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The radically shaped chainstays. A top tube so flat it’s nearly invisible from the side. You can tell simply by looking that the 566 is designed with one thing in mind: vertical compliance. Out on the road, those tubes acted like leaf springs, taming confidence- and energy-sapping road buzz. As with other bikes in this category, the SRAM Rivalequipped 566 uses a taller head tube and longer wheelbase for a more comfortable and stable ride. Unlike many of them, it doesn’t feel the least bit sluggish. “They didn’t sacrifice much to make it comfortable,” said one tester after a mountainous ride north of Tucson. $2,699; 18.0 lbs (56cm);
