SRAM Red Exogram BB30 Crankset
- Item: SRM0432 Actual Weight:"Actual Weight" means we weighed this item ourselves. 566 g
The BB30 standard is over a decade old. It's hard to believe isn't it? In 2000, Cannondale introduced this groundbreaking standard that offered a multitude of improvements over the competing 24mm standard. An oversized, 30mm spindle and larger bottom bracket shell added torsional stiffness, providing a responsive and efficient pedaling platform without increased weight. Direct fit, pressed in bearings also eliminated the need for aluminum bottom bracket cups, further reducing weight. Cannondale licensed its technology, and now a multitude of frame and component manufacturers offer BB30 compatible products like SRAM's Red Exogram BB30 Crankset.
The first generation Red crankset used a foam core with a carbon structure wrapped around it to meet SRAM's ambitions for drivetrain performance and weight. While the stiff crank arms offered excellent response under load, one complaint that came from a handful of ProTour riders was that under load the front shifts sometimes lacked sufficient precision and crispness. SRAM's team of R&D experts set out to solve this gripe and the changes you'll find on the Red Exogram Crankset directly correlate to improved shifting.
The new SRAM Red Exogram BB30 Crankset has gone away from that original foam-core formula, and now has a significantly beefier arm shape with a true hollow cross section. Because of its larger carbon-optimizing structure, SRAM is able to use less material, effectively reducing weight without negatively affecting stiffness. This also allowed them to rotate the spider to take advantage of the large, flex-fighting crank arm.
SRAM chose to stick with the 130mm bolt circle diameter standard, ensuring compatibility with aftermarket chainrings, but they've arranged the spider to position a mounting bolt on the backside of the crank arm. By integrating a mounting location within the existing carbon structure, they're able to reduce weight and deflection from shifting-- effectively enhancing the accuracy, speed, and quality of front shifts. This reduces the number of spider arms to four and gives the cranks a sleek, air-splitting profile.
The Red Exogram chainrings have also received extensive reworking to boost front shifting performance, specifically focusing on integration with the rotating, Yaw-caged Red front derailleur. Coined X Glide R, these chainrings are machined from 5mm thick 7075-T6 aluminum, but this machining isn't of the Swiss--heese, punch-holes-everywhere variety. SRAM used extensive computer-aided finite element analysis to optimize stiffness first, followed by shift ramp profiles. Then they set out to eliminate any unnecessary material without affecting the structure. SRAM placed the new shift pins to correlate with your cadence and cut the ramps to into a profile that works seamlessly with the new Red front derailleur.
The Red Exogram BB30 Crankset comes in 170, 172.5, and 175mm lengths, and both 53/39 and 50/34 chainring configurations are available.