According to the parts diagrams and lists on Bernardi (in the Chassis section)
the 2010 steel wheel is:
15X5 1/5J 42700-TK6-A01
The 2012 steel wheel is:
So I guess there is a 1/2" difference in width.
Many, including me, are using the 2012+ tire size: 185/60R15 tires on the wheels that came on the 2010-2011 Insights without issue.That tire was 175/65R15