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Hi,
I made the same tire transition on my 2000 D2 TD5 3 months ago (to Pirelli Scorpion AT255 70R16's, and it has resulted in a ~ 3% increase in actual speed, relative to the speedo readout (checked using GPS speedometer apps). Being a nerd, I created a spreadsheet to estimate the like change in rolling radius, and came up with a similar number (diameter increase of about 1"). I do a lot of country kms, and reckon it has made cruising at 100-110km a bit easier for all concerned.
Paul
I made the same tyre change and it appears the speedo now reads correct.
This is done by comparing with a GPS and the speed indictator signs that display your speed. Actually more than 1 of these
With all 3 being with in 1 or 2 km/hr they cant all be equally wrong can they?
That's normal.Quote:
Originally Posted by grizzz
The std tyres will give a higher speedo reading that actual(say 5% or whatever) .. and the increase in tyre diameter(eg. 235/70 to 245/75) will correct that.
So the end result is usually correcting the speedo to read more accurately.
The thign to watch for tho is the expected difference to actual difference .. which is accounted for by the actual tyres fitted.
I think Rick said, these variations could be from the same manufacturer on different batches of tyres of the same model too.
My brothers D2 has 245/75 BFG KO2s and it reads 5km/h slower on the speedo than actual now.
Whereas my D1 on it's new Chinese Hifly 245/75s' now shows 0-1km/h faster than actual .. both at 100k/h.
Attachment 148617Quote:
Originally Posted by Barkz71