The 2014 BMW 640i xDrive blends grand-touring comfort with the long, low proportions that define the modern 6 Series, and its all-wheel-drive layout adds another layer of fitment detail for tire selection. On this car, tire choice is tied closely to wheel package and, in staggered applications, to front-versus-rear sizing. Primary fitments include 18-, 19-, and 20-inch metric radial sizes such as 245/45R18, 245/40R19, 245/35R20, 275/35R19, and 275/30R20. Available choices center on blackwall radial performance tires from BFGoodrich and Nitto across several series. The key is confirming the exact wheel diameter and whether the car uses a square or staggered setup before selecting replacements.
Which Tire Size Is Right for The 2014 BMW 640i xDrive
The 2014 BMW 640i xDrive uses five primary tire sizes, and the right one depends on wheel diameter, axle position, and whether the car is equipped with a square or staggered setup. All of these fitments are metric radial sizes, but 18-, 19-, and 20-inch wheels are all in the mix. Confirming the exact sub-model and checking whether you are replacing front tires, rear tires, or all four is the first step before comparing tire options.
Fit(s): Convertible, Convertible Front, Coupe, and Coupe Front
Construction: Radial|Rim: 19 in
245/40R19 is a metric radial size in which 245 is the nominal section width in millimeters, 40 is the aspect ratio, and 19 is the rim diameter in inches. On the 2014 BMW 640i xDrive, this size serves as a primary fitment on 19-inch wheel applications and appears in both coupe and convertible coverage. Available options come in blackwall radial form from BFGoodrich across the g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A series. It is the size to evaluate when the car retains its 19-inch front or square-wheel configuration.
245/45R18 follows the same metric radial format, with a 245-millimeter nominal width, a 45-series profile, and an 18-inch rim diameter. This size is used on 18-inch wheel applications for the 2014 BMW 640i xDrive and is associated with the non-staggered coupe and convertible fitment. Product choices include blackwall radials from BFGoodrich and Nitto, with several series available for buyers comparing different performance-oriented options. It is the correct place to start when the car still wears 18-inch wheels and all four tires match front to rear.
245/35R20 is a metric radial size with a 245-millimeter nominal width, a lower 35-series profile, and a 20-inch rim diameter. On the 2014 BMW 640i xDrive, it is used as a front fitment in the staggered 20-inch setup rather than as a universal size for every position on the car. Blackwall radial choices are available from BFGoodrich and Nitto, including multiple g-Force series and the NT555 G2. This size matters when replacing front tires on a 20-inch package, where matching the rear setup and preserving proper front-to-rear balance is essential.
275/30R20 is a wider metric radial size, with 275 indicating nominal section width in millimeters, 30 indicating the aspect ratio, and 20 indicating rim diameter. On the 2014 BMW 640i xDrive, this is a rear tire size for the staggered 20-inch arrangement, paired with a narrower front tire rather than used at all four corners. The available product choice is a blackwall Nitto NT555 G2 radial. It should be selected only after confirming that the car has the 20-inch rear wheel package and that the rear axle requires the wider staggered fitment.
275/35R19 is a metric radial size that combines a 275-millimeter nominal width with a 35-series profile on a 19-inch rim. For the 2014 BMW 640i xDrive, this size is used at the rear in the staggered 19-inch setup, where it works with a narrower front tire on the same wheel diameter. Buyers can compare blackwall radial options from BFGoodrich and Nitto, including g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2. It is the correct rear size to review when the car uses the 19-inch staggered package instead of a square setup.
Sub-model fitment on the 2014 BMW 640i xDrive is not one-size-fits-all, because wheel diameter and front-versus-rear sizing change across the covered configurations. Checking whether the car is a coupe or convertible and whether you are matching a front, rear, or square setup keeps the tire search on the correct path.
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2014 BMW 640i xDrive Convertible
The 2014 BMW 640i xDrive Convertible uses either an 18-inch or 19-inch square fitment, with the same tire size at all four corners depending on wheel package. Tire selection starts with confirming wheel diameter, then comparing blackwall radial options in the correct size.
