I heard from someone (can't remember who lol) that the silvers were made to be a control tyre for a particular race series in europe somewhere...and are a compound that was supposed to be a middle ground for both dirt and astro (I think) based tracks...so they are a bit of a compromise for both surfaces and not any competition for the traditional compounds on our UK grass/astro tracks!
I guess Schumacher have been trying to see if they could find a use for them somewhere now they can make them or have stocks, but not sure they are really much use from what little I've heard!
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