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falken sn807 tyre
Posted: Mon Nov 24, 2014 9:04 pm
by 5portsrock
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.
Re: falken sn807 tyre
Posted: Mon Nov 24, 2014 11:00 pm
by ianh1968
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
Re: falken sn807 tyre
Posted: Mon Nov 24, 2014 11:07 pm
by ianh1968
... or see this!
(Attached)
Ian
Re: falken sn807 tyre
Posted: Tue Nov 25, 2014 10:38 am
by woodypup59
I can measure it for you tonight.
Re: falken sn807 tyre
Posted: Tue Nov 25, 2014 5:31 pm
by 5portsrock
ianh1968 wrote:... or see this!
(Attached)
Ian
Re: falken sn807 tyre
Posted: Tue Nov 25, 2014 7:03 pm
by ianh1968
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
Re: falken sn807 tyre
Posted: Tue Nov 25, 2014 8:19 pm
by 5portsrock
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
Re: falken sn807 tyre
Posted: Tue Nov 25, 2014 8:39 pm
by ianh1968
You're very welcome!
Ian