OK so I am know this topic has probably been beaten to death but bear with me please. I got my bike new in November and have roughly 3,600 miles and 280,000ft on it. I just now remembered to check the chain with my checker tool (.75 / 1.0). The 1.0 fits just fine in the chain so it is obviously time to replace the chain. I hope I haven't gone too far and stretched the cassette? I don't have any big rides coming up now with summer hear so I do have a small break-in period window before my next big ride (Some climbing rides in September and then White Mountain Double).
My second question is I have SRAM Red and I was wondering what would be a good chain to replace it with? Before when I had Shaimano 105 I usually got Ultegra. With Red it sounds like I should get the 1091R (these are pricy, as are Dura-Ace). Do I really need to go to these chains as they do look lighter and weaker (holes in-between links)? Can I just use an Ultegra chain or maybe a 1071 instead?
P.S.I try to keep my chain lubed and clean. I am also a big rider at 210lbs and usually do most of my riding in the mountains. Thanks.