Hey, I bought a set of 19's a while ago the tires are 245/35R19 93W Achilles ATR Sport Tyres, ideally what psi should i be running, as i have no idea. All i know is they have around 40 in them now which is what they came with.
Last edited by WHYtheFACE; 30-01-2012 at 05:28 PM. Reason: typo
40 is ok, maybe 42-43 i am unsure with 19s, but most definately wouldnt go lower than 38psi
The tyres will have a maximum rating on the sidewall, stay below that. More or less: the higher pressure you go, the better fuel economy you will receive, but less grip, bumpier ride (to a certain extent), the lower you go, more tyre wear, more grip, better ride (to a certain extent).
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I'm fairly certain the max pressure on them is 55 PSI, if i remember correctly they had probably 42-43 in them. Just though i should ask as every time i mentioned to someone they were like what thats way to high. But i guess all they know is how much their 16's take :P
generally run a higher pressure, i run about 46-48 in my 18s. you get better fuel economy and the myth more pressure= less grip is a lie. the more pressure you have (realistic values) the better grip you will have, better water dispersing capabilities, less flex etc
A general rule of thumb we use here is this:
>55 - 32psi
50 - 34psi
45 - 36psi
40 - 38 psi
35 - 40psi
30 - 42psi
so for 245/35R19 - stay around 40psi.
Pressure settings come down to so many factors but we use this guide for a number of reasons. We generally get good, regular tyre wear at these pressures whilst maintaining the highest level of comfort possible for the given tyre profile. Once you get up to 40 profile and below, you really need to start thinking about wheel protection as well as comfort. The more pressure in the tyre the less likely the sidewall will flex/pinch when impacted and the more likely the tyre will protect the rim from damage.
If you are at all unsure, I would start with 40psi and re-assess after 5000kms. Check how even the wear is: if the inside is wearing you may have a little too much pressure (keep in mind what I said about wheel protection though). If the outer edges are wearing then you could probably increase pressures a bit.
Unfortunately there is no exact number to put on pressures but trial and error and regular maintenance are the best approach.
I currently have 225/55R16 tyres on my WH Statesman (the wheels/tyres from factory). It says on the tyre placard to put 26 PSI under normal conditions, which is what I have been doing. I have noticed that you can't feel the bumps as much as I did when they had 36 PSI and they seem to grip better. Haven't noticed any difference in fuel economy, gets about 9.5L/100kms.
Is 26 PSI not enough? Tyres are Bridgestone Turanza ER300. I assume that because thats what it says on the placard, it has to be right?
Remember it's a personal choice though - whatever works for you.
The tyres seem to be waring evenly. The rear tyres were wearing out on the inner edge but thats because the car is so low haha. But 26 PSI just doesn't seem like enough air. I used to aways put 35 PSI in all my tyres, until I read what pressure it says to put in them on the placard. But thanks for your help and advice
in my experience of 10 yrs fitting tyres, [ Bridgestone, Beaurepaires, Yokohama, Michelin, Federal, ETC..]
i generally put air pressures of:
13" = 30psi
14" = 32psi
15" = 34psi
16" = 36psi
17" = 38-40 psi [ depends on profile]
18", 19" = 40-42psi
20" and up = 42psi front, 38-40psi rear
i have 19" rims on my vs [ sl's front, ssl rears] with 245/35r19 and i run 42-44 front, and 36-40 rear.. i get even wear, no scrubbing and best wear especially on highway or city driving..