falken sn807 tyre

5portsrock · Post by **5portsrock** » Mon Nov 24, 2014 9:04 pm

Hi,
im about to have my speedo refurbed and adjusted to suit a 4.1 dif ratio.
However i need the circumferance of a 145 80 r 10 falken tyre to allow the correct settings. Thanks alot for any assistance.

Post by **ianh1968** » Mon Nov 24, 2014 11:00 pm

145x80x10

It will be about 1084 Wheel Revs Per Mile,
which translates to 1485mm circumference.

There are calculators on the internet that use the rim diameter
and profile to calculate the circumference but BEWARE!

A tyre has a flat at the bottom where it sits on the ground
so most of these values are not valid.

The figure I give here was reverse-engineered from the official
Cooper 'S' speed of 16.08mph/1000rpm on a 3.444 diff.

It should be about as close as you are likely to get...

Ian

Post by **ianh1968** » Mon Nov 24, 2014 11:07 pm

... or see this!

(Attached)

Ian

Post by **woodypup59** » Tue Nov 25, 2014 10:38 am

I can measure it for you tonight.

5portsrock · Post by **5portsrock** » Tue Nov 25, 2014 5:31 pm

ianh1968 wrote:... or see this!

(Attached)

Ian

Post by **ianh1968** » Tue Nov 25, 2014 7:03 pm

Sportsrock - Previous post? No words..., just my quote!

The .pdf shows a 145x80x10 tyre with a 1490mm circumference.
This is only 0.3% different to my 1485mm.

Ian

5portsrock · Post by **5portsrock** » Tue Nov 25, 2014 8:19 pm

Hi Ian,
Im afraid i had finger trouble.
Ment to say thanks alot for posting the info its just what i was after. Regards, Fraser

Post by **ianh1968** » Tue Nov 25, 2014 8:39 pm

You're very welcome!

Ian

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