BMW 3-Series E92 Coupe (2006 - ) - Replace Tyres 225/35 R18 with 225/40 R18 on rears?

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Fri 8 Jan 2010 12:34
Replace Tyres 225/35 R18 with 225/40 R18 on rears? - uksant
Hello All

Currently have (18" run flats from new):

225/40 on fronts
225/35 on rears

Want to replace with (non-run flat) winter tyres, and was wondering whether anyone knew if putting 225/40 on the rear was a no-no?

Would also be useful to know why the profile on the rears is lower than the front but the width is the same. Does anyone have any ideas?

Thanks in advance.
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Fri 8 Jan 2010 12:57
Replace Tyres 225/35 R18 with 225/40 R18 on rears? - Bagpuss
I think you'll find you have 255s on the rear, not 225s. You'll also find the wheels front and rear have different widths, 8" at the front and 8 1/2" at the rear. If it were me, I would buy some cheap 16" steel wheels and fit them with 205/55 winter tyres all round. That'll also save your nice alloys getting covered in salt and grit.
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Fri 8 Jan 2010 13:08
Replace Tyres 225/35 R18 with 225/40 R18 on rears? - idle_chatterer
If you've a 330i/d or 335i/d I suspect that the minimum wheel size is 17" due to the brake size, there's a sticker on the driver's door shut with what I assume are the valid wheel/tyre combinations including M+S. AFAIK the only 'standard' UK steel wheels were 16" on the base E90 models before the ES was introduced although I' expect that 17" steel wheels will be available from the continent.

Probably best to check with a BMW dealer ? Post about the different sizes f/r is spot on.

Edited by idle_chatterer on 08/01/2010 at 13:10

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Fri 8 Jan 2010 13:13
Replace Tyres 225/35 R18 with 225/40 R18 on rears? - uksant
I think you'll find you have 255s on the rear not 225s.


Thanks, Bagpuss.

They could well be 255 on rears (wife's car, she told me the sizes over the phone but I could have misheard).

==> if they are 255/35 on rear then could I fit 225/40 on them instead (subject to insurance co & BMW assist approval), because I don't think there are many winter tyres in 255/35 on the market?
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