OEM wheel and tire fitment specs for the 2018 BMW M4, including bolt pattern (PCD), center bore diameter, thread size, rim diameter, rim width, wheel offset, and backspacing.
2018 BMW M4 Fitment Specs
Baseline mounting dimensions used for interchange decisions.
Multiple OEM configurations exist for this vehicle. Fitment can vary by trim, brakes, and factory wheel package – confirm your exact setup before buying.
Wheels That Interchange With a 2018 BMW M4
Results are evaluated from bolt pattern, center bore direction, OEM width/offset envelope, and lug hardware – not bolt pattern alone.
Potential requirement: 17.35 mm wheel spacer. Estimated outer position is about 17.35 mm farther inward than the mid OEM package. Use lug nuts / bolts specified for your vehicle.
A normal wheel spacer does not change bolt pattern. Hub rings cannot enlarge a wheel bore that is smaller than the hub. Brake clearance and tire package fitment still require vehicle-specific checks when not confirmed in the dataset.
2018 BMW M4 Wheel Fitment Guide
This page summarizes the wheel and tire data available for the 2018 BMW M4. Some OEM specifications vary by package and axle position. If a spec is not listed here or looks inconsistent, verify it on your vehicle and with OEM sources before purchasing or installing wheels or tires. Use the on-page calculator to compare donor wheels to your M4 and to model custom wheel and tire sizes.
Known OEM fitment for 2018 BMW M4
Bolt pattern
5x120
Center bore
72.6 mm
Thread size
M14 x 1.25
Rim diameter
19 in
Rim width
9.0 in
Wheel offset (ET)
29 mm
Backspacing
5.64 in
Tire section width
255 mm
Tire aspect ratio
40
Tire rim diameter
18 in
Notes: OEM wheel and tire sizes on the M4 can be staggered and can vary by package. The values above reflect known data points but may not represent both axles or all trims. The listed rim diameter and tire rim diameter show both 19 inch and 18 inch equipment in the data. Backspacing can be listed differently depending on how the wheel lip is accounted for. Always confirm what is on your specific vehicle before ordering parts.
For reference only, a 255/40R18 tire is approximately 26.0 in overall diameter. Use this as a comparison point in the calculator, not as a guarantee of your factory size.
How to use the Wheel Interchange Calculator
Set Installed on to 2018 BMW M4. Set Wheels from to your donor vehicle or wheel source.
Use Custom wheel size to model diameter, width, and offset. Use Custom tire size to set section width and aspect ratio.
When you change rim diameter, the tool updates tire diameter in the comparison so you can keep overall diameter in a safe range.
Review:
Inner clearance change to strut and suspension.
Outer position change at the fender lip.
Ride height change from tire diameter difference and the resulting speedometer variance.
If your OEM size is not fully known, start with the values above, then adjust to match your door-jamb tire label or current tire sidewall markings.
Fitment guidance and safety checks
Offset and width work together. Lower offset or wider wheels push outward. Higher offset or narrower wheels tuck inward. Model both in the calculator to avoid fender contact or inner interference.
Brake clearance is critical. Visually and physically test for spoke and barrel clearance over calipers. Do not rely on diameter alone.
Tire diameter should stay close to OEM to protect ABS and stability control behavior. Use the calculator to compare overall diameter and speedometer impact.
Staggered setups may be present from the factory. If unknown, verify front and rear sizes individually on the vehicle or with OEM documentation.
Backspacing values can vary by source because some measurements include the wheel lip. When in doubt, measure your wheel directly and use the calculator to cross-check.
TPMS compatibility can vary by wheel and sensor. Reuse compatible sensors or source correct replacements for your model year.
Hardware and installation essentials
Bolt pattern 5x120 must match the wheel exactly. Do not attempt to fit mismatched patterns.
Center bore 72.6 mm. If the aftermarket wheel has a larger bore, use hub-centric rings sized to 72.6 mm at the hub and your wheel’s bore on the outer side. Never use rings to adapt a smaller bore to a larger hub.
Thread size M14 x 1.25. Use the correct seat type specified by the wheel manufacturer and the correct fastener length, especially if spacers are used. If spacers are added, longer wheel bolts must provide sufficient thread engagement. Spacers are not recommended unless you fully validate clearance and hardware requirements.
Tightening torque is not provided here. Confirm in the BMW owner’s manual or service information for your VIN. Re-torque after 50 to 100 miles of driving.
How to confirm your exact OEM sizes
Door-jamb tire label shows factory tire sizes and pressures for your trim.
Check current tire sidewalls for size on each axle and compare to the calculator.
Inspect the back of your wheel for stamped width, diameter, and offset markings. Common formats include 9Jx19 ET29.
Use your VIN with an official BMW parts catalog or dealer to confirm wheel part numbers and specifications for your exact build.
If backspacing is unclear, measure your wheel directly with a straightedge and ruler or caliper, then verify with the calculator.