| Go back to previous topic | | Forum name | Handling/Suspension | | Topic subject | tire size for speedo to be unaffected? | | Topic URL | https://forums.2gnt.com/dcboard.php?az=show_topic&forum=i6&topic_id=25254 |
25254, tire size for speedo to be unaffected?
Posted by thefunkpig, Sep-24-04 04:50 AM
Which tire size(s) can i get that will keep the speedometer still calibrated correctly?
|
25255, RE: tire size for speedo to be unaffected?
Posted by FlyinEsi, Sep-24-04 05:17 AM
Since you didn't give us any information, current tire size, and rim size you are going with...go here, plug in the numbers of your current size, play around with different sizes and find the best match.
http://www.miata.net/garage/tirecalc.html
Edit: I'm guessing you probably have the 205/55/16, in that case you need a 215/40/18 or 215/45/17.
|
25259, RE: tire size for speedo to be unaffected?
Posted by Steve, Sep-24-04 09:20 PM
wow it's that big of a difference in speedo reeding...jezus..I speed enough as it is..
|
25264, RE: tire size for speedo to be unaffected?
Posted by OldGuy, Sep-25-04 01:18 PM
here is a easy formula for calculating rolling tire diameter:
If you have a 235/45-17 work it like this: (section width(235) x 0.aspect ratio(0.45))x 2 divided by 25.4(this number will never change) + wheel diameter(17) = Overall Diameter.
235 x .45= 105.75... 105.75 x 2= 211.5... 211.5/25.4= 8.32
8.32 + 17= 25.32
This has been stated before but I hope this helps. Just play with numbers of tire sizes that you want after figuring your current size and you will see what works and what doesn't.
195/70-14 = 215/45-17 +/- 0.1 inch that is what I went from and to
|
25265, RE: tire size for speedo to be unaffected?
Posted by FlyinEsi, Sep-25-04 07:47 PM
Or, you can go to that website, piss on the math, and even have a fancy diagram to go with it. :)
|
25269, RE: tire size for speedo to be unaffected?
Posted by OldGuy, Sep-26-04 10:38 AM
Originally posted by FlyinEsi
Or, you can go to that website, piss on the math, and even have a fancy diagram to go with it. :)
Math is good junior! And one day you may not have access to a computer and you will need to figure it out in your head!! Then whatcha gonna do? Yeah I know, find a computer and go to the site! Sheesh! Kids! What are ya gonna dowith 'em?!?!
BBWWAAAAHHHHAAAAA :+
|
25270, RE: tire size for speedo to be unaffected?
Posted by FlyinEsi, Sep-26-04 12:59 PM
Granted, math is fine and dandy, very handy tool to have once in a while, that is why I took, and passed, every math class I could find in college. I don't see too many instances where someone is going to have an emergency and need to calculate the rolling circumfrance of their tire vs some other tire they are looking at.
Just go to the website, Junior.
:) P.S. Before your panties get into a twist, I'm just playin.
|
25271, RE: tire size for speedo to be unaffected?
Posted by OldGuy, Sep-26-04 01:41 PM
Originally posted by FlyinEsi
Just go to the website, Junior. :) P.S. Before your panties get into a twist, I'm just playin.
Junior!? Look here sonny! I was the one that taught Noah how to sail! I was a captain when Captain crunch was an Ensign! I'll give you junior! Why I'll flip you like a cheese omelet! I'll kick you like an extra point you little whipper-snapper!! :7
| |