Sorry, but the Pontiac and the S-10 tires are not interchangeable. I would think this is a Pontiac Grand Am with 225/50R16 tires and the Chevy S-10 has 205/70R15 sot he rims and/or tires will not swap.
〉 Answered on Oct 28th, 2015 by Julie Scroggins, Vice President, CFO at Waukegan Tire and Supply Company Inc.
"Short answer is yes there is too much of a difference."
Long answer is without knowing the rim diameter of each I'm going to guess
the 225/50 are 16" and the 205/70 are 15", if this is the case there is
1.44" difference in diameter which is too much of a variance but what really
makes a difference is the 205/70 is a standard performance rated tire and
most likely the 225/50 is an ultrahigh performance tire and you definitely
cannot mix these together on the same vehicle.
Hope this helps make your decision!
〉 Answered on Oct 28th, 2015 by Pat Fleischmann, Director of First Impressions at Community Tire Pros & Auto Repair