tyre size calculater

[john the horse]

Right here i go trying to be logical without checking first so heres the deal

Theres a certain tyre i am after which is 205/60/15

Now im running 185 65 15

WITHout worrting bout width and clearance , i got that covered, my question is about rolling radius so heres my calc based on common sense without looking into it and so am i right or wrong


185 divide by 100 equals 1.85 then multiply by 65 gives me 120.25
and
205 divide by 100 equals 2.05 then multiply by 60 gives me 123

And so this means that my rolling radius is the same/ a tad bigger with the 205s


Am i correct?

jth

 

[67westy]

Looks right to me!

 

[john the horse]

Luxury i been looking for these certain tyres for ages. thanks

jth

 

[Trikky2]

6mm larger - close enough as makes no difference

 

[67westy]

6mm larger - close enough as makes no difference

Wouldn't 6mm be the diameter rather than the radius?

 

[aspro]

Wheel calculator says the difference in Rolling circumference is minimal just as you've calculated. 0.89% bigger to be exact.

Chuck your figures in here to work it out. http://www.brspecialtuning.co.uk/Tyre%20size%20calculator.htm" onclick="window.open(this.href);return false;

I get about 3mm larger in circumference.

Edit: Sorry should have read radius.

 

[Trikky2]

6mm larger - close enough as makes no difference

Wouldn't 6mm be the diameter rather than the radius?

Yes

 

[john the horse]

Cheers guys so thats actually 18.8mm extra on circumferene then using pi so that mens ill be ever so slightly taller geared, good.

thanks again ebay here i come.


john

 

[aspro]

About 97mm bigger circ.

 

[Doug1981]

according to http://www.kouki.co.uk/utilities/visual-tyre-size-calculator

you will be increasing the radius from 195.25cm to 196.98cm