The 2018 BMW Alpina B7 blends full-size executive luxury with the discreet, high-speed character that has long defined Alpina’s approach to BMW performance sedans. It is a sophisticated, powerful car, and its tire fitment reflects that with staggered radial sizing rather than a one-size-fits-all setup. Depending on whether the car has the standard 20-inch arrangement or the 21-inch option, front and rear tire sizes differ to match the vehicle’s wheel package. That makes wheel diameter and axle position the first things to confirm before comparing available tires, especially if appearance, road manners, or previous wheel changes are part of the decision.
Which Tire Size Is Right for The 2018 BMW Alpina B7
The 2018 BMW Alpina B7 uses four primary tire sizes across two staggered wheel packages, all in radial construction. The first step is confirming whether the car has the standard 20-inch setup or the 21-inch option, then matching the correct front and rear sizes to that wheel diameter before comparing tire choices.
A 255/35R21 tire uses a 255-millimeter section width, a 35-series aspect ratio, radial construction, and a 21-inch rim. On the 2018 BMW Alpina B7, this size serves the front position on the 21-inch wheel package, so it is part of a staggered fitment rather than a universal all-around size. Its low-profile metric radial format suits the car’s modern performance-luxury character and should be matched carefully to the correct axle and wheel diameter. Anyone replacing this size should confirm the car still has its 21-inch front wheels and has not been converted to the 20-inch setup.
A 295/30R21 tire combines a 295-millimeter section width with a 30-series profile, radial construction, and a 21-inch rim. This is the rear tire size for the 2018 BMW Alpina B7 with the 21-inch option, giving that package its wider staggered rear fitment. The size is notably different from the front tire, so it should be treated as a rear-specific application rather than a general replacement choice. Before selecting a tire in this size, verify rear wheel diameter and make sure any prior wheel or suspension changes have not altered the original 21-inch package.
A 255/40R20 tire denotes a 255-millimeter section width, a 40-series aspect ratio, radial construction, and fitment on a 20-inch rim. On the 2018 BMW Alpina B7, this is the front tire size for the standard 20-inch staggered setup. Available product choice in this size includes BFGoodrich in the g-Force Phenom T/A series with a Blackwall sidewall, giving buyers a clear example of the modern performance-oriented options in this fitment. This size should be evaluated as a front-position tire, with wheel width and overall vehicle setup checked before replacement.
A 295/35R20 tire uses a 295-millimeter section width, a 35-series profile, radial construction, and a 20-inch rim. It serves the rear position on the 2018 BMW Alpina B7’s 20-inch staggered setup, where the wider rear tire complements the narrower front size. Product availability in this fitment includes a Nitto NT555 G2 with a Blackwall sidewall, reflecting the performance-focused character expected in a modern rear application. Choosing this size starts with confirming that the car retains its 20-inch rear wheels and that the replacement is being matched to the rear axle rather than the front.
Sub-model fitment on the 2018 BMW Alpina B7 is defined by wheel package and axle position rather than by a single all-around tire size. Checking whether the car has the standard 20-inch setup or the 21-inch option matters first, then the correct front and rear sizes need to be matched to that package.
1
2018 BMW Alpina B7 xDrive (21 Inch Option) Front
The 21-inch option front position uses a dedicated radial tire size that belongs only to that wheel package and axle location. Tire selection here starts with confirming the car still carries its 21-inch front wheels and matching the replacement to the front of the staggered setup.
The 21-inch option rear position uses its own wider radial size, separate from the front and specific to the staggered arrangement. That makes rear-wheel diameter and axle position essential checks before comparing replacements or evaluating any car that may have had wheel changes.
The standard xDrive front position uses the 20-inch front tire fitment, which is different from both the rear and the optional 21-inch package. Buyers should focus on matching the front axle correctly and reviewing wheel width and tire specs when comparing available 20-inch choices.
The standard xDrive rear position uses a wider 20-inch rear tire that completes the factory-style staggered arrangement. Tire selection should stay centered on the rear axle application and on confirming that the car has not been converted to a different wheel package.
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 B7 Tires for Sale
Available product choices for the 2018 BMW Alpina B7 currently center on the 20-inch fitments, with BFGoodrich and Nitto options in Blackwall performance-oriented tire series. The main points to compare are front versus rear size, brand, tire series, rim-width compatibility where stated, and load-related specifications.
These FAQs focus on the 2018 BMW Alpina B7’s staggered tire sizing, 20-inch versus 21-inch wheel packages, available product choices, and the fitment checks that matter before road use or replacement.
Tire Size & Fitment
What tire size fits a 2018 BMW Alpina B7?
The 2018 BMW Alpina B7 uses staggered radial tire sizes rather than one universal fitment. The standard 20-inch setup uses 255/40R20 in front and 295/35R20 in the rear, while the 21-inch option uses 255/35R21 in front and 295/30R21 in the rear.
