Before changing tyre size
Check
Load index
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Speed rating
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Clearance
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Insurance
TyreTestLab fitment note
Check the correct model generation
This page is for the F40 BMW M135i xDrive only. It is not for the older F20/F21 six-cylinder BMW M135i.
Always check your vehicle handbook, door placard and wheel markings before buying or fitting tyres.
Common tyre sizes
Factory and commonly listed tyre fitments for this specific model page.
| Setup | Front tyre | Rear tyre | Front wheel | Rear wheel | Notes |
|---|---|---|---|---|---|
| Official BMW standard 18 inch setup | 225/40 R18 | 225/40 R18 | 8J x 18 | 8J x 18 | BMW 11/2020 M135i xDrive data lists 225/40 R18 92Y XL front and rear. |
| Retailer compatibility listing 18 inch | 205/45 R18 | 205/45 R18 | Retailer compatibility listing only. Check the vehicle placard and BMW approval. | ||
| Retailer compatibility listing 19 inch | 235/35 R19 | 235/35 R19 | Retailer compatibility listing only. Confirm exact wheel and tyre approval before fitting. |
Conversion examples
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 | 235/35 R19 | +1.55% | Common 19 inch compatibility comparison. Check wheel specification and approval. |
| 225/40 R18 | 205/45 R18 | +0.71% | Retailer compatibility comparison. Check vehicle placard before fitting. |
Use the tyre size calculator
Compare rolling diameter, sidewall height and speedometer difference before choosing an alternative tyre size.
FAQs
Is this page for the F40 or F20/F21 BMW M135i?
This page is for the BMW M135i xDrive F40. It is not for the older F20/F21 six-cylinder BMW M135i.
What is the official 18 inch tyre size for the BMW M135i xDrive F40?
BMW 11/2020 technical data lists 225/40 R18 92Y XL front and rear with 8J x 18 wheels.
Are 19 inch tyres listed for the BMW M135i xDrive F40?
BMW describes 19 inch wheels as optional. Retailer compatibility listings commonly show 235/35 R19, but you should confirm your exact vehicle and wheel approval before fitting.
Sources and notes
BMW Group PressClub - BMW 1 Series specifications valid from 11/2020
Official BMW data showing M135i xDrive with 225/40 R18 92Y XL and 8J x 18 wheels.
BMW Group PressClub - BMW M135i xDrive dynamics article
BMW article noting 18 inch M light alloy wheels as standard and optional 19 inch wheels.
TyreLeader BMW 1 Series F40 M135i xDrive compatibility listing
Retailer compatibility listing showing 205/45 R18, 225/40 R18 and 235/35 R19.