If it was factory standard, then the speedo would have been calibrated by LR.
After market is the question.
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Yes mine came from factory
The LR recommended tyre sizes for the various listed 17/18/19/20" rims on the placard have the same approximate OD so no speedo differences.
I have the Nitto's in 275/55R20 on my Sport. They've done around 20000km so far and still look like new. This includes the last Perth to Fraser Island & return trip a few weeks ago. The Wilcannia to Bourke dirt road was run at night at high speed (with the camper trailer). Not a mark on the tyres, and confident handling. They performed well on the Fraser Island sand too.
Cheers
Gordon
Gordon, are they the newer TG2 carcase and pattern?
How noisy are they?