The SI were introduced for the 2013 model years and have 3D-forged one-piece arms so they're cheaper to manufacture but a little heavier. There's been a few generations of Cdale crank arms. It offers the maximum feasible ratio of high rigidity and lowest weight. If you must have those rings and don't want high end SiSL kit, your best bet is to buy the cheaper Cannondale Si crankset complete with Spiderings from Triton Cycles at £314.99. The new Gen 3 single-sided Stages Power L meter for Cannondale Si Stages Power meter is built on to a non-drive-side Cannondale Si crank arm and is compatible with existing Cannondale Hollowgram Si crank models - 2014 or newer and Hollowgram SiSL2 cranks. Cannondale Hollowgram Si BB30 Crank Arm 172mm Right - KP305/172R. Current weights are: Si: not able to find good info, but they are standard forged like old Shimano and lower end forged crank arms, so expect heavy Hollowgram Si: 165 per arm Hollowgram SiSL2: 125 per arm In the past there was an SISL (not 2) that split the difference at 140ish. $250.00. The FSA k-lite rings fit and work perfectly, and look better. Those Spiderings are replacement rings for Cannondale's own cranksets. They will not fit normal cranksets. $249.99. The SISL2 system is much better at setting correct chain line because there is only one 2.5mm drive side spacer and all tolerances are taken up on the non-drive side of the crank. 0 bids. No, it's Ultegra 6800; BB30A, cannondale Cranks & spider - the cranks say "SI" but the crank bolts say "SISL2", FSA rings. Both bolts, Cannondale Mark IV rings, spider and bolts, BB30 spindle and spacers. or Best Offer. Cannondale Hollowgram 2021 Model Crank Arm Left 175mm CP2001U1075. Free shipping. SISL2 Road Crankset The SISL2 Crankset assembly process is different from the Hollowgram SL crankset as it is installed in a manner similar to a 2 piece crankset. Cannondale Si left crank arm, compatible and interchangeable with Cannondale SiSL2 and Hollowgram Si crank arms. I am not sure, but think the SL arms are lighter still and between the other 2 in stiffness. The Carbon arms are as stiff as DA 7800 and weigh almost as much. Cannondale’s set the benchmark again for mass production lightweight cranksets. Ask questions for compatibility and fit. Only 1 left! $100.00. $10.53 shipping. Everything you need but a bottom bracket. Each half of the crank arm is machined as a single piece, then they’re bonded together to create a hollow, extremely light crank arm. The SL arms are like the SI non-carbon arms I am fairly sure. Free shipping. cannondale hollowgram si crankset. or Best Offer. Their new SiSL2 cranksets are 100% CNC machined in a clamshell design that’s bonded together. Cannondale Hollowgram SI Crankset Includes both crank arms. The regular SI arms are 11% stiffer than DuraAce 7800 and lighter too. Works with road and mountain configurations and takes all Hollowgram spiders and SpideRings. Crank arm length: 175mm 53/39T rings. The Praxis rings just wouldn't work - they were just 0.5mm or so too far apart when fitted to the spider, so the chain kept dropping between the rings. Highs: Weight, performance and value Lows: BB30 only Cannondale’s range-topping SiSL2 has a sub-500g weight, but its prohibitive price limits its appeal. CANNONDALE crank arm Hollowgram SiSL2 | Left The Hollowgram SiSL2 crank arm is an extremely light, two-piece construction that is elaborately milled from 2000 aluminum CNC and then glued into a simple work of art. 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