Headset parts - FSA type:Cartridge Bearing (each) and we ride them hard

and we ride them hard and long

Granny gear 74 mm bcd (bolt circle diameter) x 24t or 26t or 28t

we've kept ours Sackville-simple

Then I couldn't reach the bottom four gears

They're 105mm long with a 10 degree offset

Headset parts - FSA type:Cartridge Bearing (each) and we ride them hardVarious replacement headset parts for 1" Full Speed Ahead Duron X and Orbit X headsets. Aluminum crown race 26. 4 mm crown race ID Since the crown race for the FSA Duron headset is lightweight aluminum, it is not reusable if you have to take it off (unlike steel headsets that are heavier but less prone to getting damaged if you have to take them off). So, get your replacement FSA Duron Orbit crown race here. Rubber O ring for the 1" Duron X and Orbit