Clamp on style means you dont have to take your grip off to install the lever

-The AC-2 hubs use 20mm Angular Contact bearings with a wave spring pre-load

Though being an entry level bike it's spec'd with parts usually seen on mid to pro range level bikes

An understated

extra crank arm spacers

S&M Passero Signature Whammo V2 Frame Size:20.5" Clamp on style means youWith a shorter back end (12. 9"), taller headtube (5") and raised bottom bracket (11. 8"), the Whammo V. 2 will have you shouting Wham Bam, thank you Man! The taller headtube (ie. less spacers) translates into a cleaner setup, the shorter back end makes it more responsive and the higher bottom bracket improves sprocket clearance when grinding. The rest? Tried and true from the first Whammo. ###section### Product Specs MATERIAL: Chromoly ThermalX