Official YARIS Wheel & Tire Guide

[eTiMaGo]

Originally Posted by Doc Zaius

(as there is a 3.41% difference in diameter from the base to the RS model!)

Funny thing, may be related or not.. My current tires are 0.8% smaller (or larger, can't remember) than stock, according to the Toyota Thailand specifications. But there is about a 5% discrepancy between my speedo and the speed reportd by my GPS unit. i.e when the speedo says I am going 100km/h, the GPS says I am going 95. Now, as far as I understand the GPS should be as accurate as can be, seeing as it calculates speed based on the actual rate of movement of the vehicle, not a wheel sensor.

What do you guys make of this?

[PetersRedYaris]

Originally Posted by eTiMaGo

Funny thing, may be related or not.. My current tires are 0.8% smaller (or larger, can't remember) than stock, according to the Toyota Thailand specifications. But there is about a 5% discrepancy between my speedo and the speed reportd by my GPS unit. i.e when the speedo says I am going 100km/h, the GPS says I am going 95. Now, as far as I understand the GPS should be as accurate as can be, seeing as it calculates speed based on the actual rate of movement of the vehicle, not a wheel sensor.

What do you guys make of this?

Your correct about the GPS being far more accurate. The thing is, with my stock tires/wheels, my speedo was 3% off. If your was the same, combine that with your .8% difference and your getting close to your 5% discrepancy.

Black Yaris- Nice thread, very helpful! I'll reference tire/wheel PM's here from now on.