![Sturm converted to a singlespeed setup by using spacers and an 18-tooth Absolute Black narrow-wide cog. Sarah Sturm relied on a 20t wide/narrow rear cog to keep her chain secure while riding to a national championship. 2018 Cyclocross National Championships, Louisville, KY. © A. Yee / Cyclocross Magazine](https://www.cxmagazine.com/wp-content/uploads/2019/01/2018-cyclocross-nationals-sarah-strum-singlespeed-img_6308-cxmagazine-ay.jpg)
Sturm converted to a singlespeed setup by using spacers and an 18-tooth Absolute Black narrow-wide cog. Sarah Sturm relied on a 20t wide/narrow rear cog to keep her chain secure while riding to a national championship. 2018 Cyclocross National Championships, Louisville, KY. © A. Yee / Cyclocross Magazine