How Tyre Sizes Affect Your Speedo

[Mark]

http://formula1.alloysuk.com/tyrecalc.php

Standard Tyre sizes are

S12 - 195/60/15
S13 - 195/60/15
S14 - 205/55/16
S15

[Ed]

A good one is also linked in my sig :)

[jrtuning]

are standard s13 wheels 195/55/15 ?

[alundra]

S12 195/60/15

[Ruaraidh]

They AFFECT your speedo.

The EFFECT of the change is a different indicated speed.

Affect is a verb, effect is a noun. Easy to remember "active is A"

Sorry, pet peeve!

[ShawJohn]

(Using the calcs above) - A tyre/wheel combo that makes your speedo under read by about 6% will make your speedo GPS accurate ;)

[Vova]

I like this one since it gives you a direct comparison wich is easy to overview.

[wratch]

nice one Mrak

[colchester daz]

Ive got 18's on my s13, and it came up it's 3.3% to slow so at 60mph it will read 62mph so not to bad

[m.d.]

dunno if this is any help, but ive always believed more in real life than theory,

my s13 (known for overreading spedos ive heard) with 18/225/40 wheels and tyres on the speedo reads exactly the same as my sat nav speedo, which are supposed to be very accurate when at a steady speed,

bit of a real life experience there for anyone interested

[wacomuk]

A good one is also linked in my sig :)

the link has gone what was it ?

[webrits]

Another good one here .....
http://www.miata.net/garage/tirecalc.html

[Insomniac]

Another tyre size calculator is here:
http://www.kouki.co.uk/Utilities/tyresizer.asp

[Cheekee]

Interesting

My wife has a Toyota Emina (import) that reads 60 when you are doing 70
I'm sure the wheels/tyres are way to small 195/70/15

to correct this I may need some 215/65/18s wey hey

[markgrove@gmail]

Hi guys, if your changing your wheels for a bigger size rim them i hope this link helps you decied what size tyre you need to go for. www.miata.net/garage/tirecalc.html