Shimano Duraace FC R9100 Inner Chainring

In order to withstand daily riding by top level cyclists, as well as the power of the Di2 front derailleur, the R9100 inner chainring is machined from hardened aluminum, then black anodized for max corrosion and wear resistance. The teeth are highly engineered following Shimano's patented shifting integration system for optimal shift efficiency, chain retention, and wear, and designed with matching precision tothe Hyperdrive tooth profiling system shared with the outer Hollowglide ring. When selecting a new inner chainring, please remember the inner and outer rings are designed as a system, so a 42T inner ring should be only be paired with the proper 54T outer ring. The other combinations are listed below.

Details

• Genuine 11-spd R9100 inner chainring for replacement or gearing change
• The 4-arm asymmetric spider design is nominally a 110bcd, but proprietary
• Small ring is anodized aluminum, and has been offset inboard to frame .4mm
• Machined aluminum with precision faces and Hyderdrive shift engineering
• Highly engineered for optimal shift efficiency, chain retention, and wear
• Inner rings are designed to match specific outer rings
• 34T (50T), 36T (50T), 39T (53T), 42T (54T)
• Options: 34, 36, 39, 42
• Made in Japan