ben g said:
Last time i checked, underneath the body, the cars are the same

so i'm unsure what your point is?
Well they aren't the same are they ? Different brakes , different power , different shock rates , similar maybe but not the same .
My point is what works on some Zs doesn't necessarily for others & from past experience know for a fact that 19inch 8.5j et 35 rub on Si cars even with 225 35 rubber :wink: ask LankylancsLad
I also think from my own experience that E86s appear to be the least tolerant of them all , its not scientific or documented , its just gained from trying different set ups & from others trying different set ups ( Z4 Pilot & Idej jedi 2 i can think of that have had issues with their ZCs on similar widths + offsets )
If you read my first reply i haven't stated "NO" they won't fit , just that i wouldn't go 8.5j et 35 19s on a e86 Si of my own as i know for a fact that any spirited driving of any kind will result in a rub , it may not rip out the arch liner but it will catch .
You may be lucky with the use of your Se roadster , a commute down by-pass , mway or a drive into town most likely is fine but i reckon 20 mins out in the Ribble valley i could have your set up rubbing

:roll: