HollowGram SiSL2: Simply the lightest, stiffest, most incredible cranks to ever be bolted onto a mountain bike, the HollowGram SiSL2 represents the latest evolution of the crank that started the BB30 revolution. These hollow cranks are created by bonding together two machined, heat-treated clamshell halves with a super-strong anaerobic bonding agent. The result is a crank light and stiff enough for our top road race machines but tough enough for a life on the trails, as the full throttle performance of our CFR and Sho-Air Pro XC teams shows.
I had this same need today. After seeing the ridiculous price of the Cannondale removal 'tool'/bolt, I started digging through my park tool set. I found the CCP-44 crank puller and was able to successfully use it to remove my Hollowgram SL cranks. You can't use the tool as it's designed but you can unscrew the large bolt from the tool. Cannondale Mountain SiSL2 and Si Cranksets. As light as the first-generation HollowGram cranks and completely compatible with every HollowGram spider and chainring.
Since the spider is interchangeable, HollowGram cranks have many different double and single-ring chainring options, including XX1.