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Why?
Now got two NW chainrings that do not fit new chainring.
I guess I have to rummage around for an older chainset.
Because standards, why should you be able to buy anything with backwards compatibility? That would be far to simple.
That's the M672 - specifically for 22/30/40 rings rather than 24/32/42 (M670) or doubles M675.
The M670/675 both run 104BCD, but to allow 30T middle rings, the BCD on the M672 is smaller.
Similar options for XT and Deore.
As above, its so you can run a 30t middle ring.
Its a pita when you have no idea as they look similar and you think you can just use your old ring etc...
Blackspire and works components make a n/w ring to fit, @£30 it may be cheaper than a chainset.
Thanks - stuck an old XT on.