Originally Posted by
Sy Reene
You're right of course, as far as you take it. Yes, if you only own 2 tires, and both of them are the on the bike, and you're worried about finishing that 500 mile tour thru Europe that you're on because the rear is more worn than the front, then rotate them to maximize the lifespan of this finite pair of tires. Otherwise, scrap the rear tire when it's worn out and replace with a new one.
EDIT: Re-read your post. I guess I might ask though what constitutes or how do you figure out when the rotation is supposed to happen, assuming you have two tires both of which are not worn past a place where you'd want to use them (on either wheel)? I guess I'm of a mind that if I'm unsure whether a tire is prone to blowing out, on whatever wheel, then I'm not going to want to put it on either wheel.
You aren't getting it. Rotation doesn't mean rotation like on a car. When the rear is completely used up you throw it away and "rotate" the front to the rear. Then you put on a new front. You never put the rear on the front. So there is no question when to do it. You do it when the rear is used up.