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The Crux can clear 700c x 47, or 650b x 2.1. If you need more tyre width than that, you are going to be under biked.
andyp-
You need more tyre width than that if you want more grip and speed.
The Checkmate doesn’t clear 700x47. Silly for a new gravel race bike as Lifetime Grand Prix riders are pushing tyre width to >50mm now. Not because they are underbiked (they can ride a MTB whenever they want), but because they want to go faster on an aero, lightweight, rigid drop-bar bike. Lachlan Morton won Unbound on maxed out clearances with a 2.1 front tyre. I think you’ll see the pro gravel racers choose the new Checkpoint SLR over the Checkmate, even though the latter has been designed for them. The brief changed a lot in the last 18 months.
Conti Race King 50mm has much lower rolling resistance and more grip than 45–47c gravel tyres. Plus the reduced fatigue of higher volume. That’s the way it’s going.
Anyway, apols, this should probably be in the Pro Cycling thread.
snoops
Tyre clearance