Hi, I have B6 17inch alloys on my B5 (like these ones 2003 03 AUDI A4 B6 1.8 - 17 INCH 5 SPOKE GROOVED ALUMINUM ALLOY WHEEL / RIM 4F0601025AF Recycled / Used Audi Parts Online!) Currently fitted with 235/45 r17 tyres but i've been offered some 225/45 r17 tyres. Would they fit/be safe? I know the change in rolling diameter would change the speedo reading slightly which isnt a great issue, just wondering if they are even an option. TIA.