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What should the tyre pressure be when the tyres have warmed up? Mine have always increased from 27 when cold to 30/31 when warm. I've had car back from service now and the tyres are at 34 when warm. (I've not checked them with a guage just going off what computer is saying)
 

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What tyres are you running and at what speed.
My MPSSs were at 39 yesterday up from 34 when cold, but I was doing 3 figures in a straight line (on a private road!)
 

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It's new to me and the tyres were fitted as part of the deal. I will do a bit of research and likely reduce closer to 30 psi and see how that feels. (mine is lowered and running a lot of camber though so probably doesnt upset the feel of the car as much as standard as to be honest the rear is running a lot on the inner edge of the tyre
 

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On run flats I believe you're looking at 29psi cold rising to 33/34 warm. Looks like the servicer topped your tyres up as they were a little low
 

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I'd recommend setting between 30-32 hot, worth suffering a bit of wallowing while they warm from around 26/27 cold if you go over 32/33 psi you'll start to loose grip, and over 35 you'll be drifting around :) They're very sensitive to tyre pressure due to their width.
 

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Discussion Starter #9
Well I was happy with them at 30 when warmed, haven't driven the car enough yet to know what it's like at 34. The sticker on the fuel cap does say to use higher pressure when doing higher speeds
 

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What about cars fitted with MPSS 275 front 305 rear for road use (pretty bumpy B roads mostly)?

Just bought my car and the pressures were F/L 28psi F/R 29psi R/L 33psi R/R 33psi when cold.

I've just put 30.5psi all round. I'd be interested to hear what others with the same tyres are setting their pressures to.

Thanks
PeterB
 

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Mpss I'd guess 34-35 when cold
I have 275/305 MPSS. Set at 30 psi cold and get to 34 when very hot / used hard. Any higher and loss of traction due to the centre of the tyre peaking.

I find these very sensitive to correct pressure.

Satan
 

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My local tyre place filled mine with nitrogen (for free) before I went to Europe and the pressure doesn't seem to increase more than a couple of pounds when warm.
 

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Dunlops, I stick with 29psi when cold, and they get to 32/33 when nicely heated :)
MPSSs, I go with 32 cold and they get to 34/35 depending on temps, but they feel great on the road and even wet 33 is good.
 

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newbie question:


but if they are filled with Nitrogen, how do you pump them up?
specialist garage?

or do people just put regular air in?
 

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Just pop along to ATS & tell them you just need a nitrogen top-up to whatever PSI you need. They don't even charge...normally! They usually only charge (£5) for a full deflate, purge & re-fill!
 
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