Eccentric bottom brackets (EBB) have been used for years on single speed bikes to make the job of tensioning the chain easier than using horizontal rear dropouts. This solution allows the use of vertical dropouts in the frame and a quick release skewer to secure the rear wheel – a feature that anyone who has been miles away from home with a flat, but no wrench to remove the wheel would appreciate. With the advent of the oversized PressFit-30 (PF30) bottom bracket shell used in all types of bikes to provide a stiffer, more efficient power transfer from the pedal to the rear wheel has lead to an unexpected aftermarket part for those wanting a single speed bike – the Eccentric 46 Bottom Bracket from Problem Solvers of Bloomington, Minnesota.