These Premium Shimano 110/4 bcd compatible oval chainrings are designed for Shimano cranks like Dura-Ace 9000, Ultegra 6800, 105- 5800 and others. These are finest oval chainrings on the market in terms of shifting, smoothness of pedaling and manufacturing quality. Not compatible with FSA cranks.
34T (31g) 36T (37g) 38T (41g) 50T (120g) 52T (137g) Compatibility: Shimano Dura-Ace 9000, Ultegra 6800, Shimano 105 5800, Tiagra 4700. Compatible with Di2 & Pioneer, SRM and other power meters
Material: CNC machined 7075 Txxx Aluminum. Long-lasting construction.
Mounting: 110 BCD x 4
Bolts: For Outer chainring please order Long bolts OR Bolt Covers. Changing Inner chainring to oval only? Simply use original bolts.
Ovality: Optimized to each size separately. 34T- 6.5% ; 36T- 11.4%, 38T- 11.4%, 50/52 - 10.3% ; Timing of 108 -109.5° after TDC (top dead center) - Ideal for road climbing. Patent Pending.