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makes more sense than requiring a female nut.
Does it though? I can see the functional advantage if the bcd is large enough and tooth count small enough that the chainring nut would be in the way. Otherwise it seems like it takes a thread that’s normally, or at least very often, in steel and replaceable and makes it both non replaceable and from a weaker material.
M_V-
Otherwise it seems like it takes a thread that’s normally, or at least very often, in steel and replaceable and makes it both non replaceable and from a weaker material.
Manufacturers don't usually specify a high strength steel for chainring nuts, but they make their tarty chainrings from 7075T6. If the steel fasteners aren't at least grade 8.8 (and they probably aren't) then the aluminium is just as strong.
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I can see the functional advantage if the bcd is large enough and tooth count small enough that the chainring nut would be in the way.
It reduces the number of small parts i.e. 1 bolt instead of male and female.
Some chainrings also comes with a shoulder/lip in place of the female bolt to assit the ring sitting in middle.
Also, some Shimano crankset are now threaded on the crank, nothing new since granny rings are mounted this way.
gbj_tester
coventry_eagle
It's just regular chainring bolts.
Quite a few narrow wide chainrings are threaded too, makes more sense than requiring a female nut.