absoluteBLACK 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)
. Colour: 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:
o For Outer chainring please order Long bolts
o Changing Inner chainring to oval only? use original bolts
. Material & Finish: cnc machined 7075 Txxx Aluminium. 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 centre). Patent Pending
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 pedalling
. Your pedalling 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%
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