tire sizing and recalibrating speedometer.

[Beau]

what size tires can i run on an 18 x 9 rim without having to recalibrate the speedo? is this even possible?

scenario: I'd like to run the FR500's (18 x 9) as my regular rims and then put 17 x 10.5's on with DR's for the track. so what size tires am I limited to for the 18's?



If it matters I have a 2003 GT 5 speed.

 

[Beau]

teh bump

 

[Beau]

bump again.

 

[cynicalcriminal]

bump again.

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

Toss some numbers into that ... it'll let you know flat out how "off" your speedo will be

 

[Beau]

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

Toss some numbers into that ... it'll let you know flat out how "off" your speedo will be

thanks