513f5dd6_es___UC_Cyclery___La_Jolla__CA__Drivetrain
[Level] enthusiast [Brand] Shimano [Components] Tiagra [Comments] nice function and finish, lighter [Drivetrain] 
compact double or triple chainring w/9 cogs
Buyer's Guide To Road Bicycles - UC Cyclery | La Jolla, CA
Drivetrain