The 2017 BMW 640i sits in the grand touring side of the 6 Series lineup, blending long-hood BMW coupe and convertible styling with modern highway comfort and strong road manners. Tire selection on this car is driven less by vintage-style restoration concerns and more by confirming the exact wheel and axle setup, because the 640i uses several radial sizes across 18-, 19-, and 20-inch fitments. Front and rear staggered combinations are part of that picture on some configurations. Available choices center on blackwall performance-oriented radial tires from BFGoodrich and Nitto, so the real task is matching the correct size to the car's wheels and intended use.
Which Tire Size Is Right for The 2017 BMW 640i
The 2017 BMW 640i uses five primary tire sizes, and the right one depends on both the specific sub-model and the wheel diameter already on the car. Some configurations use square fitments, while others use staggered front and rear sizes, so the first step is confirming whether the car has 18-, 19-, or 20-inch wheels and whether the front and rear sizes differ.
Fit(s): Convertible, Convertible Front, Coupe, and Coupe Front
Construction: Radial|Rim: 19 in
245/40R19 is a metric radial size with a 245-millimeter section width, a 40-series profile, radial construction, and a 19-inch rim diameter. On the 2017 BMW 640i, this size appears in 19-inch fitments and can also serve as a front size in staggered setups. Product choices in this size include BFGoodrich options from the g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A lines, all in blackwall form. This size is the right place to start when the car already wears 19-inch wheels and does not call for a wider rear tire.
245/45R18 is a metric radial that combines a 245-millimeter section width with a 45-series profile on an 18-inch wheel. For the 2017 BMW 640i, it is used on 18-inch square fitments rather than the staggered front and rear combinations seen with some larger wheel packages. Available blackwall tires come from BFGoodrich and Nitto, with several g-Force series choices alongside the Nitto NT555 G2. This size is worth focusing on when preserving the car's 18-inch wheel setup matters more than moving to a larger-diameter appearance package.
245/35R20 is a low-profile metric radial with a 245-millimeter section width, a 35-series aspect ratio, and a 20-inch rim diameter. On the 2017 BMW 640i, this size is used as a front fitment in staggered 20-inch combinations rather than as a universal size for every wheel position. BFGoodrich and Nitto both offer blackwall choices here, including g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2 lines. It becomes the correct target when the car has 20-inch front wheels and is paired with a wider rear tire.
275/30R20 is a wider metric radial using a 275-millimeter section width, a 30-series profile, and a 20-inch rim. On the 2017 BMW 640i, this size belongs to the rear of a staggered 20-inch setup, where it complements a narrower 245/35R20 front tire. The available product in this size is a blackwall Nitto NT555 G2, giving the rear axle a focused performance-oriented option. This is the size to verify when the car uses the 20-inch staggered arrangement, since rear width, wheel size, and axle position all matter here.
275/35R19 is a metric radial with a 275-millimeter section width, a 35-series profile, and a 19-inch wheel diameter. For the 2017 BMW 640i, it serves as the rear tire in staggered 19-inch combinations, pairing with a narrower 245/40R19 at the front. Buyers can compare blackwall choices from BFGoodrich and Nitto, including multiple g-Force series and the NT555 G2, with some variation in rim-width compatibility across products. This size deserves careful attention on cars with staggered 19-inch wheels, because the rear fitment is not interchangeable with the front.
Tire fitment on the 2017 BMW 640i varies by sub-model and by wheel position, so checking the exact configuration matters before choosing a tire. Coupe and Convertible models can use square 18- or 19-inch setups, while Front and Rear entries reflect staggered combinations that split the tire sizes by axle.
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2017 BMW 640i Convertible
The 2017 BMW 640i Convertible uses square-fitment radial tire sizes, with either an 18-inch or 19-inch setup depending on the wheels on the car. That makes wheel diameter the main checkpoint before comparing blackwall tire choices and series within the correct size.
