Tire Pressure K11 1.3

[Taiwan]

Hello:
My name is Leon and I live in Taiwan, last month I bought a 1994 Nissan March (Micra 5 Doors) 1.3 GLA
After purchasing the car i went to get new tires and the service center installed 4 x 175/70/R13 Maxxis MA-P1 after a few days I notice the door sticker shows OE tires are 155/70/R13 and when fully loaded the car pressure should be 36psi Front and 33psi Back
I havent been able to figure out the correct tire pressure for the new tires , for the moment they have 36psi front and 33psi back , the maximum air pressure for the 175/70/R13 Maxxis MA-P1 is 36psi
Thanks for the help

 

[h701micra]

You'll be much better off at 30psi for both

 

[pollyp]

This might be useful
http://howards.hubpages.com/hub/Checking-Tire-Pressures-Aftermarket-Wheels

 

[Agent_Sm1th]

Your speedo will be reading incorrectly also with those 175 tyres on.

 

[pollyp]

Your speedo will be reading incorrectly also with those 175 tyres on.

I disagree, it's all about the tyres rolling diameter.
I'm running 195/50/15 so rolling dia = (sidewall x 2) + rim dia in mm = ((195x0.5) x 2) + 381 = 576mm dia and 1810mm circumference.
and the speedo value is spot on with the gps speed.

with 175/70/13 it's ((175 x 0.7) x 2) + 330 = 575mm dia which is near enough the same.

standard 155/70/13 tyres are 547mm dia and 1718mm circumference.

so when the wheels are both spinning at the same rpm (ie same indicated speedo readings) the standard smaller wheels only travels 95% of the bigger more accurate 195/50/15 or 175/70/13.
at indicated 60mph the stock wheels will only be actually doing 57mph (same speed that lorries cruise at in uk)