At the beginning of this week I changed out all 4 tires from Blizzaks to Goodyear Assurance P245 / 65R17. The local mom and pop shop here had a deal on them so I made a snap decision to get them. I needed tires ASAP due to the fronts having lost most of their trend and cracks on the sidewalls. Manufacturer recommended size is P245/70R16. Is this okay that they are 5% lower in aspect ratio? The front 2 tires seem to "sag" or bulge out near the bottom. My previous tires did the same and being a dumbass I never thought to lookup the exact specs from the manufacturer before buying. Should I try and exchange them? What do you guys think?