The 2015 BMW 640i sits in the grand touring end of BMW’s modern lineup, blending long-hood coupe and convertible styling with the kind of road manners that depend heavily on proper tire fitment. On this car, tire choice is tied closely to wheel package and axle position, with radial sizes spanning 18-, 19-, and 20-inch rims. That means the real decision is not just replacing worn tires, but confirming whether the car uses a square setup or a staggered front-and-rear arrangement. Available choices center on modern blackwall performance radials, so appearance, wheel compatibility, and maintaining the intended stance all matter before selecting a set.
Which Tire Size Is Right for The 2015 BMW 640i
The 2015 BMW 640i uses five primary tire sizes, and the correct choice depends on whether the car is fitted with 18-, 19-, or 20-inch wheels and whether it uses the same size front and rear or a staggered setup. Before choosing a tire, confirm the exact sub-model position and rim diameter, because front and rear fitment can differ even within the same Coupe or Convertible.
Fit(s): Convertible, Convertible Front, Coupe, and Coupe Front
Construction: Radial|Rim: 19 in
245/40R19 is a metric radial size in which 245 identifies the nominal section width in millimeters, 40 is the aspect ratio, R indicates radial construction, and 19 is the rim diameter in inches. On the 2015 BMW 640i, this size is used in a modern touring and performance fitment context and appears on certain standard front or all-around wheel packages. Available choices include BFGoodrich options in the g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A series, all in blackwall form. This size is the one to evaluate when the car carries 19-inch wheels without moving to the wider staggered rear fitment.
245/45R18 is a metric radial size with a 245-millimeter nominal width, a 45-series profile, radial construction, and an 18-inch rim diameter. For the 2015 BMW 640i, it represents an 18-inch fitment used on Coupe and Convertible applications that do not step up to the larger wheel packages. 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 size to confirm when the car still wears its 18-inch wheel setup and a non-staggered arrangement.
245/35R20 is a metric radial size where 245 is the nominal width in millimeters, 35 is the aspect ratio, R marks radial construction, and 20 identifies the wheel diameter. On the 2015 BMW 640i, this size serves as a front fitment in the larger staggered wheel package rather than a universal size for every configuration. BFGoodrich and Nitto both appear in this size, all with blackwall styling, across g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2 series. Choose this size only after confirming a 20-inch front wheel and matching it to the correct rear counterpart.
275/30R20 is a metric radial size with a 275-millimeter nominal section width, a 30-series profile, radial construction, and a 20-inch rim diameter. On the 2015 BMW 640i, it functions as the rear tire in the 20-inch staggered setup, pairing added width with a lower-profile sidewall than the front 245 size. The available product in this fitment is a blackwall Nitto NT555 G2. This is the size to verify when replacing rear tires on a 20-inch package, since using the front size or the 19-inch rear alternative would change the intended wheel-and-axle combination.
275/35R19 is a metric radial size that uses a 275-millimeter nominal width, a 35-series profile, radial construction, and a 19-inch rim diameter. For the 2015 BMW 640i, it serves as the rear tire in the 19-inch staggered arrangement and is not the same role as the 245/40R19 front fitment. Available blackwall options come from BFGoodrich and Nitto, including g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2 lines. This size matters most when the car has wider 19-inch rear wheels and the owner wants to preserve the staggered fitment balance.
Tire fitment on the 2015 BMW 640i varies by both body style and axle position, so identifying the exact Coupe or Convertible setup is important before selecting a tire. Some configurations use the same size at all four corners, while others use a staggered front-and-rear combination on larger wheels.
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2015 BMW 640i Convertible
The 2015 BMW 640i Convertible uses either an 18-inch or 19-inch non-staggered tire fitment, both in radial construction. Tire selection here starts with confirming wheel diameter, then choosing among available blackwall performance and all-season-oriented product lines in the correct size.
The 2015 BMW 640i Convertible Front uses a 245-section radial tire in either 19-inch or 20-inch form, depending on the wheel package. Front tire replacement on this setup requires matching the existing rim diameter and preserving the intended staggered relationship with the rear axle.
The 2015 BMW 640i Convertible Rear uses the wider rear fitment in either 275/35R19 or 275/30R20 radial form. Rear tire selection matters because this axle does not share the same size as the front on staggered setups, so wheel size and tire width both need to stay aligned.
The 2015 BMW 640i Coupe uses either an 18-inch or 19-inch radial tire size in a non-staggered arrangement. The main task is confirming which wheel package is on the car, then comparing available series and brand options within that exact size.
The 2015 BMW 640i Coupe Front uses a 245-section radial front tire in either 19-inch or 20-inch size. This front position should be matched carefully to the rear setup so the car retains the intended staggered wheel-and-tire combination.
The 2015 BMW 640i Coupe Rear uses a wider 275-section radial tire in either 19-inch or 20-inch form. Choosing the correct rear tire means confirming the installed wheel diameter first, then selecting a tire that suits the car’s existing 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 2015 BMW 640i Tires for Sale
Available 2015 BMW 640i tire choices center on blackwall radial performance lines 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 the 18-, 19-, and 20-inch fitments.
BMW 640i tire questions usually come down to size, wheel diameter, and whether the car uses a square or staggered setup. The answers below focus on correct fitment, product selection, and the checks that matter before road use.
Tire Size & Fitment
What tire size fits a 2015 BMW 640i?
The 2015 BMW 640i uses 245/45R18, 245/40R19, 245/35R20, 275/35R19, and 275/30R20 tire sizes, all in radial construction. The 245-section sizes serve either square setups or front positions, while the 275-section sizes are used as rear fitments on staggered combinations.
