aye u chould be grand ul get a bit of rubbin depending on the offset and how much weight u have in the back!
make sure the offset of ur wheels is at lowest 42 and to be perfect ET49.
30mm aint that much ive seen corsas lower on 17s so get her dropped...the shocks are some touch too!
ive koni adjustables in my corsa wi 16" speedlines on and lowered 40mm but going down another 25mm very shortly!ive absolely no rubbin even with 3 in the bak at the mo even when goin over bumps!

can someone help me i have a corsa c sxi 2003 i have fitted 17i miglia action alloy wheels with 205/40/17 toyo tyres. i have been to a garage today to see about fitting some koni shocks and some lowering springs 30mm all round but was told that because the size of my wheels they could not guarantee the tyres would not rub the archs, i then went to vauxhall to see about there lowering kit and thay did not want to know, and more or less turned me away can some body please give me some advice because i now don't know what to do.