If you thought that a bike had to be jarring and unforgiving in order to be fast, we apologize in advance for bursting your bubble. The more comfortable you are, in fact, the faster you'll go. And if you need proof of this, look no further than our Ruby Expert with Ultegra Di2. Its revolutionary design erases any shadow of a doubt that smoother is indeed faster. The frame is among the lightest that we've ever made, and it's been constructed from our superlative FACT 10r carbon fiber. Its stiffness levels are also off the charts and, compared to the SL4 iteration of yesteryear, Without giving a physics lecture, we found that focusing on vertical compliance, instead of fork splay, meant that we could improve smoothness, speed, and comfort in one fell swoop. And of all the bikes that we've tested with our Rolling Efficiency Model, the new Ruby outperforms anything on the market.

51cm - seat tube, should fit a rider, 5'2"+

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