well i was wondering what the actual size of the the stock 17's are to compare to what i want... but at the same time i don't know what will or won't rub... i was 19 X 8.5 with 235/30's
i don't want the speedo to change much so i know the tire is right... but will it look right with no rub?
oh yeah i'm on TRD struts shocks and springs

 

the 19s will not rub. i think a tC looks better with19s on it. my opinion tho.

 

Don't know about rubbing... but try this out for the speedometer:
http://www.1010tires.com/TireSizeCalculator.asp