Right, I'm trying to replace my Deore XT M737 crankset with a Deore XT M751 crankset that I bought on ebay. The seller said that the crankset was square taper and it's not, it's octalink, so I've been looking at new bottom brackets, but I'm utterly confused about the chainline.
At the moment I have a 28.6mm diameter M737 seatpost mount derailleur, M737 crankset and a UN72 68x107mm bottom bracket, which gives me a front chainline of 50mm or so, which seems too much already. Am I right in guessing that if I get a 68x118mm octalink bottom bracket, my chainline at the front is going to get screwed up, going above 50mm? I can't get my head around it for some reason, can anyone help me please?
At the moment I have a 28.6mm diameter M737 seatpost mount derailleur, M737 crankset and a UN72 68x107mm bottom bracket, which gives me a front chainline of 50mm or so, which seems too much already. Am I right in guessing that if I get a 68x118mm octalink bottom bracket, my chainline at the front is going to get screwed up, going above 50mm? I can't get my head around it for some reason, can anyone help me please?
