The link below takes you to a posting over on RangeRovers.net's RRSport section where there is a Sport with bigger wheels on the rear than on the front.
Excuse my ignorance, but maybe somebody can tell me whether there will be transmission wind-up with this set-up due to the different rotation speeds of the wheels?
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The thread goes onto say that as long as there's less than a 4% difference in rolling circumference it's OK. I'm not so sure - 4% seems a mighty arbitrary figure... I'd like to see anyone convince LR to replace a broken transmission under warranty with that setup... 

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The difference in rolling radius of front back works out at 1.35%. That really is not going to damage anything. The main size difference in this set-up is the width not the height(rolling radius). 2013 New Range Rover Sport HSE SDV6
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2006 Toyota Vigo Truck 3.0D4D.