both of which are laced to single wall rims all wrapped with 2

bearing seals and all required shims

TOP TUBE LENGTH: 21

High Quality Euro BB kit

Fly Proton FC BMX Bike Collective both of which are lacedWhat set the Proton apart from the Neutron are a 100% CrMo frame, fork and bars, including Fly's fork with integrated cone shape design. One improvement that will make many people happy are the aftermarket Fuego tyres and nylon hub guards that are included this year. ###section### Product Specs FRAME MATERIAL: FULL 4130 CRMO WHEEL SIZE: 20" TOP TUBE LENGTH: 21" CHAIN STAY LENGTH: 13. 2" HEADTUBE ANGLE: 75 SEAT TUBE ANGLE: 71 FORKS: INTEGRATED CONE