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How come new nuts/bolts are necessary?
The bolts thread into the big ring for the 50+, but the 46 uses nuts. Not sure why Shimano makes them that way, maybe it just wasn't worth the complexity for the 46 since the roller pitch circle is so close to the bolt circle that a flat ring is plenty stiff enough without the fancy shaping.
gbj_tester-
Huh, interesting! The bolts in question seem annoyingly expensive (£39.99 at SJS + the cost of the chainring of course) which makes me think it's the better option to just buy a whole CX chainset, if I can find a 10 speed one (I had the RS500 in mind, but that is 11 speed, though whether that matters I don't know).
Brookly_Bay
Thanks, and thank @umop3pisdn for the cheaper option.
How come new nuts/bolts are necessary?
Will be interesting to see how 46-34, rather than the more normal (I think), 46-36 works.