Just a quick update, I finally changed them and am now running 245/35-19 front and 275/35-19 rear Falken FK452 with no rubbing or clearance issues on the Breytons with the same 15mm spacers. The slightly thicker tyre profile looks much better with less chance of curbing the rims and they seem to fill the arches much better too and just look right. Very glad I went with this choice!
Ordered: '14 ///M50d (F15) Alpine White|Alcantara/Dakota|Piano Black|20" 468M|Black Kidneys|HK Sound|Reverse Cam|Panoramic Roof|Sun Protect|Sunblinds|Extended Store
Current: '09 ///M3 (E93) DCT|Interlagos|Novillo Palladium Silver|Black Breyton GTS|Falken F452|CF Kidneys|CF Roundels|Individual Audio|EDC|DAB|USB|TV|CA
Previous: '07 335i MS (E93) Auto|Le Mans Blue|Black Leather|CF Trim|Duke Dynamics Diffuser|CF Kidneys