The 2018 BMW 740i xDrive sits in the modern 7 Series tradition as a large luxury sedan engineered to blend long-distance comfort with confident all-weather capability. On a car like this, tire choice affects not just appearance, but also the balance between ride quality, steering response, and the wheel package already on the car. This model uses radial tires in several fitments, including 18-, 19-, and 20-inch sizes, with front and rear sizing differences on some setups. Available choices range from blackwall performance-oriented tires to RWL and redline offerings in select sizes. The key is confirming the exact wheel and front-to-rear arrangement before selecting tires for daily use, replacement, or a style-driven update.
Which Tire Size Is Right for The 2018 BMW 740i xDrive
The 2018 BMW 740i xDrive uses five primary tire sizes, and the correct choice depends first on the wheel package and whether the car uses the same size front and rear or a staggered setup. Because this model appears with 18-, 19-, and 20-inch rims, confirming the actual rim diameter and front-to-rear sizing on the car is the first step before comparing brands, sidewall styles, or tire series.
245/45R19 is a metric radial size in which 245 is the section width in millimeters, 45 is the aspect ratio, R identifies radial construction, and 19 is the rim diameter in inches. On the 2018 BMW 740i xDrive, this size is used in a 19-inch fitment and can also appear as a front size in a staggered arrangement. Available choices include BFGoodrich and Nitto blackwall tires across g-Force and NT555 G2 series. This size is the one to evaluate when the car has 19-inch front wheels and a performance-oriented replacement is the goal.
245/50R18 is a metric radial size with a 245-millimeter section width, a 50-series profile, and an 18-inch rim diameter. For the 2018 BMW 740i xDrive, it represents an 18-inch fitment and keeps the same general overall diameter range as the other primary sizes used on this model. Product choices in this size include Pro-Trac Street Pro III options with RWL or redline sidewall styling. This size matters most when the car is equipped with 18-inch wheels and the buyer wants to balance correct fitment with a more distinctive sidewall presentation.
245/40R20 is a metric radial size where 245 gives the section width in millimeters, 40 identifies the aspect ratio, and 20 is the required rim diameter in inches. On the 2018 BMW 740i xDrive, this size is used as a front fitment on 20-inch staggered setups. Choices include blackwall tires from BFGoodrich and Nitto, along with Pro-Trac Street Pro III options in RWL and redline form. This is the size to compare when the car carries 20-inch front wheels and the goal is to match the front axle correctly before selecting the companion rear tire.
275/35R20 is a metric radial size with a 275-millimeter section width, a lower 35-series profile, and a 20-inch rim diameter. On the 2018 BMW 740i xDrive, it serves as the rear size in a 20-inch staggered arrangement, giving the rear axle a wider footprint than the front. Available products include BFGoodrich, Nitto, and Pro-Trac tires, with blackwall, RWL, and redline sidewall treatments depending on the series. This size should be chosen only after confirming that the car uses the matching 20-inch rear wheel setup rather than a square wheel package.
275/40R19 is a metric radial size in which 275 is the section width in millimeters, 40 is the aspect ratio, and 19 is the rim diameter. For the 2018 BMW 740i xDrive, this size is used as the rear fitment on a 19-inch staggered setup, paired with a narrower 19-inch front tire. BFGoodrich and Nitto offer blackwall choices here, including g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2. This is the rear size to verify when the car wears 19-inch staggered wheels and the buyer needs to preserve the front-to-rear sizing relationship.
Sub-model fitment on the 2018 BMW 740i xDrive is tied closely to wheel position and wheel package rather than broad trim differences. Checking whether the car is shown as Base, Base Front, or Base Rear helps separate square 18-inch fitment from 19- and 20-inch staggered front and rear combinations.
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2018 BMW 740i xDrive Base
The 2018 BMW 740i xDrive Base uses same-size radial fitments rather than a front-to-rear stagger in the covered wheel packages. Tire selection here starts with confirming whether the car has the 18-inch or 19-inch setup, then comparing the available brand and sidewall choices within that size.
The 2018 BMW 740i xDrive Base Front identifies the narrower front axle sizes used on staggered radial setups. Tire selection for this position should focus on matching the front wheel diameter correctly and preserving the intended relationship with the wider rear tire.
The 2018 BMW 740i xDrive Base Rear uses the wider rear radial sizes paired with the staggered front fitments. Choosing for this position means confirming whether the car has the 19-inch or 20-inch rear wheel, then selecting a tire that matches the rear setup without mixing incompatible diameters.
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 740i xDrive Tires for Sale
Available 2018 BMW 740i xDrive tire choices span BFGoodrich, Nitto, and Pro-Trac, with differences in tire series, blackwall versus RWL or redline styling, and fitments across 18-, 19-, and 20-inch wheel packages. The product grid is most useful when compared by exact size and wheel position first.
These FAQs focus on the actual tire sizes used on the 2018 BMW 740i xDrive, how front and rear fitment can differ, and what to compare when choosing between available radial tires, wheel packages, and sidewall styles.
Tire Size & Fitment
What tire size fits a 2018 BMW 740i xDrive?
The 2018 BMW 740i xDrive uses 245/50R18, 245/45R19, 245/40R20, 275/40R19, and 275/35R20 radial tire sizes. The 245-width sizes are used in square or front applications, while the 275-width sizes are used at the rear on staggered setups.
The correct choice depends on the actual wheel package on the car. Some 740i xDrive configurations use the same size on all four corners, while others use narrower front tires and wider rear tires, so checking both rim diameter and front-to-rear sizing before replacement is more important than choosing by model name alone.
What size rim does a 2018 BMW 740i xDrive use?
