New tyre's pressure advice

gideon87 · Post by **gideon87** » Sat Nov 10, 2018 11:06 am

Hi all i recently got new alloys for my Z4
front 19" 8.5J ET35 225/19/35
rear 19" 9.5J ET35 255/19/30

and on the tire pressure sticker it shows 2.3 and 2.7 bar for the 18inch options does anyone no the correct PSI/Bar for the new set i have

ben g · Post by **ben g** » Sat Nov 10, 2018 12:21 pm

When I had those size tyres fitted, I just used the standard pressures of 33psi fronts and 36psi rears. Seemed fine, if a little bumpy/firm, but that was probably down to the elastic band width side walls

bmwz430si · Post by **bmwz430si** » Sat Nov 10, 2018 12:27 pm

I use 34 front 36 rear during winter and 36 front 38 rear during summer on my 19”s because of the terrible Greek roads.

MrPT · Post by **MrPT** » Sat Nov 10, 2018 12:43 pm

ben g wrote: ↑Sat Nov 10, 2018 12:21 pm When I had those size tyres fitted, I just used the standard pressures of 33psi fronts and 36psi rears. Seemed fine, if a little bumpy/firm, but that was probably down to the elastic band width side walls

This. 255/30 is going to hurt, whatever pressures your choose!

mr wilks · Post by **mr wilks** » Sun Nov 11, 2018 11:33 am

MrPT wrote: ↑Sat Nov 10, 2018 12:43 pm
ben g wrote: ↑Sat Nov 10, 2018 12:21 pm When I had those size tyres fitted, I just used the standard pressures of 33psi fronts and 36psi rears. Seemed fine, if a little bumpy/firm, but that was probably down to the elastic band width side walls
This. 255/30 is going to hurt, whatever pressures your choose!

I wouldnt go above those numbers (33 & 36psi ) especially with those tyre sizes on 8.5j & 9.5j rim widths

zero comfort for the driver & zero protection for the wheels

, hope its not a daily driver op as that is surely going to end with a buckled or split rim

ben g · Post by **ben g** » Sun Nov 11, 2018 10:23 pm

mr wilks wrote: ↑Sun Nov 11, 2018 11:33 am
MrPT wrote: ↑Sat Nov 10, 2018 12:43 pm
ben g wrote: ↑Sat Nov 10, 2018 12:21 pm When I had those size tyres fitted, I just used the standard pressures of 33psi fronts and 36psi rears. Seemed fine, if a little bumpy/firm, but that was probably down to the elastic band width side walls
This. 255/30 is going to hurt, whatever pressures your choose!
I wouldnt go above those numbers (33 & 36psi ) especially with those tyre sizes on 8.5j & 9.5j rim widths zero comfort for the driver & zero protection for the wheels , hope its not a daily driver op as that is surely going to end with a buckled or split rim

Go any lower than those though and it'll look like you have 4 flat tyres. You'll also meet loads of nosey buggers who want to tell you all your tyres are flat

happened to me loads of times.

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