NaturallyBuilt Posted June 8, 2013 Share Posted June 8, 2013 Anyone know the tyre pressure for standard ray 18 inch wheels front and rear? Quote Link to comment Share on other sites More sharing options...
BulletMagnet Posted June 8, 2013 Share Posted June 8, 2013 35psi front and back Quote Link to comment Share on other sites More sharing options...
NaturallyBuilt Posted June 8, 2013 Author Share Posted June 8, 2013 Thanks BulletMagnet. Would of thought front and back would of been different Quote Link to comment Share on other sites More sharing options...
BulletMagnet Posted June 8, 2013 Share Posted June 8, 2013 (edited) Pressure is pressure, even if the rears are wider. Consider this, if you submerged a a 10 litre ballon and a 100 litre ballon under water although they displace different amounts of water they can both use the same amount of pressure to reach their maximum displacement. Provided they are both at the same depth and in the same fluid Edited June 8, 2013 by BulletMagnet 1 Quote Link to comment Share on other sites More sharing options...
HaydnH Posted June 8, 2013 Share Posted June 8, 2013 If you forget again it says just inside the door. 1 Quote Link to comment Share on other sites More sharing options...
ioneabee Posted June 8, 2013 Share Posted June 8, 2013 physics lessons as well - boyles law ? ..................... long,long time ago so probably wrong Quote Link to comment Share on other sites More sharing options...
Ekona Posted June 8, 2013 Share Posted June 8, 2013 Depends on tyres. Higher for soft sidewalls, lower for stiff ones. 35 is a good place to start regardless though. Quote Link to comment Share on other sites More sharing options...
glrnet Posted June 8, 2013 Share Posted June 8, 2013 Pressure is pressure, even if the rears are wider. Consider this, if you submerged a a 10 litre ballon and a 100 litre ballon under water although they displace different amounts of water they can both use the same amount of pressure to reach their maximum displacement. Provided they are both at the same depth and in the same fluid So is that just for wet tyres? Quote Link to comment Share on other sites More sharing options...
taras Posted June 8, 2013 Share Posted June 8, 2013 on the tyre it should say max pressure. Just make sure you dont exceed it. General rule is the lower the profile the greater the pressure should be. Quote Link to comment Share on other sites More sharing options...
Ekona Posted June 8, 2013 Share Posted June 8, 2013 on the tyre it should say max pressure. Just make sure you dont exceed it. General rule is the lower the profile the greater the pressure should be. NO NO NO NO NO Do NOT go anywhere near the max tyre pressure! It will be around 55-60 psi, which if you inflate to that will leave you with a tiny grip patch with all the hazards that entails, along with wearing through the centre of the tread in no time! Profile is not related to pressure. Sidewall flex is, as that's where you exert the loads on the tyre under cornering. Yes, lower profile tyre often have stiffer sidewalls and as such may require higher pressures, but tyre construction is far more important than profile size in determining pressure. Quote Link to comment Share on other sites More sharing options...
JetSet Posted June 9, 2013 Share Posted June 9, 2013 [ Do NOT go anywhere near the max tyre pressure! It will be around 55-60 psi, which if you inflate to that will leave you with a tiny grip patch with all the hazards that entails, along with wearing through the centre of the tread in no time! Yeah, I checked out an old set of the dreaded NK's that I have, 81 psi max . Pete Quote Link to comment Share on other sites More sharing options...
taras Posted June 9, 2013 Share Posted June 9, 2013 (edited) Sorry I think you've misunderstood me. Im not saying it needs to be max pressure just dont exceed it. Ive alwasy been told that the wider and lower profile, the pressure should be a bit more. Of course its dependant on the type of car and load it has. See this chart of BMW cars which vary from 15" narrow to wide 19". http://www.puretyre.co.uk/bmw-tyre-pressures But if you have stock rims its best to go by the figures written in the door shut or enter your reg here http://www.kwik-fit.com/tyre-pressure.asp Edited June 9, 2013 by RT-Performance Quote Link to comment Share on other sites More sharing options...
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