And what's up with the use of a Torx T30 bolt for the chainrings now? What was wrong with a hex wrench? I had to go and get a new tool on Saturday to change the chain rings around!
771 composite middle middle rings have a slightly deeper profile that fits the "shelf" on the back of the spider.
Normal chainrings won't reach the shelf, but they fit fine with a bashguard in the big ring position.
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