The 2017 BMW 640i Convertible Front entry covers the front axle in staggered fitments, using either a 19-inch or 20-inch front radial size. Tire selection here should stay focused on the actual front wheel diameter so the front tire matches the rear setup already on the car.
The 2017 BMW 640i Convertible Rear entry uses wider rear radial sizes for staggered fitments, with separate 19-inch and 20-inch rear options. Choosing correctly here means confirming the rear wheel diameter and keeping the rear tire matched to the front axle's companion size.
The 2017 BMW 640i Coupe uses square radial fitments in either 18-inch or 19-inch sizes, depending on wheel package. The key decision is confirming the wheel diameter first, then comparing the available blackwall tires, brands, and series within that correct size.
The 2017 BMW 640i Coupe Front entry applies to staggered front-axle fitments, where the car uses a narrower front tire in either 19-inch or 20-inch form. Tire choice should be tied to the actual front wheel size and coordinated with the rear axle's wider staggered tire.
The 2017 BMW 640i Coupe Rear entry covers the wider rear tire in staggered 19-inch or 20-inch combinations. That makes rear wheel diameter the first thing to verify, followed by product selection that preserves the intended front-to-rear stagger.
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 2017 BMW 640i Tires for Sale
Available 2017 BMW 640i tires center on blackwall radial performance options from BFGoodrich and Nitto. Depending on size, buyers can compare g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2 choices across the 18-, 19-, and 20-inch fitments used on this model.
Common 2017 BMW 640i tire questions usually come down to identifying the correct size for the wheel setup, understanding staggered front and rear fitments, and comparing the available radial tire options for road use and overall presentation.
Tire Size & Fitment
What tire size fits a 2017 BMW 640i?
The 2017 BMW 640i uses several radial tire sizes: 245/45R18, 245/40R19, 245/35R20, 275/35R19, and 275/30R20. Square setups use the same size at all four corners, while staggered setups split the fitment between a narrower front tire and a wider rear tire.
The correct choice depends on the exact wheel package and whether the car has matching front and rear wheel widths or a staggered arrangement. Checking the tire size already on the car, the wheel diameter, and whether the front and rear sizes differ will keep the next comparison focused on the right fitment.
What size rim does a 2017 BMW 640i use?
The 2017 BMW 640i uses 18-inch, 19-inch, and 20-inch rim diameters depending on configuration. The 245/45R18 size fits 18-inch wheels, 245/40R19 and 275/35R19 fit 19-inch wheels, and 245/35R20 with 275/30R20 belong to 20-inch staggered combinations.
Rim diameter is the first fitment point to confirm because a 19-inch tire cannot be mounted on an 18-inch or 20-inch wheel. Once wheel diameter is verified, the next step is making sure the front and rear axle sizes match the car's actual setup rather than assuming every 640i uses the same arrangement.
Why does the 2017 BMW 640i have more than one tire size?
The 2017 BMW 640i has more than one tire size because it was fitted with different wheel diameters and also uses staggered front and rear combinations in some configurations. That creates separate fitment paths for square 18- or 19-inch setups and for staggered 19- or 20-inch axle-specific arrangements.
That means tire selection starts with the car as it sits now, not with the model name alone. Looking at the wheel diameter, checking whether the rear tires are wider than the fronts, and confirming the exact axle position will prevent mixing front and rear sizes that were intended for different wheel packages.
Choosing the Right Tire
What should I consider when choosing a tire for a 2017 BMW 640i?
Start with the correct size, wheel diameter, and whether the 2017 BMW 640i has a square or staggered setup. All of the primary fitments here are radial, so the main comparisons are brand, tire series, rim-width compatibility where stated, and whether the tire belongs on the front or rear axle.
A 640i used mainly for general street driving may lead toward an all-season style choice, while a more performance-focused setup may point toward a sport-oriented series in the same size. Keeping the decision anchored to the actual wheel package will matter more than choosing a tire by brand name alone.
