Actually the wheels/tires in that last picture of the s10 are about the exact same OD as the stock ones. Now for what it's worth I did have some taller tires on it before but it was not really helping much because they were also considerably wider.
Still I am already planning on installing a taller rear end in the truck, hopefully in the very near future. Right now it has a 3.73 and on the highway it just screams. I don't have a tach installed but at 60 on the interstate the engine has go to be turning at least 2500rpms. But I am keeping an eye out for something higher like a 3.42 or 3.23 at the local junkyards. Also for what it's worth I really want to get a tach and some other gauges hooked up too. The truck only has a speedo and a gas gauge. I would feel a lot more comfortable with a oil pressure and a coolant temp gauge installed also.