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Cannondale’s Hollowgram SI SL cranks were already among the lightest and stiffest on the market. Now the new, US-made Hollowgram SI SL2 model pushes the weight down to just 485g with rings, spindle and arms. While the FEA analysis led engineers to shave a claimed 10-15g from the clamshell style arms — which are then bonded together — while also making them stiffer, the real gains come from the unified chainring-and-spider system the company dubbed OPI (One Piece Integration).

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“The engineers were looking at the crank arms and getting a gram here, or a couple of grams there, and a little bit of stiffness here and a little bit of stiffness there,” said Murray Washburn, Cannondale’s director of global product marketing. “And they said, ‘wait a minute, the whole spider-ring interface has so much material redundancy with all of the bolts and overlapping material.

They found that to be the next place where they could really save weight and increase stiffness.” Washburn said that the engineering team went through 17 different profiles in FEA modeling for the OPI spider before finally building samples. “Finally one of the engineers was looking at high-performance car and looking at the multi spokes there were able to distribute the loads really evenly throughout the entire structure,” he said. “So we modeled up this 10-arm system and it tested out really well.” Cannondale start with their patented method of 3D forging — which is also in use on many of their mountain bike components, including stems and Lefty suspension fork components — because, they say, it aligns the grains in the aluminum and makes for a more robust final structure.

The opi chainring set will fit any generation hollowgram crankset: the opi chainring set will fit any generation hollowgram crankset The SI SL2 model is outfitted with the OPI chainring system, which comes in both standard and compact varieties Washburn called the deflection on the one-piece forged then machined ring system, ‘non-existent.’ Cannondale have even used real estate on the back of the 10 arms that mate the two rings to machine to place additional shift ramps, which further aid in shifting. And because there are 10 arms on the OPI rings, he also said that loads are transferred more evenly than any other four- or five-arm crankset. Bootstrap Installation Procedure Pool. As a result, Washburn said that the system shifts noticeably crisper than any other chainring system on the market, save for ’s Dura-Ace. “Dura-Ace beats us by a thin margin there, but have a 100-plus gram savings over that crankset,” said Washburn.

The OPI rings will be available in standard (53/39) and compact (50/34) and in 10- and 11-speed configurations. Cannondale will use OPI on their top-tier road machines. The new one-piece ring set will also fit any generation Hollowgram crankset and cost around $150, which is reasonable when dealing in high-end replacement chainrings; i.e.

Less expensive than a single Dura-Ace outer ring.

HollowGram SiSL2 with OPI SpiderRing: The evolution of the revolution. 13 years ago, the original Cannondale HollowGram crank started the BB30 revolution and set a new standard for ultra-light, super-stiff cranks. The most current evolution of the HollowGram, the SiSL2 continues this tradition of radical innovation. These hollow cranks are created by bonding together two machined, heat-treated clamshell halves with a super-strong anaerobic bonding agent. Extensive FEA modeling and physical testing have allowed us to refine the internal and external shapes for the ultimate in stiffness-to-weight.

The results is a crank light and stiff enough for our top road race machines but still so tough, we use it on our mountain bikes as well. As beautiful as the cranks are, the most eye-catching feature of the cranks is the OPI SpiderRing. Inspired by auto racing wheels, the 10-arm spider and both chainrings are 3D forged and machined from a single block of aluminum. This one-piece design saves weight and reduces chainring deflection for crisper, more precise shifts. The SpiderRing is available in both 53/39t and 50/34t options and is retrofittable to all HollowGram cranks. HollowGram Si: Our patented OPI 3D forging process enables us to build hollow, seamless crankarms that are not only extremely light but also incredibly strong and stiff.