Tyre Size Calculation

[yoke]

Was wondering if let say my tire size is 275/30/19. Can I change to 255/40/19 or 255/45/19? Any comments from tire sifu?Another thing, what happen to the Tyre Database Price thread? Cant seem to find it

 

[tropos_net]

from 275/30/19 you can go to 255/40/19 without any change in characteristic. because the effective tire height will be the same.

 

[yoke]

from 275/30/19 you can go to 255/40/19 without any change in characteristic. because the effective tire height will be the same.

Is it the same if changing from 275/30/19 to 265/35/19 or 255/35/19

 

[astroboy]

Was wondering if let say my tire size is 275/30/19. Can I change to 255/40/19 or 255/45/19?

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

Rule of thump is stay between +/- 3% in rolling circumference. Anything exceeding that may trigger OBC alarm.

Best refer to the label on your b-pillar.