The Harley-Davidson Street Bob has gone through several transitions of late. From its debut in the Dyna series in 2006 to 2016, the only change was a bump up from a Twin Cam 96 to the Twin Cam 103 in 2014. In 2017, the Street Bob became a Softail and acquired the Milwaukee-Eight 107 powerplant. Last year, the Street Bob had the ignominious experience of being functionally identical to the back-in-the-fold Softail Standard. Stepping back out on its own, the 2021 Harley-Davidson Street Bob gets the Milwaukee-Eight 114 motor and a few differentiators from the Softail Standard. 
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