Hello I would like to ask a quick question. What is the right size for BMW Z4M for Michelin Supersport with standard wheels?
255/40/18
225/45/18
or
255/45/18
225/45/18
???
Not joined yet? Register for free and enjoy features such as alerts, private messaging and viewing latest posts and topics.
Michellin Supersport PSS correct size
- buzyg
- Legend
- Posts: 26532
- Joined: Fri May 20, 2011 6:11 pm
- Location: Cornwall
-
- Lifer
- Posts: 12722
- Joined: Sun Nov 30, 2008 1:03 pm
- Location: Liverpool
- Contact:
Michellin Supersport PSS correct size
First option is correct - which keeps the front to rear tyre ratio the same despite the wider rear tyre.
If you did the 2nd option, you'd end up with a rear tyre profile that was about 1cm taller than the front:
If you did the 2nd option, you'd end up with a rear tyre profile that was about 1cm taller than the front:
- 225/45r18 = 660mm diameter
- 255/40r18 = 661mm diameter
- 255/45r18 = 687mm diameter
- 265/40r18 = 669mm diameter
Last edited by mmm-five on Thu Oct 21, 2021 9:39 am, edited 1 time in total.
- Mr Tidy
- Legend
- Posts: 23838
- Joined: Wed Jul 02, 2014 12:18 pm
- Location: North West Surrey
Michellin Supersport PSS correct size
Yes, the first option is factory sizes.
But when I bought new tyres in April I went with your 2nd option for a bit more sidewall and haven't had any issues - plus they fill the wheelarches a bit more!
But when I bought new tyres in April I went with your 2nd option for a bit more sidewall and haven't had any issues - plus they fill the wheelarches a bit more!
Coupes because stunning!
Current - Silver Grey MC, Imola Red heated Nappa & carbon trim. Aeros, H & R Coil-overs, 224s, OE Strut brace, Nav, cup-holders, DSP Hi-Fi, pdc, cruise, MFSW, no CDV! E90 330i daily
Gone - Montego Blue
Gone - Ruby Black
Current - Silver Grey MC, Imola Red heated Nappa & carbon trim. Aeros, H & R Coil-overs, 224s, OE Strut brace, Nav, cup-holders, DSP Hi-Fi, pdc, cruise, MFSW, no CDV! E90 330i daily
Gone - Montego Blue
Gone - Ruby Black
-
- Member
- Posts: 243
- Joined: Sat May 14, 2011 11:18 pm
Michellin Supersport PSS correct size
Perfect. Thank you guys for your immediate response.
- Argenta
- Senior Member
- Posts: 1051
- Joined: Sat Feb 07, 2015 7:49 pm
Michellin Supersport PSS correct size
I do believe the answer was much closer than this forum; either on the note by your driver door or in the owners manual.
-
- Lifer
- Posts: 12722
- Joined: Sun Nov 30, 2008 1:03 pm
- Location: Liverpool
- Contact:
Michellin Supersport PSS correct size
Assuming the OP was with the car!
The internet is with you 90% of the time even when you're in another county/country without the car!
- Argenta
- Senior Member
- Posts: 1051
- Joined: Sat Feb 07, 2015 7:49 pm