As long as you can find a way to phrase it so she knows you're looking for ways to improve. That's the hard bit. Even if you're fine with the decision, letting her know you are not angry so she doesn't start from a defensive position feeling like you're attacking her decision.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"