speed corrector 16inch to 18inch

[BishaiR]

Hey guys, I'm pretty sure i'll need to get the speedo fixed when i buy 2inch bigger rims for my car. Can anyone point me in the direction to get this issue fixed if it does exist when I do it.

[bennjamin]

If the overall circumference ( rolling diameter) stays the same or is very close - why bother ?

Use this handy site to work out the difference

http://www.miata.net/garage/tirecalc.html





FYI there are piggy back systems which basically alter the read out of the standard speed sensor - they basically are abit of circuit board with some diodes and resistors lol.I'm sure this can be done with a tuneable ECU too

[BishaiR]

Thanks for that, Turns out I don't think it will be different. Thanks for the help mate!
I'll be doing 0.5km/h over... not worth it