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Old 04-14-2004, 04:01   #1 (permalink)
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18" tyre pressure

Anyone have any recommendations about tyre pressures for the OEM optional 18" tyres fitted to the BA XR6/8?

The tyres are wearing prematurely on my car - the outsides are wearing quicker than the middle which means that the recommended 35-39 PSI I have been running may not be enough.
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Old 04-14-2004, 04:56   #2 (permalink)
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Re: 18" tyre pressure

When i had my BA XR6 i ran the tyres at 38 psi, and not a problem, The tyre place said to run my FPV GT's tyres at 40psi as the car is heaver, If the tyres are wearing on the out sides it means the tyre pressure is to low, and if they wear in the middle the pressure is to high. Hope this has helped.
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Old 04-14-2004, 05:21   #3 (permalink)
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Re: 18" tyre pressure

Thanks for that.

I'm trying 42 PSI to see if I can get some life out them (they had over 42 when the car was delivered and now I know why).
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Old 04-14-2004, 05:49   #4 (permalink)
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Re: 18" tyre pressure

I would HIGHLY recommend running nitrogen in your rubbers......unless you've got camber problems (fix that first), N2 will make for a more even footprint and hence wear pattern.

Cheers.........
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Old 04-14-2004, 19:13   #5 (permalink)
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Re: 18" tyre pressure

Actually, nitrgoen does little to nothing for "more even foot print and wear pattern" - it's not like it squares the tyres up or anything. The only benefit nitrogen has is that it is less affected by temperature, and therefore pressure variations, under extreme conditions. For day to day driving, there would be no need to put nitrogen in your tyres - for track days, there may be some benefit as the tyre pressure will remain more constant.

Blood_Orange - I use 39/40 in my 17's, so 42 in an 18" tyre would not be out of the question as an appropriate inflation pressure to use.
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Old 04-14-2004, 19:21   #6 (permalink)
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Re: 18" tyre pressure

Quote:
Originally Posted by JC
Actually, nitrgoen does little to nothing for "more even foot print and wear pattern" - it's not like it squares the tyres up or anything. The only benefit nitrogen has is that it is less affected by temperature, and therefore pressure variations, under extreme conditions. For day to day driving, there would be no need to put nitrogen in your tyres - for track days, there may be some benefit as the tyre pressure will remain more constant..
When i last got tyres fitted i asked about nitrogen and got told that it really isnt worth it unless you are racing your car, as any advantage in the milage you get out of the tyres is minial and the extra cost of the nitrogen filling isnt worth it. Normal air is over 70% Nitrogen anyway. BTW I run about 40-42Psi with 17's
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Old 04-14-2004, 19:37   #7 (permalink)
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Re: 18" tyre pressure

I put 42 in the front and 38 in the rears last time from memory.
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Old 04-14-2004, 20:12   #8 (permalink)
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Re: 18" tyre pressure

I run 45psi, in my 265/30/19's
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Old 04-15-2004, 03:11   #9 (permalink)
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Re: 18" tyre pressure

Quote:
Originally Posted by JC
Actually, nitrgoen does little to nothing for "more even foot print and wear pattern" - it's not like it squares the tyres up or anything. The only benefit nitrogen has is that it is less affected by temperature, and therefore pressure variations, under extreme conditions. For day to day driving, there would be no need to put nitrogen in your tyres - for track days, there may be some benefit as the tyre pressure will remain more constant.

Blood_Orange - I use 39/40 in my 17's, so 42 in an 18" tyre would not be out of the question as an appropriate inflation pressure to use.
Your tyre pressure just doesn't vary under "extreme conditions", unless your saying driving above 60kph is extreme??? Do your self a favour before posting negatives......buy a "good" tyre gauge.....check your pressures cold.....say before you drive to work....check again when you get to work...pressure would have varied greatly (> 2psi) which DOES effect wear patterns!!! This is even more so if you use freeways,highways,etc.
But, each to their own......lead a horse to water.....can't make em drink.
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Old 04-16-2004, 00:39   #10 (permalink)
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Re: 18" tyre pressure

blood-orange stay with the 42psi thats what im running in my baxr6 done 45000k now and should get another 15000 till they need to be replaced BUT as you said they are wearing the outside edges so that tells me its an alignment problem good luck greg venom XR6
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