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. 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, 5mm construction Bespoke Absolute Black 6 point ramp and recess shifting design shifts better than any other brand and model of oval chainring Finest design that provides excellent strength to weight ratio You will not feel the oval shape while pedaling Your pedaling action will feel smoother Helps reduce stress on knees and helping your legs remain fresher for longer You will be able to maintain better cadence while climbing Reduces possibility of leg cramps You will reduce chainring/cog shifts by at least 15% Shifting quality and technology Both, inner and outer oval chainrings are optimized with smooth shifting in mind. This is why the back of the Absolute Black Oval road chainring does not feature cutouts, like other oval products on the market. Instead, we design smooth angled surfaces, to help chain to slide quickly and precisely between chainrings. Absolute Black outer oval chainrings have 6 up-shifting ramps, for easy and quick gear change, even under load. Each outer chainring also features 12 down-shifting points. Instead of steel shifting pins we use a CNC machined ramp and recess solution. Special raised ramps work in conjunction with the tooth recesses to stabilize the chain when shifting. Our oval chainrings DO NOT require any modification to the (standard) front dérailleur in order to work properly. Why our oval chainrings work Our premium Oval chainrings work because riders do not produce power evenly through a pedal stroke –the musculature of human legs makes it difficult to maintain an even power delivery to a round chainring. Believe it (or not), but a round chainring doesn't transfer torque to your rear wheel as smoothly as an Oval one. Oval rings work with the natural human physiology. Oval chainrings maximize the part of the stroke where power is produced and minimize resistance where it isn't. As a direct consequence, Oval rings enhance a cyclist’s ability to spin with a smoother power delivery and feel easier on legs while climbing. You will actually feel your pedal stroke to be more round with an Oval chainring than with a round chainring. Why our Oval chainrings do not have adjustable timing At Absolute Black we have extensively studied the relevant performance data regarding the optimum percentage of ovality, shape and, critically, the timing of the oval – the positioning of the high and low points of the oval, in relation to the position of the crank arm and focus this into one single mounting position – this is the really important part of what makes Absolute Black Oval chainrings so effective. By simplifying our oval chainring design, to reflect a single high performance ‘sweet-spot’, we are able to make the process of fitting Absolute Black oval chainrings faster and easier, as well as making our rings even lighter. Specification: 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

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