This crankset is the same as the original Red but it has black anodized chainrings instead of the more pedestrian grey. The SRAM Red BB30 is made specifically for frames using the BB30 system. The BB30 design consists of a 30mm thick bottom bracket spindle used on a 42mm bottom bracket shell which is different from the normal 24mm spindle and 33.9mm shell.
The SRAM red crank is stiff smooth, smooth and strong. The integrated carbon spider's design is lightweight and extremely stiff to allow for instant, efficient power transfer. Matched to the crankset is an equally revolutionary set of chainrings. They are optimized exclusively for Red components. The Red chainrings are stiffer than anything ever before for greater efficiency as well as incredible power-transfer ability.