SVA speedo calibration.... its pasted but need to adjust it further.

Ok current tyre is 195/65 R14 and this gives indicated speed of 50mph with an actual of 40mph, its basically 10mph over the actual/true speed.

I can fix that easy with the speedo healer calculator.

I want to fit the post SVA wheels which are 205/60 R13.

So whats the total error now so i can put the correct adjustment through the speedo healer.

I am not clever enough to work it out, sure some smarty pants on here can give me the answer!


So far i have worked out
Circumference of 195/65 r14 = 1915.3mm
Circumference of 205/60 r13 = 1811.5

Diameter 195/65 r14 = 609mm
Diameter 205/60 r13 = 576mm

Thanks in advanced!

Russ



SVA past this morning!!!! woo hoo

not sure if this is right, but your new tyres have a 5% smaller circumfrence. therefore while your speedo says 50 you'll be doing 38 MPH.

EDIT: Assuming you don't fix the speedo.

[Edited on 8/7/06 by scottc]

try this