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Acker has run the Teravail Cannonball 700c x 38mm gravel tires for several years now. The treads have a tight directional center with side knobs for grip in turns. Matt Acker's Salsa Warbeard. 2018 Gravel Worlds. © Z. Schuster / Cyclocross Magazine

Acker has run the Teravail Cannonball 700c x 38mm gravel tires for several years now. The treads have a tight directional center with side knobs for grip in turns. Matt Acker’s Salsa Warbeard. 2018 Gravel Worlds. © Z. Schuster / Cyclocross Magazine