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The 10 Most Hellish Hills for America's Cyclists

Where lie the country's steepest, most muscle-shredding streets?
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Any cyclists out there want to take on what Lance Armstrong has deemed the "steepest climb I've ever seen on a bike"?

Then buy a ticket to for Hawaii and pedal to Waipio Valley Road, a short but tortuous climb of 800 feet in six-tenths of a mile. With sections slanted at a 45-degree percent grade, and access given only to cars with 4-wheel drive, just looking at the muscle-shredding lane can make rivers of sweat start to flow. As Armstrong said: "You know it's steep when the people walking down are walking backward."