42c knards got a bit close to the front mech (not a problem for you) and not a great deal of room at the stays. I reckon 40 is about it.
For everyone else's context, I am running 1X.
Have you ridden the Knards? Any good?
Knards are great tyres, although I did suffer several punctures it pretty quick succession (maybe just bad luck). Would be vastly improved if Surly made em tubeless compatible.
@GideonPARANOID started
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42c knards got a bit close to the front mech (not a problem for you) and not a great deal of room at the stays. I reckon 40 is about it.