A 2018 BMW 740i xDrive appears with 18-inch, 19-inch, and 20-inch rim diameters. The 245/50R18 size uses an 18-inch rim, 245/45R19 and 275/40R19 use 19-inch rims, and 245/40R20 plus 275/35R20 use 20-inch rims.
Rim diameter is the first fitment detail to confirm because none of these sizes cross over from one wheel diameter to another. A buyer standing at the car should verify the wheel size already installed, then check whether the car has a square setup or a staggered front and rear arrangement before comparing available tires.
Why does the 2018 BMW 740i xDrive have more than one tire size?
The 2018 BMW 740i xDrive has more than one tire size because it appears with different wheel packages and with both square and staggered fitments. The Base setup can use same-size tires, while Base Front and Base Rear identify different front and rear sizes on staggered 19-inch and 20-inch combinations.
That means tire replacement should start with the exact wheel setup on the car, not just the vehicle year and model. A square setup needs the same size at all four corners, while a staggered setup needs the correct front tire matched with the correct rear tire and the proper wheel diameter at each axle.
Choosing the Right Tire
What should I consider when choosing a 2018 BMW 740i xDrive tire?
Start with the exact tire size and wheel position on the car, because the 2018 BMW 740i xDrive can use square or staggered radial fitments in 18-, 19-, or 20-inch diameters. After that, compare construction details such as rim-width compatibility where stated, load figures where available, sidewall style, and the tire series offered in that exact size.
The right choice depends on how the car is used and how it is equipped now. A daily-driven sedan on factory-style wheels may call for a straightforward blackwall replacement, while a style-conscious build may lean toward RWL or redline in the sizes where those treatments are offered.
What sidewall styles are available for 2018 BMW 740i xDrive tires?
Sidewall choices for the 2018 BMW 740i xDrive include blackwall, RWL, and redline, depending on the tire size. Blackwall appears across the BFGoodrich and Nitto offerings, while RWL and redline are available through Pro-Trac Street Pro III in 245/50R18, 245/40R20, and 275/35R20.
That gives the buyer a clear appearance decision in addition to basic fitment. Blackwall keeps a modern, understated look, while RWL and redline add a more visual sidewall treatment, but those style choices should still be filtered by the exact wheel diameter and whether the tire is for the front or rear position.
What brands offer tires for the 2018 BMW 740i xDrive?
Tires for the 2018 BMW 740i xDrive are available from BFGoodrich, Nitto, and Pro-Trac. Depending on the size, the choices include BFGoodrich g-Force series tires, Nitto NT555 G2, and Pro-Trac Street Pro III, with the strongest brand overlap appearing in the 19-inch and 20-inch fitments.
Brand is only one part of the decision. It still makes sense to compare the exact series, sidewall treatment, rim-width specification when shown, and whether the tire is intended for a front or rear staggered position so the replacement matches the way the car is actually set up.
Restoration & Appearance
Which tire should I choose for a period-style 2018 BMW 740i xDrive?
A period-style 2018 BMW 740i xDrive usually starts with keeping the correct wheel diameter and the proper square or staggered sizing arrangement already associated with the car. Once that is established, the buyer can decide between a contemporary blackwall presentation or one of the available RWL or redline options in the sizes where those sidewalls are offered.
Because this is a modern luxury sedan rather than a mid-century collector car, appearance choice tends to be more about preserving the car’s intended stance and wheel package than chasing exact factory-era tire branding. Keeping the correct front and rear relationship will influence the visual result as much as the sidewall style itself.
How does tire construction affect the appearance of a restored 2018 BMW 740i xDrive?
On the 2018 BMW 740i xDrive, construction does not create a bias-ply versus radial appearance decision because the primary fitments are radial throughout. The appearance difference comes more from sidewall treatment, tire series, and whether the car retains its correct 18-, 19-, or 20-inch wheel package and, where applicable, its staggered front and rear sizing.
That makes proportion and presentation especially important. A square setup and a staggered setup can give the same model a different visual balance, and an RWL or redline sidewall changes the look more noticeably than the construction type here, so style choices should always follow confirmed fitment.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 BMW 740i xDrive?
Yes, modifications can affect tire fitment on a 2018 BMW 740i xDrive. Changes such as aftermarket wheels, altered wheel widths, different offsets, lowered suspension, or body modifications can change how a 245-width front tire or 275-width rear tire sits within the available clearance.
That matters even when the size itself matches one of the known fitments. A modified car should be checked for wheel diameter, wheel width, front-to-rear sizing, and clearance at full steering lock and suspension travel so the selected tire suits the actual setup rather than only the original application.
What should I inspect before driving a 2018 BMW 740i xDrive on new tires?
Before driving a 2018 BMW 740i xDrive on new tires, inspect wheel condition, confirm the correct size at each axle, and verify that tire pressure is set appropriately for the installed tires and wheel package. It is also worth checking for any rubbing at the front or rear, especially on cars with staggered sizing or non-stock wheels.
A quick road-use inspection should also include valve stems, tread seating, and any sign of uneven suspension wear that could affect the new tires immediately. On a large luxury sedan, replacing the wrong front or rear size can upset the intended setup, so a final side-to-side and axle-by-axle check is worthwhile.
How often should tires on a 2018 BMW 740i xDrive be inspected?
Tires on a 2018 BMW 740i xDrive should be inspected regularly for pressure loss, tread wear, sidewall damage, and uneven wear patterns. That is especially important on cars using staggered front and rear sizes, because the front and rear tires are not interchangeable in the same way as a square setup.
A brief visual check before routine driving and a closer inspection before longer trips is a sensible habit. Looking for cuts, bulges, cracking, embedded debris, or wear that suggests alignment or suspension issues helps protect both ride quality and tire life, particularly on 19-inch and 20-inch fitments with lower-profile sidewalls.
