Rolon seems to be the same as Rollmaster both made in AU using German IWIS chain. From what I learned from Cloyes and some engineers at the office. Chains do not stretch. Sprockets wear it is a result of using 2 diferent diameter sprockets that will cause ware. I'm sorta glad & dissapointed to hear that others have in-countered the same issue. My engine builder has given up on the manfacturers and has begun to install the tensioners. I want to find a solution not a band-aid, by no means busting on my engine builder he has done all he can at this point. I'm mearly trying to find a solution or better product. At this point I have ordered the .004 Rollmaster, and will have to wait and see. IMO, timing chains should be so tight to install that you think you have the wrong one. Otherwise you have wasted everything you have invested into your valve train and engine.