original tyre sizes

[Luke]

hi all,

i am looking at replacing my wheels. my tyre placard says just 175 r14, it doesn't have the aspect. what was the original tyre size for a 72 240z? i have a set of 15's to put on but want to get the rubber right.

fyi http://www.toyo.co.uk/converter/converter.html is a great tool for plus-sizing

cheers,

luke

[laffeaux]

In the US the stock size for '71 is "175 H R-14." I'm not sure if the UK used the same size, or if you guys ever had the crazy system for giving tire size. I have my original spare and it's this size - an "H" is about a 70 or 75 in modern aspect ratio.

[Ed]

Are you sure you want to put the original tire's on there? (skinny little buggers) The car looks SOO much better with some meat holding it on the ground.

[SFMRZ]

I've talk to Michelin and they said that the original tire size for the 240Z was 175 - 80 - 14 which is about a 25" tire. 195 - 70 - 14 or 225 - 60 - 14 would have about the same diameter.

[Luke]

thanks guys & yes i am planning to put fatter tyres on ;-) i just needed to know the original overall dia. so i could get the right profile for my 15x7's. apparently it is very important to maintain correct overal dia for correct susp. geometry?

[1 tuff z]

the correct plus one conversion is; 205/60/15