There is an R in the size right before the rim diameter. -ie R15 0r R20.
A radial tire is different from a normal tire in that a radial tires athatre built to last longer. The main difference is that radial tire have wires or cords that radiate at a 90-degree angle from the tire rim.
Yes it does cuz it is equal on both sides.
I do not know what you mean by discontinued P235/70-15. Almost every tire manufacture makes all season radial tire in this size. You have multiple choices.
You can use a radial tube in a bias ply tire BUT you can not use a bias tube in a radial tire. The sidewall flex of a radial tire is greater than that of a bias ply. A bias tube cannot flex as rapidly as a radial tube and so the resulting friction or rubbing create too much heat and the tire/tube combination will blow.
15 lbs is about average for a typical 13" tire.
Radial is better.
Yes
Tire Width 185 mm Tire Aspect Ratio 65 Tire Construction Radial Tire Wheel Diameter 15 in.
if the tube is radial too
Firestone
Radial ply tires and tubeless tires are made from rubber, fabric, and steel.
That means it is a Radial tire to fit on a 14 inch rim