IRC Siren Comp Size:20 X 1 3/8 Bottom Bracket Height: 299MM

Bottom Bracket Height: 299MM

Starting off by keeping the stiffness (BB86 and oversized seat tube/downtube/bottom bracket junction)

Cycling (Road

27 B - Hub Center To Flange Center

Additionally the NB10k is IPX5 rated water resistant

IRC Siren Comp Size:20 X 1 3/8 Bottom Bracket Height: 299MMUses the same pattern as SIREN PRO. A new competition model of the SIREN series, which was developed with an aramid bead and emphasis on weight reduction. WEIGHT SIZE BEAD INFLATION IRC# 258g 20"x1. 50" Aramid 75100 295g 20"x1. 75" Aramid 75100 310g 20"x1. 90" Aramid 75100 343g 24"x1. 75" Aramid 4565 178g 20"x1 1 8" Aramid 90 259g 20"x1 3 8" Aramid 5075