Wider lower profile tyres = lower pressure?

thecremeegg said:
lol @ this thread - all he asked for was bloody tire pressures and yet everyone has a go at him....typical OCUK motors tbh, when will people get off their high horses and actually act like compassionate human beings :rolleyes:
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He asked for tyre pressures, which he then ignored, so he could fit wheels and tyres, which were the wrong size, onto someones car who then paid him for the work :p
 
I'm 99% sure the tyre pressures will be identical to what they used to be.

All it means is that less air will be required inside the tyre to achieve the same overall pressure.
 
so you gonna tell us what you do then or are you another interweb wannabee?



as for pressure it depends on a number of factors, vehicle corner weights operating speeds expected vehicle loading etc etc etc



but rule of thumb is to set them to what the original vehicle spec states, the reading will be the air pressure not the volume of air in the tyre. you can then fine tune from there depending on the above factors
 
Gaygle said:
I'm 99% sure the tyre pressures will be identical to what they used to be.

All it means is that less air will be required inside the tyre to achieve the same overall pressure.
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Why then on my Golf does it give different pressures depending on if you have 15 or 16" wheels? It does on all the cars I've had.
 
Zuma, I'm honestly curious - I know you said that you didn't post your job as it wasn't overly relevant, but why the 'cryptic' rubbish?

Presumably if your job title is irrelevant to the thread, then so are your cryptic clues and mutterings about folks being way off-base.....
 
( |-| |2 ][ $;11343606 said:
Why then on my Golf does it give different pressures depending on if you have 15 or 16" wheels? It does on all the cars I've had.
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I think it's to do with the contact patch with the ground. A think tyre with 40 psi gets more force put on it then a wide tyre with 40psi.

Larger tyre will mean a higher volume of air so more air needed to get to the set pressure.
 
I go for 35psi when hot on my bikes and cars. at the mo thats 29f 28 rear on my bike (race) and 32f 33r on my car. seems to do the trick. tyre size makes no difference due to the nature of the measurement.
 
Oakesy2001uk said:
tyre size makes no difference due to the nature of the measurement.
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Exactly. Pressure is pressure - the amount of air you put in will possibly change if you change the tyre size, but the pressure you set will be similar.
 
[TW]Fox;11346057 said:
But surely there is similar volume of air becuase although the tyre is now wider and technically larger, the size of the sidewall is greatly reduced?
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True. The difference in the volume of air would depend on what tyre you start with, and what tyre you go to. In a lot of cases, the volume probably shrinks somewhat.
 
( |-| |2 ][ $;11343606 said:
Why then on my Golf does it give different pressures depending on if you have 15 or 16" wheels? It does on all the cars I've had.
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Is the width identical on both? My guess would be no, and this will be the reason why it'll be a bit different.
 
thecremeegg said:
lol @ this thread - all he asked for was bloody tire pressures and yet everyone has a go at him....typical OCUK motors tbh, when will people get off their high horses and actually act like compassionate human beings :rolleyes:
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Quoted for the truth. And its the same person/people.
 
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