Alloy 1-1/8" CSU Assy, 12 Reba/SID-B DualAir 29" NLS

- Tapered steerers (when offered) are designated by 1.5>1-1/8" spec info\n- Replacement CSU (crown/steerer/upper) units and BoXXer crowns\n- BoXXer top crown sizing reference (head tube+headset): short (3/4" drop): under 160mm/tall (2" drop): 160-190mm