you're after the standard 1.29tpi lockring mate, so dura ace, surly, all city, halo, will all fit it, (i've got a novatec hub and am going to use an all city lockring, if you want further confirmation that it's 1.29tpi, here: Novatec 32 Hole Flip Flop Single Speed Fixie Hubset: Amazon.co.uk: Sports & Outdoors )
the other one you're thinking about is iso threading which is 1.32tpi, and that's like vince said: phil, miche (cheese), campag, or eai (what i've got, found at hubjub, good lockring)
@noBlakes started
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you're after the standard 1.29tpi lockring mate, so dura ace, surly, all city, halo, will all fit it, (i've got a novatec hub and am going to use an all city lockring, if you want further confirmation that it's 1.29tpi, here: Novatec 32 Hole Flip Flop Single Speed Fixie Hubset: Amazon.co.uk: Sports & Outdoors )
the other one you're thinking about is iso threading which is 1.32tpi, and that's like vince said: phil, miche (cheese), campag, or eai (what i've got, found at hubjub, good lockring)