Our Premium Shimano 130/5(bolt 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 53/39T this is a model you require. Size (Mass +/-1g): 39T (34g), 53T (110g) Color Black Compatibility Shimano Dura-Ace 7900,7800, Ultegra 6700, Shimano 105- 5700, Tiagra 4600, FSA, Rotor 3D & 3D+, S-works and many more. Compatible with Di2 Important If you currently use 53/39T round chainrings you have 130BCD cranks. You are looking at correct product. BOLTS For Outer chainring please order Long bolts Changing Inner chainring to oval only? use original bolts Material & Finish cnc machined 7075 Txxx Aluminum. Long-lasting construction, type II anodizing Ovality Optimized to each size separately. 39T- 6.5%, 53T - 10.3% ; Timing of 108.5° after TDC (top dead center). Patent Pending
