Tyre Circumference

[wsnaith]

Can anyone tell me what the circumference (in inches) is for a Toyo 295/35 ZR18 103 Y

Cheers

Warren

ps it's to work out the pulses for the smiths speedo

[Purple AK]

Originally Posted by wsnaith

Can anyone tell me what the circumference (in inches) is for a Toyo 295/35 ZR18 103 Y

Cheers

Warren

ps it's to work out the pulses for the smiths speedo

Nope! But if you are trying to work out the revs per mile it is 798 according to the Toyo Tech Data Book

[jemburrett]

Originally Posted by wsnaith

Can anyone tell me what the circumference (in inches) is for a Toyo 295/35 ZR18 103 Y

Cheers

Warren

ps it's to work out the pulses for the smiths speedo

60.893 inches

[kayjayd]

This website is great for working that type of thing out - http://www.miata.net/garage/tirecalc.html

[Alex Miller]

I have found that the most accurate way to work out revs per mile is to use a bit of driveway and a piece of chalk! The cals are reasonable but can be quite different as tyre pressures vary the rolling circumference more than you would think.

Mark the tire and the ground with the chalk and drive through two revolutions of the tyre, mark the ground again and measure the distance.

Divide the measurement by two and this gives you a pretty accurate measurement.

[wsnaith]

Cheers guys

[dave]

Hi Warren.
771.84 turns per mile.
X
12 gearbox pulses pre prop revolution.
X
diff ratio.

If you are using a Tremec TKO here are the settings per diff ratio.

3.58= 33158 pulses
3.54= 32787 "
3.31= 30657 "
3.07= 28435 "
2.88= 26675 "

[wsnaith]

Spot on!

Cheers Dave