Cats Forever
Hi jbeam,
My opinion is that all the rollers should be the same unless one is just getting by for a short time. If the rest of the tracks are new, I would make it all new and replace all the rollers.
I have a 4 roller D-4 7U and I started with replacing the two front and the two back rollers and leaving the two used middle rollers on each side. It rode like a piece of crap. I would not have believed that little difference in the middle rollers would make that much difference. I replaced all the rollers three weeks later. In my opinion, replace them all or rebuild all at the same time.
I just replace the back two or the front two when they get warn. I have not noticed any difference in the ride. If you replace the middle two in the long run you will be throwing 50% life of the rollers away. I generally replace the front or rear two and build back up the middle rollers along with the carrier roller.
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