You do NOT want this system for riding on the street. These are made for track racers to be able to quickly swap out the cogs. The lockring is aluminum and WILL come loose if you street ride and backpedal or skid to any great degree.
I was able to get it to work in a pinch by putting a regular steel lockring on backwards so the largest machined face was against the cog and holding it onto the hub, but it wasn’t ideal and I wouldn’t recommend anyone do that.
For less than the cost of the parts to make this work you can get a made in USA EAI cog that is very high quality and will last you forever.
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https://preview.redd.it/vhdwjpv4ok5d1.jpeg?width=790&format=pjpg&auto=webp&s=58400982f421f56412b0dd170c3b90abc14c7eed
I don’t think those are for fixed gear tho…
Found a similar looking cog on AliExpress and when asking the seller if they were compatible they sent me this image
https://preview.redd.it/29vm0002pk5d1.jpeg?width=1080&format=pjpg&auto=webp&s=58957db9af020dfb6b5e877d7f7654bbeb6dbc92
You do NOT want this system for riding on the street. These are made for track racers to be able to quickly swap out the cogs. The lockring is aluminum and WILL come loose if you street ride and backpedal or skid to any great degree.
I was able to get it to work in a pinch by putting a regular steel lockring on backwards so the largest machined face was against the cog and holding it onto the hub, but it wasn’t ideal and I wouldn’t recommend anyone do that.
For less than the cost of the parts to make this work you can get a made in USA EAI cog that is very high quality and will last you forever.
https://preview.redd.it/eq53uwxxrk5d1.png?width=705&format=png&auto=webp&s=25826807dd82431d9f4687e98ec1ea7591bc4270
This is meant to be used with a support you screw as a usual cog in your hub, and then you can change easily the ring on it.
I use the Miche as the picture, and no issues whatsoever for a street use.
EAI Deluxe/DuraAce ftw.