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@retro_vélo
In my experience a lock ring is unnecessary on the track as I have never unscrewed the sprocket whilst riding on the track, but a lock ring is a must on the road(in my opinion) as I have unscrewed sprockets on descents to find the chain then gets jammed. The sprocket is effectively one of your brakes, especially if you just have a front brake caliper fitted, so the lock ring is your fail safe. If you ride without a front caliper and no lock ring on the road, then you are just taking your life in your own hands!