speedo

[roddy]

hi what can i do to get my speedo to read the wright speed..is there a cog on the gear box that i can change or do i have to get the speeda ajusted

[Brokenshire]

Why is it reading wrong?
Oversized wheels...?

[roddy]

yes i have 13 inch wheels ..speedo is reading lower speed got a couple of tickets so its time to try and do something about it

[Brayden]

The solution would be to either fit lower profile tyres on your rims, or get the speedo recalibrated by an instrument specialist.

... Or work out how much the speedo is out by and drive accordingly.

[jono]

What profile do you have? I have 165/65's and my speedo is pretty spot on (well I was driving next to one of those Citroen's with the big digital speedo and it said 70 and so did mine )

[Brayden]

Technically 165/65/R13 tyres should put the speedo out by roughly 7%, so jono's "correct" reading must be a glitch in the Matrix.

[jono]

Technically 165/65/R13 tyres should put the speedo out by roughly 7%, so jono's "correct" reading must be a glitch in the Matrix.

Must be I'm sure my speedo is pretty spot on though. Oh well, I guess there is one way to find out

[Trevor]

My last set of wheel with 165/70/13 (got to double chek size could be 75 series) were about 15 km out.I just bought a set of pirelli p400 165/70 and did a trip to sydney with a gps and it was 5km out at all speeds, but youvé got to also allow approx 10% in accuracy on the gps as well.Also going of the km signs (check speedo signs) on the freeway every 1km my speedo only did 9/10 of a km which fitted in with the 10% .Also these tyres really gave the Mb a much smoother ride and they were only $60 each.