2019 BMW 440i — Gran Coupe M Sport

The 2019 BMW 440i Gran Coupe M Sport shipped with 5 different factory tire sizes, depending on the wheel package it left the factory with (this can also reflect a staggered front/rear setup). Check your tire sidewall or door placard to confirm which one applies to your vehicle.

This trim shipped with more than one tire size (staggered fitment, front/rear, or optional wheel package). Confirm which one matches your vehicle by checking your tire sidewall or door placard.

225/45R18

Section width225 mm
Aspect ratio (sidewall height)45% (101.3 mm)
Rim diameter18"
Overall tire diameter~26"
Revolutions per mile~777

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225/45R18 (Front)

Section width225 mm
Aspect ratio (sidewall height)45% (101.3 mm)
Rim diameter18"
Overall tire diameter~26"
Revolutions per mile~777

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255/40R18 (Rear)

Section width255 mm
Aspect ratio (sidewall height)40% (102 mm)
Rim diameter18"
Overall tire diameter~26"
Revolutions per mile~775

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225/40R19 (Front)

Section width225 mm
Aspect ratio (sidewall height)40% (90 mm)
Rim diameter19"
Overall tire diameter~26.1"
Revolutions per mile~773

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255/35R19 (Rear)

Section width255 mm
Aspect ratio (sidewall height)35% (89.3 mm)
Rim diameter19"
Overall tire diameter~26"
Revolutions per mile~775

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What this size means for your BMW 440i

On the 2019 BMW 440i Gran Coupe M Sport, the factory 225/45R18 measures about 26″ in overall diameter with a 101.3 mm (4″) sidewall, and completes roughly 777 revolutions per mile. Its 45-series aspect ratio gives a low-profile sidewall tuned for sharper handling, common on sport trims and larger-wheel packages. In tire terms it is a passenger (P-metric / Euro-metric) size.

The 225/45R18 and 225/45R18 roll within 0″ (0%) of each other in overall diameter, so they are interchangeable from a speedometer standpoint — the second size is an optional wheel package rather than a different rolling size.

Other 2019 BMW 440i trims

BMW 440i tire sizes by year

See every BMW 440i year & trim →

How to read a tire size

A tire size like 225/45R17 breaks down into three parts: the first number is the section width in millimeters (the tire's width from sidewall to sidewall), the second is the aspect ratio — the sidewall's height as a percentage of that width — and the number after the "R" is the rim diameter in inches. A letter prefix (P or LT) indicates Passenger or Light Truck construction; its absence usually means Euro-metric sizing.

Some trucks and off-road tires instead use "flotation" sizing, like 37X12.50R17 — here the numbers are the tire's overall diameter and width in inches directly, with the rim diameter last.

Always verify against the tire information placard on your driver's-side door jamb or your owner's manual before purchasing — tire size can vary by factory option package even within the same trim.