In 2008, Cannondale's engineers revised the Hollowgram crank design, enlarging the core pocket, trimming weight and retaining the cranks' trademark stiffness.

At a total system weight of 580 grams, the Hollowgram Si SL and BB30 system is the lightest production crankset on the planet.

Moreover, no other production crank can claim the stiffness-to-weight ratio of Cannondale's Hollowgram.

Key points include:

• Crankarms are constructed from a 2000-series aluminum that has twice the fatigue life of 7000-series aluminum.
• Crankarms are mated to a thin-walled, hollow, oversized 30mm aluminum bottom bracket axle for superior balance of strength, weight and stiffness.
• The two-piece, hollow crankarms are CNC-machined for optimum strength and light weight.