Possibly a stupid question; but if you're running 650b x 42 in a 700c frame (like me) it's 650b mudguards you want?
You can actually run 700c mudguard with 650b wheels as well, but a 650b mudguard would wrap the tyres more effectively.
@jambon started
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Possibly a stupid question; but if you're running 650b x 42 in a 700c frame (like me) it's 650b mudguards you want?