BMW M135i F20/F21 Tyre Sizes

TyreTestLab fitment note

Check the correct model generation

This page is for the F20/F21 BMW M135i only. It is not for the later F40 BMW M135i xDrive.

Always check your vehicle handbook, door placard and wheel markings before buying or fitting tyres.

Factory and commonly listed tyre fitments for this specific model page.

Setup	Front tyre	Rear tyre	Front wheel	Rear wheel	Notes
Official BMW staggered 18 inch setup	225/40 R18	245/35 R18	7.5J x 18	8J x 18	BMW 2012 M135i data lists this staggered front and rear setup.

These examples are for comparison only. Confirm load rating, speed rating, clearance, insurance and manufacturer approval before changing size.

Current size	Alternative size	Diameter difference	Notes
225/40 R18	245/35 R18	-1.33%	Comparison between the official BMW front and rear staggered tyre sizes.

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Clearance

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Insurance

Compare rolling diameter, sidewall height and speedometer difference before choosing an alternative tyre size.

This page is for the older BMW M135i F20/F21. It is not for the later F40 BMW M135i xDrive.

BMW technical data lists 225/40 R18 88Y front and 245/35 R18 88Y rear with 7.5J x 18 front and 8J x 18 rear wheels.

Do not assume F40 sizes fit the F20/F21 model. Check your vehicle handbook, door placard, wheel size and manufacturer approval.

Official BMW data showing 225/40 R18 front and 245/35 R18 rear for the M135i.