it has nothing to do with tires. i used to have 195s on my idsi n steering wheel was as smooth as cream. now i have 185 n steering isnt nearly as gud. there are other things in the suspension which can influence the steering assist. there is a nut on the steering assembly, just below the eps motor housing, if u open it a bit, steering gets softer, close it n u make it tighter. however, if u havent gotten any work done on the suspension lately, this shudnt be the issue. i wud recommend u to take ur car to honda 3s or any other mechanic who has the equipment to reset the EPS ecu, i ve heard it helps. though never got it done on my car...