Vehicle & Technical > Discovery

speedo's wrong now!!

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Sooty:
Most speedometers read about 10% under to allow the manufacturers to fit any speedo to any car without having to calabrate every one off the line to avoid one reading 30MPH at 33MPH and maybe being prosecuted for somebody being done for speeding.
I have 235/75 fitted to my 110 and the speedo is now spot on, all my company cars (unmodified) read 10% under.
As Paul says, check it against a GPS, you may be suprised.

hobbit:
My 235/75s are the same, my speedo is reading down 2/3 mph, according to the gps, my fathers zafira is worse, 5/6 mph down at 70

The disco at that 2/3 I can live with, least you can sit on the needle and know you are within the limit

thermidorthelobster:
When I went from 235/70s to 235/85s (the same diameter as 265/75s), the speedo went from reading about 7% under to 3% over.  I can live with the 3%.  At 40mph it's pretty accurate, it's around 70 you have to be aware of the couple of mph difference.

scorpio:
I put 235/85's on mine and it made the speedo read spot on.

turtle:
Put 265/75R16 on my defener and its put the speedo right out, gald I have the GPS to keep me in line  :D

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