The 2014 BMW 640i xDrive Convertible Front fitment covers the front axle in staggered setups, where tire size changes with either 19-inch or 20-inch wheels. That makes front-tire replacement a wheel-package decision rather than a generic 640i xDrive choice.
The 2014 BMW 640i xDrive Convertible Rear fitment uses wider rear tires in staggered applications, with different sizes tied to 19-inch and 20-inch wheel packages. Rear-tire selection should stay aligned with the matching front setup so overall fitment remains consistent.
The 2014 BMW 640i xDrive Coupe also uses either an 18-inch or 19-inch square fitment depending on the wheel setup on the car. Once wheel diameter is confirmed, the decision shifts to comparing radial series and brand options within the correct metric size.
The 2014 BMW 640i xDrive Coupe Front fitment applies to staggered front-axle setups and changes between 19-inch and 20-inch wheels. Front tire replacement should match the existing wheel package and preserve the intended staggered relationship with the rear tires.
The 2014 BMW 640i xDrive Coupe Rear fitment uses wider rear tire sizing in staggered applications, again split between 19-inch and 20-inch wheel packages. Choosing the correct rear tire means confirming both wheel diameter and whether the car is using the staggered configuration.
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 2014 BMW 640i xDrive Tires for Sale
Available 2014 BMW 640i xDrive tire choices center on blackwall radial performance tires 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 options across 18-, 19-, and 20-inch fitments.
The most common 2014 BMW 640i xDrive tire questions center on wheel-package fitment, staggered front and rear sizing, radial tire selection, and what to inspect before putting a grand-touring BMW back into regular road use.
Tire Size & Fitment
What tire size fits a 2014 BMW 640i xDrive?
The 2014 BMW 640i xDrive uses several primary tire sizes: 245/45R18, 245/40R19, 245/35R20, 275/35R19, and 275/30R20. All of them are radial metric sizes, but they do not serve the same role. Some are square fitments used at all four corners, while others belong to staggered setups where the front and rear tires are different widths and profiles.
The practical step is to identify the wheel diameter on the car first, then confirm whether it uses the same size front and rear or a staggered arrangement. Replacing tires by size alone can cause problems if the car has a different wheel package than expected. Looking at the existing tire sidewall and wheel diameter before ordering helps keep the match correct.
What size rim does a 2014 BMW 640i xDrive use?
The 2014 BMW 640i xDrive uses 18-inch, 19-inch, and 20-inch rim diameters depending on the tire size and wheel package. The 245/45R18 size fits an 18-inch rim, 245/40R19 and 275/35R19 fit 19-inch rims, and 245/35R20 plus 275/30R20 fit 20-inch rims. Rim diameter is built directly into the tire size code, so it has to match exactly.
Wheel diameter is the first fitment detail to verify because a 19-inch tire cannot be mounted on an 18-inch or 20-inch wheel. After that, check whether the car has a square setup or wider rear tires. If the BMW has aftermarket wheels, confirm both diameter and wheel width before narrowing the tire choices.
Why does the 2014 BMW 640i xDrive have more than one tire size?
More than one tire size appears on the 2014 BMW 640i xDrive because the car was fitted with different wheel diameters and with both square and staggered tire arrangements. Square applications use the same size at all four corners, while staggered applications use narrower front tires and wider rear tires. That is why both 245-width and 275-width sizes appear in the fitment range.
The extra sizes do not mean every 2014 BMW 640i xDrive can use all five tires interchangeably. The correct choice depends on the exact setup on the car today. A quick check of the existing tire sidewalls, wheel diameter, and front-versus-rear sizing pattern is the best way to avoid mixing square and staggered fitments by mistake.
Choosing the Right Tire
What should I consider when choosing a tire for a 2014 BMW 640i xDrive?
