Dear all bro's,
you shouldn't be bothered by this ....
this is because no matter what sizes your tires are ..
your speedometer will still be accurate (+- 5%)
the thing that count your speed is at the center of the tires ...
some cars might have gap but its a consistence gap ...
so its the same ...
imagine a circle ..
mark a spot 5cm from circle center ..
then you role the circle few times ..
then try to make another bigger/smaller circle ..
mark a spot 5cm from the circle center ..
then you role the circle few times also ..
the SPOT you mark is going through same speed with the other circle ..
notice that?
the circle is your tires ..
the marked spot is your speed cable from your speedometer ..
thats why when you try to run alongside with other cars its still same ...
Bro, what are you talking about?
The circumference of the wheel will affect the total revolutions per kilometer, which will in turn affect the speed reading. Refer to this:
The
RED CIRCLE shows how many times the wheel will spin in a mile (different sizes of tyres and rims) , which will surely affect the speedometer reading.
The
BLUE GREEN box shows the resulting difference in percentage (the speedo reading)
Using this example, the best upsize from a Waja standard tyre (195/55/R15) is to go to 205/40/R17 (plus 2 upsizing), but then again, its blardy uncomfortable because of the 40-series tyre.
Figures and results from :
http://www.1010tires.com/TireSizeCalculator.asp