iwontarolla Posted July 18, 2012 Report Share Posted July 18, 2012 Hey guys, Just started to drive my ke70 and I'm alittle worried my speedos out. I'm running 14x8's with 195/55-14. I can't remember what stock is but it's Lot bigger I think. I have a random diff center and i have never figured out ratios, I know that's no help. But is it more likey it will be reading faster than I'm actually going? Thanks chris Quote Link to comment Share on other sites More sharing options...
rian Posted July 18, 2012 Report Share Posted July 18, 2012 I just did a few very rough calculations, the rolling diameter of the 195/55/r14 was a tiny bit smaller than the rolling diameter of stock wheels (I think i have 175/70/r13 on my stock wheels?) so your speedo should read a bit faster. You should do the calculations for your self to make sure, or use this program: http://www.willtheyfit.com/ Enter your new and old wheel/tyre specs and it should spit out speedo error, speed at 50km/h, speed at 100km/h etc. Quote Link to comment Share on other sites More sharing options...
19914afc Posted July 18, 2012 Report Share Posted July 18, 2012 You will need to know diff ratio before you worry about what size tyres you have. Quote Link to comment Share on other sites More sharing options...
towe001 Posted July 21, 2012 Report Share Posted July 21, 2012 Or if you have a android phone with gps then download https://play.google.com/store/apps/details?id=com.binarytoys.speedometer That way you don't have to figure out diff ratios, tires sizes and other mathematical formulas. Quote Link to comment Share on other sites More sharing options...
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