The correct choice depends on the exact wheel package and whether the car has the same size at all four corners or different front and rear tires. Checking the tire sidewall, wheel diameter, and front-versus-rear fitment before ordering is the safest way to avoid mixing sizes that belong to different setups.
What size rim does a 2015 BMW 640i use?
The 2015 BMW 640i uses 18-inch, 19-inch, and 20-inch rim diameters depending on configuration. The 245/45R18 fits an 18-inch wheel, 245/40R19 and 275/35R19 fit 19-inch wheels, and 245/35R20 with 275/30R20 fit 20-inch wheels.
Rim diameter is the first detail to confirm because the tire sizes are not interchangeable across those wheel diameters. Looking at the wheel itself or reading the existing tire sidewall will usually settle the question quickly, especially on cars that may have changed wheels since new.
Why does the 2015 BMW 640i have more than one tire size?
The 2015 BMW 640i has more than one tire size because it was fitted with different wheel packages, including both square and staggered arrangements. Some Coupe and Convertible applications use the same size front and rear, while others use narrower front tires and wider rear tires.
That variation means tire selection should start with the exact setup on the car rather than the model name alone. A quick check of body style, front and rear size markings, and wheel diameter will tell you whether you need a single size for the whole car or a matched front-and-rear pair.
Choosing the Right Tire
What should I consider when choosing a 2015 BMW 640i tire?
Start with the correct tire size for the wheel package already on the car, because the 2015 BMW 640i spans five radial sizes across 18-, 19-, and 20-inch rims. From there, compare whether the vehicle uses a square setup or a staggered front-and-rear arrangement.
After size is settled, look at tire series, rim-width compatibility where stated, load figures when shown, and whether the tire suits the way the car is used. A touring-oriented street car, a summer-only setup, and a wheel-upgraded car can all lead to different product choices even within the same size.
What brands offer tires for the 2015 BMW 640i?
BFGoodrich and Nitto both offer tires for the 2015 BMW 640i. Depending on the exact size, choices include BFGoodrich g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A options, along with Nitto NT555 G2 fitments in selected sizes.
Brand choice should still come after fitment confirmation, since not every brand appears in every BMW 640i size. Once the wheel diameter and front-or-rear position are confirmed, it becomes easier to compare the available series in that exact size rather than trying to shop the whole vehicle at once.
What tire series are available for the 2015 BMW 640i?
The 2015 BMW 640i is covered by several modern radial series, including BFGoodrich g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and Nitto NT555 G2. Those series appear across the 245-section and 275-section sizes used on the car’s various wheel packages.
Series choice matters because it helps separate the product mix once size is correct. Comparing the series available in your exact fitment can narrow the field by intended use, published specifications, and whether you are replacing a complete set or matching only one axle on a staggered setup.
Restoration & Appearance
Which tire should I choose for a period-style 2015 BMW 640i?
A period-style 2015 BMW 640i tire choice usually starts with preserving the car’s original wheel diameter and overall square or staggered layout. Since the available fitments here are all modern blackwall radials, the look stays consistent with the understated appearance expected on a contemporary grand touring BMW.
Keeping the correct 18-, 19-, or 20-inch size combination will do more for the car’s visual balance than chasing a different tread line at random. Owners focused on originality should also verify the actual wheels on the car, because replacement wheels can change the stance and alter what looks appropriate.
Does correct tire fitment matter for a 2015 BMW 640i restoration?
Correct tire fitment matters because the 2015 BMW 640i relies on specific wheel diameters and, in some versions, a staggered front-and-rear layout. Using the wrong section width or rim diameter can change the car’s proportions and move it away from the appearance intended by its factory wheel package.
Restoration-minded buyers should verify whether the car retains its original wheel setup before selecting tires. Matching the tire size to the proper axle position is especially important on 19-inch and 20-inch staggered combinations, where front and rear tires are meant to work as a visual and functional pair.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 BMW 640i?
Yes, modifications can affect tire fitment on a 2015 BMW 640i, especially if the car has aftermarket wheels, suspension changes, or altered ride height. Those changes can influence which of the 18-inch, 19-inch, or 20-inch tire sizes still make sense for the wheel and the available clearance.
Even when the tire size matches the sidewall markings already on the car, it is worth checking wheel width, front steering clearance, and rear fender room before replacing tires. On staggered setups, a change at one axle can create problems that are not obvious until the car is driven or fully loaded.
What should I inspect before driving a 2015 BMW 640i on new tires?
Before driving a 2015 BMW 640i on new tires, inspect the wheel condition, confirm the tire size at each axle, and make sure the tires are mounted on the correct rim diameter. It also helps to check for visible issues such as bent wheels, leaking valves, or signs of uneven wear from the previous set.
A short clearance check is especially worthwhile on cars with 19-inch or 20-inch staggered fitments. Turning the front wheels lock to lock and looking at rear inner and outer clearance can catch setup problems early, while proper inflation and a fresh alignment help the new tires wear as intended.
What should I check before a longer drive in a 2015 BMW 640i?
Before a longer drive, confirm that the 2015 BMW 640i has matching tire sizes on the correct axle positions and that all four tires are properly inflated. The tread and sidewalls should be inspected for cuts, bulges, cracking, punctures, or any unusual wear pattern that suggests a fitment or alignment issue.
Longer trips also make it important to verify that the wheel and tire setup is consistent across the car, especially on staggered 19-inch or 20-inch combinations. A final check of lug torque, air retention, and any vibration during the first few miles can prevent a small issue from becoming a roadside problem.
