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Teravail's new Cannonball gravel tire, listed at 38c, is actually quite close on a NoTubes Grail rim (20.3mm internal width) at 40 psi. © Cyclocross Magazine

Teravail’s new Cannonball gravel tire, listed at 38c, is actually quite close on a NoTubes Grail rim (20.3mm internal width) at 40 psi. © Cyclocross Magazine