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It's the kind of thing someone adds after many, many failed attempts to setup your derailleur to not drop the chain on certain shifts. I would view it as a warning about your future.
grams-
Ha!
Oh god I hope its not a bad omen. The bb area does seem remarkably clean and free of any obvious knarling, so I hope the previous owner wasn't that guy
....or maybe the dogfang thing was doing its thing and saving the day, cos its ace #marketing
user75204
Ah OK thanks a lot. So it was option a and c :)
I'm not off roading the thing, and though London's roads are not exactly billiard table I don't recall my other bikes dropping chains all over the show or even ever, so I'm guessing if you got your front derailleur set up properly, and Look didn't see the need to add one themselves, then it isn't needed and is going. And will save 18g.
Ohshit hang on, have I just become a weight weenie.....