Was surfin the other day and came acroos this very handy link:
http://www.miata.net/garage/tirecalc.html
It lets you work out how far your speedo will / is out if you increase / decrease wheel size. Check it out!
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yeh ihave 17's and my speedo is 12k's off.
now though its about 25k's of because i took my dash out and stuffed around with it lol.
General
Car - 1991 Vn Commodore
Wheels - 17" Roxbury Liquid Chrome / 235/45/17 Kuhmo's
Audio
Deck - Pioneer DEH-P675OMP
Splits - Alpine TypeS 170A
6x9's - Kicker K-Series K693
Subwoofer - 1x 12" Directed Audio (Xtreme) Model : 212D
Amp - 2 Channel Singer
Amp #2 - JL AUDIO - e1200 Monoblock[/COLOR]
Mods
K&n air Pod
Lukey Exhaust From Cat Back
Sc14 Super Charger!
Autoteknica Blow of valve
Speco 2" Boost guage
Video!
http://www.youtube.com/watch?v=ZYhZFnY2Vwc
my 225 60 r15 are .5kms off at 100kms![]()