Tyre Calculator

[Daredevil]

This is useful. With this, you'll be able to tell what's the discrepancy between your speedometer and your actual speed.....if you've changed your tyres or rims recently, you have to check this out.http://www.miata.net/garage/tirecalc.html

 

[fomoco]

Kewl stuff

 

[NumberTWO]

Just to add another one here : http://www.tyremaster.com.au/fitment_tips/...tm?ct=13&pg=710

 

[SonnyCooL]

Originally posted by Daredevil@Dec 7 2004, 06:31 PM This is useful. With this, you'll be able to tell what's the discrepancy between your speedometer and your actual speed.....if you've changed your tyres or rims recently, you have to check this out.http://www.miata.net/garage/tirecalc.html
How abt those front 7.5 and rear 8.5 rims ???? How to calculate ??

 

[Daredevil]

yeah. they didn't mention about the offset though....hmmm....

 

[mini_jeff67]

Thanks for the links.

 

[mini_jeff67]

Not too sure how the tyremaster link works though... anyone can clarify? Thanks.

 

[Lee36328]

DD,

very useful link indeed.

You have just improved by top speed and 0-100 time by 2.67%, and I did not have to mod anything!

Thanks bro.

 

[fabianyee]

offset will not affect the circumferrence of the tyre. Rim width also would not affect the circumference.

I have also came up with a tyre calc using excel spreadsheet. I was a personal challenge to see how much I have forgotten my maths.hahha..

it's actually very simple. first u get the diameter of the tyre size. then from there u'll get the circumferrence and if there is a difference between the circumferrence of the stock tyre size and intended tyre size, u can get the percentage of difference.

eg
Diameter of the tyre = (sidewall height in mm x 2) + rim size(in mm)

sidewall height = tyre profile(in %) x tyre width.

So for a tyre size of 195/60/15, the calculation is as followed
side wall height = 60% x 195 = 117mm
rim size = 15inch x 25.4 = 381mm

Diameter of the tyre = (117 x 2) + 381 = 615mm

circumferrence = pi x Diameter = 22/7 x 615 = 1932.86mm

 

[Lee36328]

Originally posted by SonnyCooL+Dec 9 2004, 04:11 PM-->QUOTE (SonnyCooL @ Dec 9 2004, 04:11 PM)

 

[mini_jeff67]

Like attending an algebra class, guys! Now I have a headache!

 

[Raymond@M-BeasT]

feeling dizzy after i tried calculation...but anyway,i think that thing is useful for those who knows how to use it..

thanks for sharing...

 

[E46 2.2]

Frankly speaking im not sure what is it, but im willing to learn, need someone to explain to me. im going to put 235/35/19

sidewall OD 164 mm
rim OD 482 mm
Total 647 mm

Rolling circumference
2033 mm
203.3 cm
2.033 m

Cheers

 

[valkryie]

Check out this cool thread and calculator. Actually display the error and uses simple text box for input.

Can't seem to get the miata link to work in my pc. :dunno:

Speedometer calculator

 

[Jerman]

To share another good website for all you need to know A-Z about tyres & rims.

http://www.chris-longhurst.com/carbibles/tyre_bible.html

 

[Bailey]

good one bro jerman, i told u wat now u r more a technical person man..........

 

[Jerman]

good one bro jerman, i told u wat now u r more a technical person man..........

bang,
apa salahnya, cuma kongsi good information with the rest of the club members, ler!

http://www.chris-longhurst.com/carbibles/tyre_bible.html

 

[Bailey]

ya hidup hitler ooooopppppppsssss sorry hidup jerman

 

[kahl]

Useful Tyre Calculator

Try this out... View attachment 598

 

[syahruln]

This one is graphical, very intuitive. No need to type anything, just select from the pull down menu.

http://www.kouki.co.uk/Utilities/tyresizer.asp