If you are running a flip flop hub with only one cog or freewheel here's a great little cover for the thread on the other side.
Halo Aerorage Track 700c Wheel
Halo Track Rear Hub Double Fixed/Fixed Flip Flop 24h 32h 36h 48h
Halo Track Cog Fixed Sprocket 1/8" CNC Cr-Mo. 1.37"x 24Tpi
Spawn Cycles Kotori 1 20” Children’s BMX Dirt Track Pump Track Bike Frame NEW
Princeton Track Special Rear Carbon Disc Track Wheel
Gusset Fixed Track Cog 3/32" – 1.37" x 24TPI Threaded Sprocket Fixie/SS/Track
