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jez. as you say aaaarrrggghhhh! do you really understand tyre technology? of course the change in construction will affect the feel, performance and heat of the tyres. they are not testing just to see that they don't blow up!. last year, the belts were Kevlar. for this year, they changed to steel, and the difference was pretty drastic. the tyres were running 20o hotter, and cars that handled well on the Kevlar tyre, were not able to handle the steel. the whole carcase reacts differently. now, a compound that can cope with the higher temperatures of the steel belt, will feel different at lower temps, and the car will handle differently. so the test is to find out how the car handles with a cooler tyre. once a hybrid tyre was introduced for silverstone, merc could not cope with lower temps, leading to less grip. construction and compounds are totally interlinked, and all teams will be trying to assess where the sweet spot is with their car for the new tyre.
oh, and by the wa