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Discussion Starter #1
im not sure what the factory size tyres were for the 32gtr, according to gran turismo 3 they are 16 inch? what about width and depth?

need this info to find out how much my speedo is out by....... travelling at an indicated 30mph appears faster than the other traffic.....

at the moment im running standard 33gtr wheels on a 32gtr with 245/45/17-ZR rated tyres [bridgestone]. but got 2 kumho ku 15s on there way same size 245/45/17Y for the back of the car. im running in MPH, cars been converted from kmh.

if thats enough info, could someone please tell me?
 

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I guess its a bit like how longs a piece of string - if you know someone with a road angel grab it - it calculates your speed by GPS then you'll know if its over or under.

Not sure if you could then calibrate the convertor, but i guess someone will offer a proven solution
 
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