Here's my fixie conversion. I'm using a Surly track sprocket (19T x 3/32") and lockring, with a Halo AeroRage rear wheel. Replaced the BB with a 110mm Shimano BB-UN55. I'm using the original 52T outer chainring and the 3/32 SRAM chain that was on the bike when I bought it as a 10 speed, years ago. Decathlon 23.4m seat post.
Here's my fixie conversion. I'm using a Surly track sprocket (19T x 3/32") and lockring, with a Halo AeroRage rear wheel. Replaced the BB with a 110mm Shimano BB-UN55. I'm using the original 52T outer chainring and the 3/32 SRAM chain that was on the bike when I bought it as a 10 speed, years ago. Decathlon 23.4m seat post.