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changing wheels!

chris-OH!

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hey guys i never knew this before but apprently putting larger sized wheels on your car can throw your speedo out...

can anyone explain this to me and if so does that mean the odo is wrong also?

this has blown my mind is there anyway to fix it? haha
 

Adamvr93

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this is beacause the cirumference of the larger wheel will be bigger which means that with one turn of the wheel the car moves further than it would with the standard wheels... for example say the circumference of your standard wheels was 1 metre and the circumference of the bigger wheels is 1.1 metres then with 100 turns of the wheels the car will move 100 metres with the standard wheel but it will move 110 metres with the bigger wheel... i hope that makes sense to you i'm not too good at explaining things lol
it will only be out about 5 k's or so... so not much to worry about
 

VY.abercrombie

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what has to be done to fix this up ?
 

VY_utester

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take it to your holden dealer or gearbox specialist. They sould b able to hook u up nice n easy, shouldnt cost the world either. As was said a small change in speed wont matter, aslong as u keep ur eye on the cops n remeber ur going a tad faster than what ur speedo reads.

But also note that with a small rim u have a larger tyrewall, and with a larger rim u usualy run low profile tyres, so the actual distance between the center of the rim and the outer edge of the tyre may be the small or only slightly over. Get the calculator out if u know what rim and tyre sizes u run now and what u plan to run
 
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