Originally Posted by
Kontact
How do you know? Shimano's wide chainring spacing makes the current mechanical indexing lose the low trim position when used an normally spaced cranks. Seen that many times.
As I recall, GRX uses a b-bracket that puts the rings further away from the b-bracket and can cause issues if you don’t use a GRX F derailer. As the OP describes this as a new bike, with a GRX F derailer, the assumption is all the components should match and he’s just having adjustment issues.