Bit of advice please?. My 2018 SQ5 has the 21'' polygon alloys with the Pirelli tyres fitted done 5ooo mile in perfect condition. I really like the other 21" alloys the twin spoke v design ones & have been offered a set which I think I'm going to have. My question is I've no idea what the polygon ones are worth or what to ask? Any advice appreciated please or if any body fancy's a set let me know with an offer.