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@veLLo
Yes chain line is fine, just have the chain ring fitted on the inside of the spider brackets, but it was already like this on my previous shimano cranks...
I did not know that these BB were less durable... Can't be worst that what I had before, that was a bad experience... I usually do all servicing on my bikes, but last october, when my old BB died, I thought I wanted to let a professionnal do it. I went into a shop that I will not reveal the name as I know people on this forum who go there... At the time this bike of mine was geared and I wanted to keep it quite vintage (I obviously changed my mind on that today...) so I asked for an old style BB, not sealed, with the good old cups etc... I took the bike back, and the same day in the evening as I was cleaning it I saw that the l.h.s. cup had been engaged at an angle!!! So depending on where the pedals were there the axle was loose or not... You can imagine how worried I was about the frame (which is from the late 50s) and the threading... The day after I went back to the shop, the guy apologized, said he would tell his mechanic how bad that was, and that he would do every thing necessary to get the thing right HIMSELF, as he was the boss, blabla... I took the bike back the same day, the cup was properly fitted this time and everything seemed to be OK, no play, etc...
I have converted that bike fixed after that and I used it almost every day since, with no trouble until this week, when it started to crack a lot, in a very dodgy way, but the funny thing was that when the chain was off, it seemed to run smoothly and there was still no play...
Anyway, because I was suspicious about the thread being damaged maybe, I wanted this time again that a professionnal would do it for me, to be on the safe side. The guy I had to deal with in decathlon was french so it was easier for me to explain all that and to tell him to be carefull when un-screwing / screwing... Everything went OK so I know now that the frame is alright!
Sorry for that long boring story...
Loic