PEARL IZUMI Summit Wind Jacket Men's Vest which reduces the amount of Compatio_Enriched which reduces the amount of rubber needed to fill the gaps between fibers and minimizes weight recommended for Tiagra drivetrainsChain uses a directional design with specifically shaped inner and outer plates to optimise shifting over the chainset and cassetteOuter plate design has been developed to reduce the chance of chain suckThe inner plate has been developed for better contact with gears providing smoother shifting under high load a PFAS free durable water repellent Interior stow pocket with bungy clip to store on top tube of bike