Tire Size Specification
VIN Verification Required2018 BMW 640i — Tire Size
Recommended interval: Rotate every 5,000–7,500 miles; check cold PSI monthly
Factory Tire Size
245/45R18 / 245/40R19
Rear Factory Size
245/45R18 / 245/40R19 / 275/35R19
Technical Specifications
| Front Tire Size | 245/45R18 / 245/40R19 |
|---|---|
| Rear Tire Size | 245/45R18 / 245/40R19 / 275/35R19 |
| Rim / Wheel Size | 18" |
| Matched Trims | Convertible, Convertible Staggered Tires, Gran Coupe |
Compatible Aftermarket Options
Direct OEM cross-references- Buy Michelin / Continental / Pirelli 245/45R18 on AmazonMichelin / Continental / Pirelli245/45R18
Search query: 245/45R18 tire
DIY Fitment & Verification Checklist for 2018 BMW 640i
- Confirm your engine code or trim variant above before ordering parts, as mid-year production changes can affect tire size fitment.
- When purchasing OEM or aftermarket brands (Motorcraft, ACDelco, Mopar, Wix, Fram, Mobil 1, Bosch, NGK), cross-check the Amazon Garage Confirmed Fit badge with your 17-digit VIN.
- Always consult your 2018 BMW 640i owner's manual for exact torque specs and fluid service intervals.
Sources: NHTSA vPIC & OEM Service SpecificationsReport an inaccurate spec or part number
Frequently Asked Questions
What is the OEM tire size specification for a 2018 BMW 640i?
The primary OEM tire size part number / specification for the 2018 BMW 640i is 245/45R18 / 245/40R19.
Which aftermarket tire size brands fit the 2018 BMW 640i?
Compatible aftermarket options include Michelin / Continental / Pirelli 245/45R18.