I have 2011 anthem with maestro, had hd but now bbs02 (25A x 52v, enough and lighter/narrower). Just put a feeler blade in, had to clear mud (proves it to me) , fair bit less than you .015” , you’ll be sweet. Just watch chainring clearance to swinging arm, mine did kiss at one point so shimmed it (and painted the tiny mark) all good now.. 3k miles odd, some radical terrain fully loaded with saddlebags etc,
I love it