im confused about tyre pressure's, help plz :(

[splatrat]

i have 19 inch wheels on a 2007 tdi fr and am really confused as to what my tyre pressures should be .............can anyone help?

thanks

sorry the tyre size is 235/35/19

 

[FAST AL]

Well my 17s run on 29psi rears and 32psi fronts if it's any help at all.Fronts need more due to heavy engine.Nowt in boot usually.

 

[splatrat]

well i was told to put 35 in rears and 37 in fronts would that be right or not?

 

[alx_chung]

What does it say on your filler cap? The tyre pressures are on there.
For my PD140 its 32/29.
Alex

 

[splatrat]

yes they are there, but surely they would of changed due to me changing from 17's to 19's??

 

[alx_chung]

yes they are there, but surely they would of changed due to me changing from 17's to 19's??

Nope they stay the same. I have 18s on mine and keep to the same tyre pressures.
Alex

 

[FAST AL]

Look at a psi list at a garage or motor factors if your unsure.I reckon should be about same or only a couple of psi more.Halfrauds may have the info.

 

[FAST AL]

Thought that may be the case alx.

 

[FAST AL]

Best to check somewhere anyway for peace of mind if nothing else splatrat.Try a tyre firm.

 

[leoncp11]

yep got 19s and running on the same as standard psi
it makes no difference on wheel size chris

 

[roney1986]

I keep 30 psi all round.

 

[leon_lib]

when i got my alloys i was told to run 35psi all round

 

[FAST AL]

35psi all round would eventually wear the middles out same as 30psi all round will eventually wear out the edges of the fronts a bit but near enough ok for the rears.Best off sticking to the correct spec: which is 29psi rear and 32psi front with normal load,unless you drive all over with 4 passengers and/or a large load in the boot. Give or take the odd psi. NEVER EXCEED 32 or 33 psi EVER or buy new tyres sooner.

 

[splatrat]

i have since changed to the pressure stated inside the fuel cap

 

[leon_lib]

35psi all round would eventually wear the middles out same as 30psi all round will eventually wear out the edges of the fronts a bit but near enough ok for the rears.Best off sticking to the correct spec: which is 29psi rear and 32psi front with normal load,unless you drive all over with 4 passengers and/or a large load in the boot. Give or take the odd psi. NEVER EXCEED 32 or 33 psi EVER or buy new tyres sooner.

but with a different size tyre in my case being larger wouldnt the new tyre need more psi to fill as the older was smaller or am i just being thick?

 

[silverfox]

Air pressure remains the same, whatever tyre size goes on.

 

[leon_lib]

Air pressure remains the same, whatever tyre size goes on.

Ok I'll drop them to that but iv just top them up after bein on hol to 35psi and they feel loadz better

 

[FAST AL]

They've maybe got a bit better handling but as I said middles will wear out on them at 35 psi.

 

[FAST AL]

A larger tyre size only means you need to put more in to fill it = volume. psi remains the same.
Only more air needed.

 

[leon_lib]

A larger tyre size only means you need to put more in to fill it = volume. psi remains the same.
Only more air needed.

That makes sense now I'll drop the psi then