The Surly New Roadie flip-flop hub features threading on both sides of the flanges to accommodate both a freewheel and a fixed cog, for the most hardcore singlespeed racers out there. The bolt-on, CroMoly axles are as indestructible as they come and can easily be replaced. The adjustable, sealed, full compliment angular-contact bearings will keep things spinning in even the worst conditions. Compatible with english thread freewheels – will not work with ACS Crossfire. 32 spokes. Available in black or silver.