Technical Tips > Brakes, Suspensions, Steering, Wheels & Tyres

TYRE DIAMETER AND SIZE QUESTIONS??? Re speedo calibration

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Chromie:
hi cam the formula is
63360 X axle ratio
-----------------------[divided by]
3141.6 X tyre diameter in inches
the figure you get for that is then times by 8.  This gives ya the number of teeth needed on the speedo driven gear.  
Ok Cam;53

Chromie:
Various tyres even though have the same tyre sixe actually can be quite different in height;50
I found that out the hard way;48
when I set a Corvette up with Comp T/A and then fitted yokohama
Bloody different by almost 1"
;30
i WAS NOT HAPPY JANE:20

Cameron 77C3:
Good man Chromie.  I'm just double checking the gear that I'm changing on the speedo cable.  I have Yoko's on her and they measured with the tape measure 26"

Thanks squire.  You're a legend;42

Chromie:
yOU ARE SOOOOOOO WELCOME CAM :24
sO YOU SHOUTIN THE DRINKS AT DARLING HARBOUR PERHAPS;mmm

Cameron 77C3:
Sounds fair, since you're buying lunch. :22

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