SHIMANO DURA-ACE FC-R9100 CRANKSET

DURA-ACE FC-R9100 CRANKSET INFORMATION

That Shimano Dura-Ace FC-R9100 Crankset is seven grams lighter than its predecessor is just the tip of the proverbial iceberg. This crankset sees changes just about everywhere.

First, one place it hasn't changed is the 24mm thru-axle spindle. This will work in not only the BB-R9100 bottom bracket in the Dura-Ace group, but all modern outboard Shimano bottom brackets.

The arms have been changed. You still have the unique Shimano bolt circle diameter that allows you to set up both compact and standard chainring combinations. But the spider arms are a bit more asymmetric than in the past to better fight the forces you legs put on them. The spider position relative to the bottom bracket has also been revised, Shimano moved it minimally toward the bottom bracket for better chain alignment (in some cases, this might limit compatibility with Dura-Ace FD-9000 front derailleurs). The large chainrings have also been designed a bit differently, a bit larger, and thus stiffer. There are several chainring combinations: 50/34, 52/36, 53/39, 54/42, and 55/42, which runs from a traditional compact to a time trial-specific setup.