hears one for 30psi

s13eater · #1 10-10-2006, 21:00

martin you seem to know your maths, so if my tyers are 4.55% bigger than the stock wheels 28mm bigger, what would the difference through gears be in mph,i can't remember what tyers i had on when i found out my clock was 6mph out.

30psi · #2 10-10-2006, 21:09

All i need to know is the tyre size

Magnum · #3 11-10-2006, 05:44

go here http://www.miata.net/garage/tirecalc.html and imput your stock tire size then the size you are using now and it will tell you the difference.

s13eater · #4 11-10-2006, 07:51

Quote:

Originally Posted by 30psi

All i need to know is the tyre size

235/45/17's martin, cheers.

30psi · #5 11-10-2006, 15:19

You will travel 4.6% faster.

Which to be honest won't make a huge difference. The speedo's over read anyway, so this will make it more accurate

Magnum · #6 12-10-2006, 07:22

When your speedo reads 60mph your actually doing 61.6mph.

30psi · #7 12-10-2006, 09:32

Quote:

Originally Posted by Magnum

When your speedo reads 60mph your actually doing 61.6mph.

No, this is wrong. For starters on a standard treaded S12 when the speedo shows 60mph, you are doing about 52-53mph.

With oversize tyres, you probably are only doing 56-57mph most.

Thats why when you try to drive per the speedo at 30mph it feels so damn slow, because its only about 25mph.