225/40 R18 Correct Tire Pressure?

eliboi · #1 (**permalink**) 09-16-2010, 06:06 AM

Hi, I recently bought a 2000 VW New Beetle and it have Dunlop 225/40 R18 88W Le Mans LM703 (Tyres Dunlop LM703 tyre size 225/40 R18 - www.iTyre.com) on it. I cant find the max pressure on the sidewall.

What is the correct psi of my tires? Im currently at 30psi

*Already replaced air filter, engine oil, oil filter, fuel filter and still low average of 15 mpg.

eliboi · #2 (**permalink**) 09-16-2010, 07:59 AM

searched the forum and saw a post using the same tire size and he's saying psi 32/32.. hope this works

Franco2112 · #3 (**permalink**) 09-16-2010, 12:52 PM

Max inflation is 51psi. For better mileage use 35 to 40 psi in all tires. My suggestion.
Similar tire. Dunlop Direzza DZ101 225/40 R18 88W
Franco

eliboi · #4 (**permalink**) 09-17-2010, 03:37 AM

Quote:

Originally Posted by Franco2112

Max inflation is 51psi. For better mileage use 35 to 40 psi in all tires. My suggestion.
Similar tire. Dunlop Direzza DZ101 225/40 R18 88W
Franco

will i use 40 on all tires or its different in front and rear?

Franco2112 · #5 (**permalink**) 09-17-2010, 03:49 AM

Equal pressure in all, front to rear.
Franco

eliboi · #6 (**permalink**) 09-17-2010, 04:42 AM

Quote:

Originally Posted by Franco2112

Equal pressure in all, front to rear.
Franco

Okay

thanks a lot!

simonsi · #7 (**permalink**) 09-17-2010, 09:42 AM

You may start to wear the tyres mostly in the centre of the tyre width with pressures that high...

eliboi · #8 (**permalink**) 09-20-2010, 08:04 AM

Quote:

Originally Posted by simonsi

You may start to wear the tyres mostly in the centre of the tyre width with pressures that high...

what pressure do you suggest sir?

knownaschubs · #9 (**permalink**) 09-26-2010, 10:45 AM

well i work at discount tire, for a tire that small 40 is way too high and does wear only in the center. i'm currently running 32 so that when the tires do warm up after a little bit of driving the air pressure increases to about 35-36. and yes a couple of pounds of air does make a difference with such a small tire. at 40 psi, when your tires warm up it'll be around 45-46

simonsi · #10 (**permalink**) 09-26-2010, 08:46 PM

Quote:

Originally Posted by eliboi

what pressure do you suggest sir?

If you have no other info then I would start at 32-34psi and monitor the wear across the tyres and adjust to ensure even wear.

eliboi · #11 (**permalink**) 09-29-2010, 02:28 AM

thanks for the suggestions! currently at 35 psi, and noticed a huge change in fuel consumption

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