absoluteBLACK Oval 110BCD 4B 39t 2x Chainring Black

absoluteBLACK Premium Shimano 110/4 bcd compatible oval chainrings are designed for new type of Shimano cranks Dura-Ace 9100, Ultegra 8000 &; 105 R7000 only. These are finest oval chainrings on the market in terms of shifting, smoothness of pedaling and manufacturing quality. (They can be also retrofitted to 9000 and 6800 cranks). 10/11/12spd compatible. Size (Mass +/-1g): 34T (31g), 36T (37g), 38T (41g), 39T (42g), 50T (120g), 52T (137g), 53T(139g)
Colour: Black, Grey, Champagne (inner ring in black only)
Compatibility: Shimano Dura-Ace 9100, R9120, R9150 &; R9170 Di2 and Ultegra 8000, R8020, R8050 &; 8070 Di2, 105- R7000, R7020, R7070. They can also retrofit all 9000 and 6800 series cranks but use bolt covers for best appearance. 10 / 11 / 12spd compatible.
BOLTS:
o For Outer chainring please order "Long bolts" from us OR Bolt Covers
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. 34T- 6.5% ; 36T, 38T, 39T- 11.4%, 50/52/53T - 10-11.2% ; Timing of 108 -110.5 after TDC (top dead centre) - Ideal for road climbing. Patent Pending

IMPORTANT
Ramps on big rings are specially configured for combinations: 50/34, 52/36, 52/38, 53/39T
If you wish to use other configuration it will also work, but shifting will be slower and may require more "adjustments" of front derailleur to be acceptable. Also remember that front derailleur can only accept max