Sleek balanced and consistent the tiagra 4700 series provides serious entry level riding performance with cascaded technology from dura ace features optimal balance between stiffness and light weight pedal harder and ride faster enjoy fluid shifting across various riding conditions crank construction 2 piece crank construction cassette compatibility 10 chain compatibility series color crank arm length 165 170 1725 175 chainrings 52 36t 50 34t bottom bracket bb rs500