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Australia-Mx5

Original Poster:

3 posts

73 months

[news] 
Thursday 9th October 2008 quote quote all
Hi there,

I recently fitted 195/50/15 tyres to my 1990 mx5. What pressure should I be using? I have been using 32psi, and it just doesn't feel right.

GravelBen

11,209 posts

115 months

[news] 
Thursday 9th October 2008 quote quote all
How does it feel? Try lower pressure and see if it helps, if not try higher pressure and see if that helps.

Also new tyres can be a bit slippery with release compound for the first few hundred km until they scrub in properly so that could be a factor too.

skinny

3,678 posts

120 months

[news] 
Thursday 9th October 2008 quote quote all
it sounds high for normal conditions. correct tyre pressure depends on a fair few things like the type of roads you drive and how hard you drive them, the tyre itself, ambient temps etc.

try 28psi - it may feel a touch less responsive initially but will give you more sure-footedness and grip. use that as a base and go up or down from there depending on how it feels, wouldn't go much more than 2psi either way tho.

MazDave

725 posts

169 months

[news] 
Thursday 9th October 2008 quote quote all
I'd sart with 28psi cold pressure. That would probably equate to 32psi hot. That's what I run on track.

MX-5 Lazza

7,158 posts

104 months

[news] 
Thursday 9th October 2008 quote quote all
MazDave said:
I'd sart with 28psi cold pressure. That would probably equate to 32psi hot. That's what I run on track.
You don't want track pressures on the road though.
Mazda recommends 26psi regardless of tyre/wheel size. In reality it depends on how firm the tyre side-walls are. I use 26psi on Goodyear F1 but if I was using Toyo T1S/R I'd probably put it up to about 28psi.
That's hot pressures, not cold wink
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Australia-Mx5

Original Poster:

3 posts

73 months

[news] 
Thursday 9th October 2008 quote quote all
Thanks for the advice, I will try 28 and work from there.

maz8062

387 posts

100 months

[news] 
Thursday 9th October 2008 quote quote all
It depends on the tyre.

26psi is the recommended psi and should be used as your base point. If you have tyres with softer sidewalls then you can start off with a higher PSI. Toyo T1-s & T1-R are normally inflated at higher pressure for this reason.

I ride on Toyo R888 (stiffer sidewalls) and inflate them at 26 psi cold
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