I don't have a Ruby or a Six13, but I did just buy a SystemSix. Love! Not the bike you're asking about, I know; but since the geometry (in my size, anyway--48cm) and the ride quality are pretty similar to the Six13 Feminine, I thought I'd chime in. Plus, any opportunity to gush about the new ride...
In 3 years, I've gone from a steel hybrid to an aluminum-carbon Trek Pilot, to an all-carbon Orbea Orca, to the carbon-aluminum SystemSix (all that bike-buying...it's a wonder I'm still married.). I've also moved from casual solo riding at 12-15 mph to fast group rides and a little bit of racing, and my bike buying sort of follows the evolution of my riding style. The faster I wanted to go, the racier the bikes became.
I haven't ridden the SystemSix much yet...a couple short test rides, and a 50-mile club ride. So far, though, it's working really well for me. One of the issues I had with my Orca was that it creaked and flexed on sprints and climbs (mostly because of my above-average weight). The SystemSix is considerably stiffer, and I feel like more of my pedaling power is going toward forward motion. It took me a little bit to get used to the handling differences, but I now feel like I have a lot better control of the bike through corners and at higher speeds, and can accelerate and respond to surges in the pack with less effort than on the Orca.
I did worry initially about the difference in ride comfort, moving from all-carbon to carbon-aluminum. On the relatively short rides that I've done, though, I haven't noticed a significant difference. And the more efficient power transfer more than makes up for it, at least for my purposes.
I'm not sure this helps you much...the Ruby and the Six13 are both great bikes. But based on my experience with the SystemSix, if the Cannondale feels better to you already, I say roll with it.![]()



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). I've also moved from casual solo riding at 12-15 mph to fast group rides and a little bit of racing, and my bike buying sort of follows the evolution of my riding style. The faster I wanted to go, the racier the bikes became.
). The SystemSix is considerably stiffer, and I feel like more of my pedaling power is going toward forward motion. It took me a little bit to get used to the handling differences, but I now feel like I have a lot better control of the bike through corners and at higher speeds, and can accelerate and respond to surges in the pack with less effort than on the Orca.
