Good deals on road cranksets at Chainreactioncycles.com
Ultegrea is fairly top end shimano at an entry level price here.
Hollowtech Design: Hollow Super Duraluminum crank arm reduces weight while increasing rigidity.
Splined Interface: 8-spline interface between BB and crank arm forms a highly rigid connection.
SGX Chainrings: Superior chain control for fast and positive shifting with a narrow 9-speed chain
Hyper Drive yes
Dual SIS yes
Chain Compatibility Super Narrow HG
Hollow Crank Arm yes
One-Key Release yes
Reinforced Spider yes
Bolt Circle Diameter 130mm
Crank Arms forged aluminum/anodized
Optional Chain Guard no