Campagnolo's Potenza offers the same race-winning shifting performance as its carbon fiber counterparts seen atop professional riders' bikes. Only slight changes in the material used in its construction differentiates Potenza. Its 4-arm spider features a unified bolt pattern to make changing between compact and standard gearing as easy as changing 8 bolts and two chainrings. This design incorporates an asymmetrically optimized bolt pattern with a spider arm that not only holds the chainring in place by way of the bolt, but also supports the chainring to increase system rigidity. And, the crank arms and spider are hollow for maximum stiffness with minimal weight.