Ah, that looks messy. Is it a noname lockring? Get rid quick before you ruin your hub and get some DuraAce in there.
+1 (unless it's french as tester suggested it might be)
I have bolt on cogs on both my fixed rear wheels now and totally rate them.
My old DuraAce cog/lock ring are still solid on my mates bike tho, two years after I put them on there and they've been ridden brakeless. Worth it if you're keeping that wheel as as spare when your new one arrives.
+1 (unless it's french as tester suggested it might be)
I have bolt on cogs on both my fixed rear wheels now and totally rate them.
My old DuraAce cog/lock ring are still solid on my mates bike tho, two years after I put them on there and they've been ridden brakeless. Worth it if you're keeping that wheel as as spare when your new one arrives.