Ladies & Gents. Just need a bit of advice before I put the winter tyres on. I've found a setting in Maxidot for Winter tyres. I haven't activated it as yet as I haven't put them on but what precisely does it do? Also as my "stock" wheels are 17" Pallas ones, it has two speed boxes, +5 mph & - 5mph. Which box do I tick? So my speedo registers correctly for the 16" ones that I'm about to put on. :wonder: Ta.