Subrosa Sono BMX BikeThe Subrosa Sono closes a gap between the Subrosa Altus and the Subrosa Tiro in terms of price, performance and equipment. Built with a 1020 hi ten construction across the frame, fork and bars for strength and durability with a heavy duty chromoly 3 piece crank. To get the Sono feeling as smooth as possible Subrosa used Rant's loose ball front hub and semi sealed cassette rear hub, with Rant's Squad rims front and rear and their matching Squad tyres