Start with the exact tire size, wheel diameter, and whether the car uses a square or staggered setup. The 2014 BMW 640i xDrive spans 18-inch, 19-inch, and 20-inch fitments, and some applications use wider rear tires than front tires. All of the primary options here are radial blackwall tires, so the main selection factors become size accuracy, wheel compatibility, and the character of the tire series.
Once fitment is confirmed, compare brands, tread category, and any meaningful specification differences such as rim-width range, weight, or load capacity where those details are available. A car driven mainly for touring may call for a different product emphasis than one used more aggressively. Matching the tire to the car's actual wheel package remains more important than choosing by brand name alone.
What brands offer tires for the 2014 BMW 640i xDrive?
Tires for the 2014 BMW 640i xDrive are available from BFGoodrich and Nitto in the covered sizes. BFGoodrich appears across several 18-inch, 19-inch, and 20-inch fitments with multiple g-Force series, while Nitto appears in selected sizes through the NT555 G2 line. Both brands are offered in blackwall radial form for this vehicle's fitment range.
Brand choice makes more sense after the exact size has been nailed down, because not every brand appears in every fitment. A rear 275/30R20 replacement, for example, does not offer the same product spread as a more common front or square size. The best comparison is within the correct size first, then across the available brand and series options.
What tire series are available for the 2014 BMW 640i xDrive?
The 2014 BMW 640i xDrive is covered by several tire series, including BFGoodrich g-Force Sport Comp 2, BFGoodrich g-Force Comp 2 AS, BFGoodrich g-Force Phenom T/A, and Nitto NT555 G2. Availability depends on the exact size, so some wheel packages give a broader comparison set than others. All of these options are radial blackwall tires rather than period-style collector fitments.
Series choice matters because it lets you compare the character of the available tire lineup within the proper size. A square 245 fitment may offer more than one BFGoodrich series plus a Nitto alternative, while a wider staggered rear size may be more limited. Once the fitment is verified, the series comparison becomes the practical way to narrow the choices.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2014 BMW 640i xDrive?
Yes. Wheel changes, altered offsets, suspension modifications, or a switch from square to staggered sizing can all affect tire fitment on a 2014 BMW 640i xDrive. Even when the tire size looks close to a standard fitment, the actual wheel and body setup on the car can change how much room is available at the strut, inner fender, and outer body line.
That matters most on low-profile 19-inch and 20-inch combinations, where there is less visual margin for error. A smart check includes wheel diameter, wheel width, and the tire size currently mounted at each axle. Any BMW that has been lowered or fitted with aftermarket wheels deserves a clearance inspection before changing tire sizes or mixing front and rear fitments.
What should I inspect before driving a 2014 BMW 640i xDrive on new tires?
Before putting a 2014 BMW 640i xDrive back into regular use on new tires, inspect wheel condition, confirm the new tire sizes match the car's actual setup, and make sure inflation is set correctly for the installed tires. It also helps to look over suspension and steering components so the new tires are not being asked to run on a worn or unstable platform.
After installation, check for even clearance at full steering lock and over bumps, especially on staggered 19-inch or 20-inch setups. A short initial drive should include a follow-up inspection for rubbing, unusual vibration, or air loss. Catching those issues early is particularly important on a grand-touring car that may spend long stretches at highway speed.
How often should tires on a 2014 BMW 640i xDrive be inspected?
Tires on a 2014 BMW 640i xDrive should be inspected regularly, not just when tread looks low. A visual check for uneven wear, cuts, bulges, punctures, or sidewall damage is worthwhile before longer drives and at routine service intervals. Pressure should also be monitored consistently, since low-profile radial tires can react noticeably to pressure loss and alignment issues.
Cars that are driven less often still need attention because age, storage conditions, and long parked periods can affect tire condition. Looking at the tires during washes, fuel stops, or garage moves makes problems easier to catch early. Any sign of vibration, pull, repeated pressure loss, or shoulder wear deserves a closer inspection before more road miles are added.