The key is matching both wheel diameter and axle position. A front tire size should not automatically be treated as a rear replacement, and a 20-inch setup should not be mixed casually with the 21-inch package. Checking the wheel currently on the car is especially important if it has had aftermarket wheel changes or previous tire substitutions.
What size rim does a 2018 BMW Alpina B7 use?
A 2018 BMW Alpina B7 uses either 20-inch or 21-inch rims, depending on the wheel package installed on the car. The standard staggered setup is built around 20-inch wheels, while the optional staggered setup uses 21-inch wheels front and rear.
Rim diameter is the first fitment check because each tire size is built for one specific wheel diameter. Even when the overall tire dimensions are close between the 20-inch and 21-inch packages, the tire must still match the wheel itself. Owners should also confirm wheel width and inspect whether the car still carries its original-style staggered arrangement.
Why does the 2018 BMW Alpina B7 have more than one tire size?
The 2018 BMW Alpina B7 has more than one tire size because it uses staggered fitment, with different front and rear sizes, and it was also offered with two wheel diameters. That creates one front and one rear size for the 20-inch package, and another front and rear size for the 21-inch option.
This means the first question is not simply which tire fits the car, but which wheel package and axle position apply to it. Tire replacement gets much easier once that is confirmed. Looking at the existing tire sidewall and wheel diameter is the quickest way to avoid ordering a front tire for the rear or a 20-inch tire for a 21-inch wheel.
Choosing the Right Tire
What should I consider when choosing a tire for a 2018 BMW Alpina B7?
Start with the exact size required for the car’s wheel package and axle position, since the 2018 BMW Alpina B7 uses a staggered setup in either 20-inch or 21-inch form. Construction is straightforward because the primary fitments are radial, so the main decision is matching the correct size to the correct wheel.
After that, compare brand, tire series, sidewall style, and any stated rim-width or load-related specifications. A front tire and rear tire may have different priorities even on the same car because the sizes differ. It also helps to verify whether the car remains stock, since wheel changes or suspension alterations can change what needs to be checked before replacement.
What sidewall styles are available for 2018 BMW Alpina B7 tires?
Current product coverage for the 2018 BMW Alpina B7 includes Blackwall sidewall styling on the available 20-inch fitments. That keeps the appearance in line with the modern, understated look typically associated with a high-performance luxury sedan rather than a vintage-style sidewall presentation.
Sidewall style is mostly an appearance decision once the correct size and wheel fitment are confirmed. Since the available products shown for this application are Blackwall, the bigger comparison points become tire series, brand, and the exact front or rear fitment involved. Owners trying to preserve a consistent look should match sidewall treatment across the axle pair.
What brands offer tires for the 2018 BMW Alpina B7?
Available tire choices for the 2018 BMW Alpina B7 include BFGoodrich and Nitto in the covered 20-inch sizes. BFGoodrich appears in the 255/40R20 front fitment through the g-Force Phenom T/A series, while Nitto appears in the 295/35R20 rear fitment through the NT555 G2 series.
Brand choice should still come after the fitment basics are settled, because a strong brand name does not override the need for the correct axle position and wheel diameter. It is also worth comparing the series itself, since that often tells more about the tire’s character than the brand alone. Matching the intended front and rear setup remains the priority.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 BMW Alpina B7?
Yes. Modifications can affect tire fitment on a 2018 BMW Alpina B7, especially because the car already uses a staggered setup and may be equipped with either 20-inch or 21-inch wheels. Aftermarket wheels, altered offsets, suspension changes, or ride-height adjustments can all change clearance and replacement-tire requirements.
That is why the existing wheel and tire combination should be checked before selecting replacements. A car that appears to be using one of the original size combinations may still have wheel-width or offset differences that matter in practice. Looking at the wheel diameter, the current tire size, and visible clearance at the fender and suspension is a sensible starting point.
What should I inspect before driving a 2018 BMW Alpina B7 on new tires?
Before driving a 2018 BMW Alpina B7 on new tires, confirm that the correct front and rear sizes were installed for the car’s 20-inch or 21-inch package. Then inspect inflation pressure, bead seating, valve condition, visible sidewall damage, and clearance around the suspension and fender openings.
It also helps to check that the staggered arrangement has been preserved correctly, since a front-size and rear-size mix-up can create immediate problems. A short, careful road test is useful for catching vibration, rubbing, or unusual steering feel early. Rechecking pressure after initial use is a good habit, particularly on a performance-oriented luxury sedan with low-profile tires.
How often should tires on a 2018 BMW Alpina B7 be inspected?
Tires on a 2018 BMW Alpina B7 should be inspected regularly, not just when tread looks worn. On a low-profile staggered setup, routine visual checks for cuts, cracking, punctures, bulges, and uneven wear are important, along with periodic pressure checks and a quick look at the inner and outer shoulders.
A practical routine is to inspect them before longer drives and anytime the car has been parked for an extended period. Luxury performance cars can cover low annual mileage yet still age their tires over time, so condition matters as much as tread depth. Paying attention to any air loss, vibration, or contact marks can prevent small issues from becoming larger fitment problems.
