The 2020 BMW M240i sits in the modern compact performance coupe class, blending BMW’s rear-drive character with everyday usability in both Coupe and Convertible form. It is a car that rewards precise steering, balanced handling, and a tire setup that matches its staggered stance. This application uses radial tires in two sizes, with 225/40R18 at the front and 245/35R18 at the rear on 18-inch wheels. Available choices center on blackwall performance-oriented tires from BFGoodrich and Nitto across several series. For an M240i owner, the key is confirming front-versus-rear fitment and matching the tire choice to the car’s current wheel setup and intended road use.
Which Tire Size Is Right for The 2020 BMW M240i
The 2020 BMW M240i uses two primary tire sizes, both in radial construction on 18-inch rims. The main decision is confirming whether you are replacing the front or rear tires, since the car uses a staggered setup with a narrower front size and a wider rear size across the covered Coupe and Convertible configurations.
Fit(s): Convertible, Convertible Front, Coupe, and Coupe Front
Construction: Radial|Rim: 18 in
225/40R18 is a metric radial size with a 225-millimeter nominal section width, a 40-series aspect ratio, and an 18-inch rim diameter. On the 2020 BMW M240i, this size serves the front position, where steering response and compatibility with the front wheel setup are especially important. Available options include blackwall tires from BFGoodrich and Nitto in series such as g-Force Comp 2 AS, g-Force Sport Comp 2, Nitto NT555 G2, and g-Force Phenom T/A. This is the size to evaluate when replacing front tires and confirming that rim width and tire specification match the car’s current wheels.
245/35R18 is a metric radial size with a 245-millimeter nominal section width, a 35-series aspect ratio, and an 18-inch rim diameter. On the 2020 BMW M240i, this size is used at the rear, where the wider tread helps support the car’s staggered performance-oriented layout. The available product selection here centers on a blackwall BFGoodrich g-Force Phenom T/A option. This is the size to focus on when replacing rear tires, especially if the car still uses its staggered wheel arrangement rather than a modified square setup.
Sub-model fitment on the 2020 BMW M240i is straightforward in overall layout, but position matters. Coupe and Convertible applications both use the same staggered 18-inch tire arrangement, so the first step is confirming whether you need a front or rear tire.
1
2020 BMW M240i Convertible
The 2020 BMW M240i Convertible follows the same staggered radial setup used across this application. Tire selection starts with confirming whether you are replacing a front or rear tire so the correct size, width, and wheel match stay in place.
The 2020 BMW M240i Convertible Front uses the narrower front tire size in the staggered setup. This is where you can compare available blackwall performance tire options while checking that the wheel width remains appropriate for the selected front tire.
The 2020 BMW M240i Convertible Rear uses the wider rear tire size that completes the staggered arrangement. Rear tire selection should focus on maintaining the correct rear fitment and confirming compatibility with the wheel and suspension setup currently on the car.
The 2020 BMW M240i Coupe uses the same staggered 18-inch radial configuration as the Convertible. Choosing tires here is less about trim differences and more about keeping front and rear positions matched to the correct size.
The 2020 BMW M240i Coupe Front uses the front tire size in the staggered setup. This position offers the broader product choice, so buyers can compare tire series and brand options while staying within the correct front-wheel fitment range.
The 2020 BMW M240i Coupe Rear uses the wider rear tire size on the 18-inch setup. That makes rear replacement more specific, with attention focused on preserving the intended staggered arrangement and verifying the actual wheel width on the car.
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 2020 BMW M240i Tires for Sale
Available 2020 BMW M240i tire choices center on 18-inch blackwall radials from BFGoodrich and Nitto. The front 225/40R18 size offers several g-Force and NT555 G2 series options, while the rear 245/35R18 selection focuses on the BFGoodrich g-Force Phenom T/A.
These FAQs focus on the 2020 BMW M240i’s staggered 18-inch tire setup, front-versus-rear fitment, product selection, and the wheel, suspension, and maintenance checks that matter before putting the car back on the road.
Tire Size & Fitment
What tire size fits a 2020 BMW M240i?
The 2020 BMW M240i uses a staggered 18-inch tire setup with 225/40R18 at the front and 245/35R18 at the rear. Both sizes are radial tires, and this front-and-rear arrangement appears across the covered Coupe and Convertible applications.
That means the first step is identifying which axle needs replacement. A front tire and a rear tire are not the same size, so ordering by year, make, and model alone is not enough unless the tire position is confirmed. It is also smart to verify the actual wheel setup on the car, especially if it has aftermarket wheels or has been converted from staggered to square.
