Mechwarrior 4 Vengeance Isotopes. Categories Cranks SI Hollowgram Crank Chainrings spider. Forged OPI chainrings for all Cannondale SI Hollowgram cranks. Lockring SI SL.

’s highly innovative Si Hollowgram chainset has been around for years, but has mainly been available only on Cannondale’s own top-level bikes with very little aftermarket availability. Now thanks to the cycling industry’s widespread adoption of BB30 – another Cannondale innovation – the American company is making the design available to all. Cannondale’s range-topping has a sub-500g weight, but its prohibitive price limits its appeal.

This new Si model forgoes the SiSL2’s CNC clamshell construction in favour of a patented 3D forging process, which allows it be lighter than the previous Si chainset without compromising its stiffness. Driver Door Module Volvo S80 there. It comes as a complete package with a pair of FSA chainrings (50/34) and a BB30 bottom bracket. It’s pleasingly simple to install too, requiring a single 10mm Allen key, with all the spacers laser etched to show which side they go – so fitting’s a doddle even without the instructions. The chainset’s low mass – just 611g – is matched by admirable stiffness, while the quality bearings ensure that it turns smoothly. The FSA rings are the same CNC machined units you’ll find on the last generation K-Force Light – before it adopted its new integrated four-arm system – and the tooth and ramp profiles offer fast, accurate shifting even under load.

If you are looking to upgrade your chainset, this is a cheaper option than either the SiSL2 or FSA’s K-Force, and it’s 25g lighter and costs 50 quid less than ’s excellent Dura-Ace chainset – or even more once you factor in a bottom bracket. You can also upgrade the Si’s rings once they’ve worn out with Cannondale’s Spridering, which would shed even more weight. True, not everyone will want a chainset bearing the Cannondale name, but then you would be missing out on a technically brilliant chainset purely for the sake of a laser-etched logo, which would be a great shame. This article was originally published in magazine, available on and.