Vehicle & Technical > Discovery

Speedo error

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ne jones:
thanks for the replys.

L know that borrowing a gps on the 235/70x16 tyres the speedo is just 2 mph slow.

Using the table above there is a difference in size of tyres of 9.77%

Would that make the speedo that amount faster or slower?

Budgie:
It should (IIRC) make it read slow as you have a larger distance to travel per rev of the wheel.
If you go for 235/85's then you can bring the speedo back to near normal by fitting a speedo drive gear from a 110 to the Disco or if you phone Ashcrofts and tell them the vehicle, transfer box ratio and tyre size then they should be able to supply you with the correct drive gear.  :wink:

JimsMowing:

--- Quote from: "thermidorthelobster" ---On the Disco II, 235/85s are exactly 10% larger than the standard tyres, as are 265/75s for that matter.  But I can't remember what the standard tyres are on a Disco I.
--- End quote ---


235-75-16

gimpy:
I have a D2 and run 255/55 18's with AT2 on for general running around and then chang to 235/85 16 with insa sahara on and the difference is 5 mph fasterwith std ratios. this was confirmed by the tom tom.

ChrisW:

--- Quote from: "JimsMowing" ---
--- Quote from: "thermidorthelobster" ---On the Disco II, 235/85s are exactly 10% larger than the standard tyres, as are 265/75s for that matter.  But I can't remember what the standard tyres are on a Disco I.
--- End quote ---


235-75-16
--- End quote ---


 :oops: 235-70-R16 or 205/80's  :wink:

It is about 10% slower, with 235/85/R16's on mine, doing 65 on the speedo is about 72 on the gps but as with all things LR YMMV!

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