I have the hollowgram SI mountain arms and spindle coming from a Scalpel 2017. 13 years ago, the original Cannondale HollowGram crank started the BB30 revolution and set a new standard for ultra-light, super-stiff cranks. At 35mm deep, the rims of the Hollowgram Si Wheelset sit beautifully between aerodynamic and responsive, providing the handling of shallow depth rims but still offering improved aerodynamic efficiency out on the road. Cannondale's engineers revised the Hollowgram crank design, enlarging the core pocket, trimming weight and retaining the cranks' trademark stiffness. Kit includesNon drive 7.5mmNon drive 5.5mmNon drive 2.5mmDrive side 5.6mmDrive side 2.6mmTwo bearing shieldsSee diagram for proper spacer sizes for your bike. Expect to pay a premium for the Hollowgram SL or Hollowgram SI, especially in size 170mm. Cannondale’s own Hollowgram hubs ensure smooth rolling and fast engagement. Here are some more details: In 2008. I have the bike built with mountain crankset and derrailleurs (sram x5). We haven't seen any failures yet and you can find them reasonably priced from your retailer or on Ebay as well. The SL has slightly revised arms with more material machined off from the inside, the arms are shorter after the pedal threads and there is a shaving around the arm mounting bolts. Supposedly, Cannondale did not have any problems with the three piece Carbon SI crankset. SAVE Micro-Suspension The bike has a 68mm, PF30 bottom bracket shell, as a gravel bike, this has a Road shell. You're better off buying a SRAM offering. HollowGram SiSL2 with OPI SpiderRing: The evolution of the revolution. SiSL2 and Si Cranksets. The oversized crankarms convey a sense of purpose and the 10 arm chainring design, apparently inspired by race car wheels, lends the crankset a delicate presence. CHL But it’s the lack of weight that takes your breathe away. The Cannondale SuperSix Evo Ultegra was selected for an Editor’s Choice award in 2020. The most current evolution of the HollowGram, the SiSL2 continues this tradition of radical innovation. Simply the lightest, stiffest, bad-ass-est cranks ever to be bolted onto a mountain bike, the HollowGram SiSL2 represents the latest evolution of the crank that started the BB30 revolution. Cannondale Road Hollowgram SiSL2, Hollowgram Si, and Cannondale Si crank spindle spacer set. HollowGram. My only gripe is the complete SI crankset only comes in semi compact or compact. Cannondale Hollowgram SI SL BB30 MTB Crank Arms 104 BCD 170mm Crankset PF30 You probably know that these are some of the nicest cranks in existence. These are still used on many Cannondale bikes because they offer unprecedented performance compared to the competition. Cannondale's Hollowgram Si wheelset does affect rotational mass, and the 25mm external, 19mm internal and 35mm tall carbon rims come with Stan's No Tubes rim tape. 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