Once you have removed your nasty, toothy pinions, place the only one of your choice, a single speed with sharp and solid teethspecial single speed, in 14, 16, 18 teeth between the 2 aluminum spacers, tighten everything with the original clamping ring. Shimano cassette body fixie sprockets Still in freewheel mode, you will be quite relieved.
In the case of a racing frame without possible chain tension by moving the wheel backwards, a chain tensioner may be necessary.
