Trek Tyro Child Bike Helmet 48-52cm push Drivetrain Rear Derailleur: Shimano Tourney

Drivetrain Rear Derailleur: Shimano Tourney 7S

BB/Spindle Interface: SRAM DUB

but in a pared-down

Marlin Gen 3 gives you serious trail capability

shaped to perfectly balance aerodynamic efficiency

Trek Tyro Child Bike Helmet 48-52cm push Drivetrain Rear Derailleur: Shimano TourneyReady to ride with the grown ups The Trek Tyro is a dedicated youth helmet packed with the same performance and comfort found in adult helmets. A Fidlock magnetic buckle lets kids secure the chin strap easily, and an simple to adjust dial fits a wide range of head sizes. Plush pads make the helmet comfortable for a full day on the bike. Product details In molded EPS shell with additional rear coverage for protection and durability Fidlock magnetic