| Author | Topic |
|---|
Location:
brisbane
Registered:
October 2004
|
|
Re: Bigger wheels, will they effect speed reading? how to adjust the speedo
|
Tue, 31 May 2005 01:25
 
|
 |
there are laws to the rolling cirumference for a reason, so it doesnt affect your acceleration/speed and the speed readings - eg qld is 10% difference in wheel diameter, and also so the bigger wheels dont foul the wheel arches and suspension!
therefore you may have larger rims with lower profile tyres to maintain the same diameter within 10%.
to go to the next rim size (+ 1 inch) you must have a step down in the profile (-15 or so),
or + 2 inch up = -30 in tyre profile etc, these are called plus 1, plus 2 plus 3 fitaments.
the other option is to correct the speedo system, 3 options :
correct the speedo, older cable ones use a magnet and can be calibrated.
newer cable ones that cant be calibrated you would use a mechanical speedo correcter, its a ratio box about $120
newer electronic ones, you use a digital speedo correcter, about $130 or $60 for a jaycar kit.
but dont band aid the problem if you can avoid it, instead of changing the diff / correcting the speedo, you are still running a bigger wheel which affects the car, fix that problem and you wont have the rest of the problems - ie lower profile tyres, cheaper now because the have become common.
good luck
[Updated on: Tue, 31 May 2005 01:26]
|
|
|
