Serfas Scorpius 130 Tail Light Bike Accessories Brand_iSSi *Optimized lightweight crank arm design

*Optimized lightweight crank arm design produces excellent power transfer efficiency*HOLLOWTECH II*Redesigned FC for greater frame compatibility*Rider tuned gear performance through various gear combinations*Wider gear pitch increases clearance between chain and leading teeth to provide compatibility with frames with O

Compatible with any extension

heat is brought to the area of pain providing relief

Louis Garneau's patented X-Vent Ergo Air system keeps you well ventilated while their famous Biogel pads keeps your hands cozy and snug

Serfas Scorpius 130 Tail Light Bike Accessories Brand_iSSi *Optimized lightweight crank arm design