Hi All,
I have 19" wheels on my Macan S (2015). The rear has 255/50R19 tyres and the front tyres are marked 235/55R19. I have the opportunity of a rear spare spare wheel with 255/50R19. In an emergency (e.g. puncture) could I put that wheel on the front to get to a garange ?
Apologies for my ignorance in these things.
Ta.
Tyre sizes and emergency use of back wheel on front
- Nuclear Nick
- Posts: 3814
- Joined: Wed Feb 17, 2016 3:42 pm
- Location: Bristol
I wouldn’t advise that. You might get contact with the inner rim or tyre on or near full lock or with suspension movement. That could be dangerous and expensive. I don’t know where you are but certainly in the UK it would be classed as a modification, not approved by the manufacturer, and as a result your insurance would be invalid. It would almost certainly be illegal too.ouzel wrote: ↑Tue Jan 19, 2021 11:48 am Hi All,
I have 19" wheels on my Macan S (2015). The rear has 255/50R19 tyres and the front tyres are marked 235/55R19. I have the opportunity of a rear spare spare wheel with 255/50R19. In an emergency (e.g. puncture) could I put that wheel on the front to get to a garange ?
Apologies for my ignorance in these things.
Ta.
Nick
Defender 90 V8
991.2 C2 GTS
Macan Turbo - sold
BMW K1300S, BMW R1250 GSA
Defender 90 V8
991.2 C2 GTS
Macan Turbo - sold
BMW K1300S, BMW R1250 GSA
It's not just the tyre tread width you have to think about. The front wheels are 8J and the rear 9J. So at full lock, there's a risk of the wheel rim fouling the wheel arch but also because of the wider wheel the tyre width will be greater at the widest point of the sidewall. I fully support everything Nick said.
Peter
Current: 2020 Carmine Red GTS http://www.porsche-code.com/PMST9ZI9
Gone- 2015 Sapphire Blue Diesel
Gone -2013 Cayenne Diesel
Current: 2020 Carmine Red GTS http://www.porsche-code.com/PMST9ZI9
Gone- 2015 Sapphire Blue Diesel
Gone -2013 Cayenne Diesel
No. Don't do it.ouzel wrote: ↑Tue Jan 19, 2021 11:48 am Hi All,
I have 19" wheels on my Macan S (2015). The rear has 255/50R19 tyres and the front tyres are marked 235/55R19. I have the opportunity of a rear spare spare wheel with 255/50R19. In an emergency (e.g. puncture) could I put that wheel on the front to get to a garange ?
Apologies for my ignorance in these things.
Ta.
Steve
2020 GTS in Sapphire Blue
(sold) 2017 SD in Rhodium Silver
2020 GTS in Sapphire Blue
(sold) 2017 SD in Rhodium Silver
Surely it depends on the offset of the wheels? My front wheels have 265 tyres and I assume at least 9J, so why wouldn’t a 255 on a 9J work if the offset is correct for the front?
June 2017 Macan GTS in Carmine red with 21” gloss black sport classics, GTS leather package, Air, PASM, PDLS+, pano roof, Sports Chrono, 18 way seats, BOSE, surround view, heated seats front and rear, carbon side blades and carbon interior package.
From Macan Brochure:wheel sizes for Macan and Macan S
Wheels Front: 8 J × 18 ET 21, Rear: 9 J × 18 ET 21
Tyres Front: 235/60 R 18, Rear: 255/55
The wheel widths and offsets don't change for the larger wheel sizes.
Peter
Current: 2020 Carmine Red GTS http://www.porsche-code.com/PMST9ZI9
Gone- 2015 Sapphire Blue Diesel
Gone -2013 Cayenne Diesel
Current: 2020 Carmine Red GTS http://www.porsche-code.com/PMST9ZI9
Gone- 2015 Sapphire Blue Diesel
Gone -2013 Cayenne Diesel
Yes they do, my rears are 10J ET19 and my fronts are 9J ET26 (21" Turbo wheels), hence my thinking that a 9J width is fine on the front if the offset is correct.
June 2017 Macan GTS in Carmine red with 21” gloss black sport classics, GTS leather package, Air, PASM, PDLS+, pano roof, Sports Chrono, 18 way seats, BOSE, surround view, heated seats front and rear, carbon side blades and carbon interior package.
A bit more digging, I have found that the 18" rears are 9J ET 21 (as Peter said), so in my opinion the rears will fit on the front as the offset is only 5mm different (further away from the suspension) than the 21" standard 9J front wheels, and the tyres are narrower by 10mm so that will compensate for the offset difference.
June 2017 Macan GTS in Carmine red with 21” gloss black sport classics, GTS leather package, Air, PASM, PDLS+, pano roof, Sports Chrono, 18 way seats, BOSE, surround view, heated seats front and rear, carbon side blades and carbon interior package.
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