LR state the there must be no more than 5mm difference between front and rear provided the largest go on the rear. 10mm is to much of a difference. This will likely cause the VCU to be over driven which will strain the IRD and rear diff!!
 
Ok, just that Ditto said the 10mm difference was in the circumference, which would be equivalent to a 3mm diameter difference, so probably ok then :)
 

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