What size rim does a 2020 BMW M240i use?
The primary tire fitments for the 2020 BMW M240i use an 18-inch rim diameter. Both 225/40R18 and 245/35R18 are built around that same 18-inch wheel diameter, even though the front and rear tires differ in width and profile.
Rim diameter is only part of the fitment picture, so it helps to check wheel width as well before choosing a replacement tire. The front and rear tire sizes have different width needs, and that matters even when the wheel diameter matches. A quick inspection of the wheel markings can prevent buying a tire that is correct in diameter but mismatched for the wheel or axle position.
Do all 2020 BMW M240i sub-models use the same tire size?
The covered 2020 BMW M240i Coupe and Convertible share the same overall staggered arrangement, but they do not use one single size at all four corners. Front positions use 225/40R18, while rear positions use 245/35R18.
That makes sub-model identification less important than position identification in most cases. A buyer replacing two front tires can stay focused on the front size, while a rear replacement requires the wider rear size. If the car has had wheel changes, tire rotation experiments, or a square setup conversion, checking all four tires and wheels before ordering is the safest next step.
Choosing the Right Tire
What should I consider when choosing a 225/40R18 tire for a 2020 BMW M240i?
For the 2020 BMW M240i, a 225/40R18 front tire should first match the correct front position and 18-inch wheel setup. After size is confirmed, the main differences come from tire series, brand, rim-width compatibility, and specification details such as load capacity and weight.
The available front options include BFGoodrich and Nitto blackwall radials in several performance-oriented series. That gives room to compare how each tire fits your wheel width and how closely you want to match the existing set on the car. Keeping the same series on both front tires, and ideally matching the rear setup appropriately, helps preserve consistent road manners and appearance.
What sidewall styles are available for 2020 BMW M240i tires?
The available products for the 2020 BMW M240i use a blackwall sidewall style. That applies to both the front 225/40R18 options and the rear 245/35R18 option, so the visual presentation stays modern and understated rather than using stripes, raised letters, or whitewall treatments.
Since sidewall style does not vary here, the real comparison shifts to brand, tire series, and fitment details such as wheel-width range. That can actually simplify the buying decision because the appearance remains consistent across the available choices. If the car already has one tire series fitted on the opposite axle, matching that look and specification closely can help maintain a cohesive overall setup.
What brands offer tires for the 2020 BMW M240i?
Tires for the 2020 BMW M240i are available here from BFGoodrich and Nitto. BFGoodrich appears in both front and rear fitments, while Nitto is offered in the front 225/40R18 size, giving the front axle a broader brand and series selection than the rear axle.
Brand choice should still begin with the correct axle position and size, not name recognition alone. It also helps to compare the tire series within each brand, since those series can differ in specification even when the size is the same. A buyer replacing one pair should think about how closely the new tires will complement what remains on the other end of the car.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2020 BMW M240i?
Yes, modifications can change tire fitment on a 2020 BMW M240i even when the replacement tire matches the original size. Aftermarket wheels, altered offsets, suspension changes, ride-height adjustments, and body modifications can all affect how a 225/40R18 front or 245/35R18 rear tire sits in the car.
That is why it is worth checking actual wheel width, wheel diameter, and clearance before ordering. A modified car may no longer match the original staggered arrangement exactly, and even small changes can affect steering clearance or fender space. Looking at the wheel markings and comparing the current setup side to side can prevent an expensive mismatch.
What should I inspect before driving a 2020 BMW M240i on new tires?
Before driving a 2020 BMW M240i on new tires, inspect the wheels for damage, confirm that the front and rear sizes are mounted in the correct positions, and check inflation pressure carefully. It also makes sense to look over valve stems, tread seating, and any signs of rubbing once the car is back on the ground.
A short initial road test can reveal vibration, pulling, or clearance issues that are easier to correct early. After that first drive, recheck pressure and take another look at the inner fender and suspension clearances, especially if the car has non-stock wheels or recent suspension work. Catching those details early helps the new set perform as intended.
How often should tires on a 2020 BMW M240i be inspected?
Tires on a 2020 BMW M240i should be inspected regularly, not just when tread looks worn. A quick visual check for air loss, uneven wear, cuts, bulges, or sidewall damage is worthwhile before routine driving, and a closer inspection should be part of normal maintenance intervals throughout the year.
That matters even more on a performance car with staggered sizing, because front and rear tires can wear differently and cannot always be rotated in the usual way. Checking pressure consistently is just as important as checking tread. If the car sits for long periods, inspect for flat spotting and age-related deterioration before returning it to regular road use.
