Our premium shimano 1305bolt pattern oval chainrings are designed for pre 2014 cranks like shimano dura ace fc7900 fc7800 ultegra fc6700 shimano 105 5700 and many more these are finest shift able oval chainrings on the market if your current chainrings are 5339t this is a model you require advantages of absolute black road oval chainrings one of a kind special oval shape that helps you climb easier and faster patent pending over 15 stiffer than rotor qrings due to thicker 5m