What brands offer tires for the 2017 BMW 640i?
BFGoodrich and Nitto both offer tires in the sizes used on the 2017 BMW 640i. BFGoodrich appears across several of the 18-, 19-, and 20-inch fitments with multiple g-Force series, while Nitto is available in select sizes through the NT555 G2 line.
Brand choice should come after the correct size and axle position are settled. Once that is established, the useful comparison becomes which brand offers the right combination of series, blackwall presentation, and wheel-width compatibility for the specific front, rear, or square fitment already on the car.
What tire series are available for the 2017 BMW 640i?
The 2017 BMW 640i tire selection includes BFGoodrich g-Force Sport Comp 2, BFGoodrich g-Force Comp 2 AS, BFGoodrich g-Force Phenom T/A, and Nitto NT555 G2 series, depending on size. These series span several of the 18-, 19-, and 20-inch radial fitments used on the car.
Series choice matters because it helps separate the available tires by product character within the same basic size. After confirming the correct wheel diameter and whether the car uses a front or rear staggered size, comparing the series in that exact fitment will make the product grid much easier to sort through.
Restoration & Appearance
Which tire should I choose for a period-style 2017 BMW 640i?
A period-style approach on a 2017 BMW 640i usually means staying with the correct original-type wheel diameter and the proper square or staggered sizing pattern rather than trying to recreate a vintage look. The available tires are modern blackwall radials, which suit the car's contemporary grand touring character.
Appearance on a newer collector BMW is shaped more by keeping the proportions right than by choosing wide whitewalls or other classic-era sidewall treatments. Matching the car's actual 18-, 19-, or 20-inch setup and preserving the intended front-to-rear relationship will keep the visual stance closer to the way the car was meant to sit.
Does correct tire fitment matter for a 2017 BMW 640i restoration?
Correct tire fitment matters on a 2017 BMW 640i because the car can use square or staggered radial setups across three different rim diameters. The wrong tire size can upset the appearance of the wheel package just as easily as it can complicate basic mounting and clearance.
For a restoration-minded owner, the important step is confirming how the car was equipped before ordering tires. Preserving the correct wheel diameter and front-to-rear sizing relationship will usually do more for the finished look than chasing an arbitrary size that happens to mount on the same basic rim.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2017 BMW 640i?
Yes, modifications can affect tire fitment on a 2017 BMW 640i. Aftermarket wheels, altered offsets, suspension changes, or changes from a square setup to a staggered one can all change how a 245- or 275-section tire sits within the wheel opening and how much clearance it has while turning or compressing.
Even when the tire size matches one used on a 640i, the wheel itself may not place the tire in the same position as an original-style setup. Checking wheel diameter, width, axle position, and available clearance before mounting new tires is the safest way to avoid avoidable fitment surprises.
What should I inspect before driving a 2017 BMW 640i on new tires?
Before driving a 2017 BMW 640i on new tires, inspect the wheels for damage, confirm that the front and rear sizes are mounted in the correct positions, and make sure inflation is set appropriately for the installed tires. A quick look for valve condition, proper bead seating, and any obvious rubbing is also worthwhile.
A short first drive should be used to check for vibration, steering pull, or contact under turning and suspension movement. On a car with staggered tires, it is especially important to confirm that the wider rear sizes stayed at the rear and that each axle received the intended size for that wheel diameter.
What should I check before a longer drive in a 2017 BMW 640i?
Before a longer drive in a 2017 BMW 640i, confirm tire pressures, inspect the tread and sidewalls for cuts or bulges, and make sure the tire sizes on the car match the actual wheel setup. On a staggered car, the front and rear sizes should still correspond to the proper axle positions.
Longer road use also makes it worth checking for slow air loss and any signs of uneven wear that could point to alignment or suspension issues. A 640i that has sat for extended periods should get an extra close look, since low-use cars can develop tire condition problems even when tread depth still looks acceptable.
