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)
Shimano Dura-Ace 7900,7800, Ultegra 6700, Shimano 105- 5700, Tiagra 4600, FSA, Rotor 3D & 3D+, S-works and many more. Compatible with Di2
If you currently use 53/39T round chainrings you have 130BCD cranks. You are looking at correct product.
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
Optimized to each size separately. 39T- 6.5%, 53T - 10.3% ; Timing of 108.5° after TDC (top dead center). Patent Pending