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Ace. Saw these but from the photo they look like 32c cx tyres. Gonna be similar to the WTB horizon + gravel king slick he already has. Unfortunately on this bike if you put it on 650 x 32c tyres (durano DD/plus or almotion etc), bikes gonna be low to the ground and he already gets pedal strike as it is.
Been impressed with vittoria's 2020> MTB tyre range, their commuter tyres still fall apart from UV/salt damage after 12 months extremely reliably, but MTB + CX/GX seems good.
Vittoria Terreno Dry and Zero are available in 650x47 and are great tubeless