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Sorry, I have a 1999 Ford contour Svt i went from 16 stock to aftermarket 17, which made my speedo off, is there any to counter that?

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Easiest way is to reduce the profile of the tyres so that you wind up with the same circumference measurement. Otherwise you may be able to get different speedo drive gears in the transmission.

Posted on Apr 20, 2013

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  • wayen3000
    wayen3000 Apr 20, 2013

    i sorry can explaine that in some more detial on the part about the profile part?

  • Bill Boyd Apr 20, 2013

    Tyres come in different profiles Ie 195/95 r16---195/55 r16 and 195/25 r16 If you have a look at the side walls of the tyres you will see that the 95 profile puts the rim well clear of the road the next closer to the road and the last looks as if you have no tyres on the rims. So if you had standard 16 in rims and 95 profile ( standart speedo ratio gears) and you fitted 17' rims with 95 profile tyres then you will be going extra distance for every revolution on the wheel.By reducing the profile to the lowest distance then the circumference of the tyre means that you will be moving approx the same distance per revolution. If you are still a bit baffled have a chat with your tyure dealer and he will explain by showing what I mean on the side of the tyres.

  • wayen3000
    wayen3000 Apr 20, 2013

    ok gotcha, frod put 215/50R16 stock, i have 225/45R17 so i guess my qustion is are those nubers fare enought apart to make any chages?

  • wayen3000
    wayen3000 Apr 20, 2013

    ford sorry it 530 am no sleep hehe

  • Bill Boyd Apr 20, 2013

    I have done some rough calculations. 16 "wheels (no rubber) will cover approx 4188ft per 1000 revolutions while 17" wheels (no rubber) will cover approx 4449 ft giving you a distance of 300ft further travelled. By using the c=3.141 x dia of the overall dia of the wheels you can work out how small the dia of the 17" wheels will have to be to come close to the same max dia of the 16' wheels to cover the same distance.



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pull the instrument cluster out and check the printed circuit and connector to it from harness, plug it in and out three or four times, this may cure the problem.

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Haynes Manuals not Chiltons are the source I use for wiring. You local library might have one and photocopy it off.

Posted on Sep 16, 2009

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