupe?
Yes, modifications can affect tire fitment on a 2018 BMW Alpina B6 xDrive Gran Coupe. Aftermarket wheels, changes in wheel width or offset, suspension lowering, and body or brake-related changes can all alter how a 245/40R19, 245/35R20, or 275/30R20 tire sits in the car.
That matters most on the staggered 20-inch setup, where the front and rear tires already differ in width. A modified car should be checked for steering clearance, fender clearance, and proper axle-specific sizing before tire replacement. Looking only at the year and model is not enough once the original wheel or suspension configuration has been changed.
What should I inspect before driving a 2018 BMW Alpina B6 xDrive Gran Coupe on new tires?
Before driving a 2018 BMW Alpina B6 xDrive Gran Coupe on new tires, inspect the wheels for correct diameter and condition, confirm the tires are mounted in the proper front or rear positions, and check inflation pressure. It also helps to look over alignment-related wear points and make sure valve stems and balancing are in order.
A short initial road check is worthwhile after installation. Listen for rubbing, pay attention to steering response, and confirm there is no contact under turning or compression, especially on cars with 20-inch staggered tires. Rechecking pressure and a visual inspection after the first miles can catch small issues before they become larger problems.
What should I check before a longer drive in a 2018 BMW Alpina B6 xDrive Gran Coupe?
Before a longer drive in a 2018 BMW Alpina B6 xDrive Gran Coupe, confirm that all tires match the correct size for the wheel package, inspect tread and sidewalls for cuts, bulges, or cracking, and make sure pressure is set evenly. On a staggered car, verify that the 245/35R20 fronts and 275/30R20 rears are installed in the proper positions.
Longer trips put more emphasis on condition than simple age alone, particularly on enthusiast cars that may not be driven daily. It is smart to check for slow air loss, review wheel condition, and make sure there is no unusual wear pattern that suggests alignment or suspension issues. Catching those details early helps protect both ride quality and tire life.
