Tyre size on D1 tdi

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Originally Posted by dullbird

that sounds about right from what i have read

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So how does that work? I have the same tyres and stuff... So which is reading correctly? GPS or Speedo?

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Originally Posted by klappers

So how does that work? I have the same tyres and stuff... So which is reading correctly? GPS or Speedo?

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Well from what I have read the speedo's generally under read by about 6/7% so if that is correct the likely hood is your gps is reading more correct.... as your speedo would be under reading. However if you have bigger than 235/70/16's on then you lose the percentage within the speedo. I'm not sire what size tyre is more acurate on the speedo you would have to ask.

This is stuff that I have read and not worked out myself so happy to stand corrected:)

i run 265x70x16 coopers muddies on standard disco 1995 only trouble i have is on full lock it rubs the control arms but thats it
and i sit 5ks under the speed as my gen rule

but been told standard tyre was the 235x70x16

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Originally Posted by Stue 3 doors down

I have a D1 pre update disco :banana:and it had 225/70/16 when I bought it but this means the speedo is out by about 5-6% so if your speedo says 100kph then you are actually doing 91-95kph roughly with out getting a calculator:wallbash:.
I have 245/70/16 BFG muds and they hit my rear guards when flexing off road and damaged the guards:eek:, the speedo is over the 100kph mark by 3kph at present but this will change whne I get new tyres. What I am told 235/70/16 is spot on with the speedo and no guards require modifactions. Keep in mind that the fuel consumption will go up:o but this is mostly due to your speedo reading.
Hope this helps

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aparently it is ...(but with my limited and not expert experiance in these matters )
...mine seems to be 7km/hout ..as in doing 100km/h ts doing 93km/h..so beats me ...

cheers

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Originally Posted by klappers

So how does that work? I have the same tyres and stuff... So which is reading correctly? GPS or Speedo?

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I HAVE 245X75 COOPERS AND NOW THE SPEEDO READS SPOT ON AND ITS BEEN CHECKED WITH 2 GPS UNITS. PRIOR TO FITTING THE BIGGER TYRES 100 KS ON THE SPEEDO WAS 93-95 ON THE GPS

Work this out, I have gone from 31" to 33" tyres and now my odo is within 1%, but my speedo is only 5% out:confused:according to GPS.

Good old LR!

JC

I noticed today that my tyres are 245/75/16 not 70s. :oops2: