Yeah, odd quirk of the frame - can’t get wider than 23mm on 23mm wide rims between the chainstays - that and the bottle cage bolts on the seat tube are really low... bloody good frame though!
Forgive the possibly stupid question, but do those tyres come up bang on 23mm, or are they a little wider? At least there's space for mudguards if it's chainstays only!
How come you need such slim tyres for the Parlee? Old frame and small clearance?