R Rampage Retrobike Rider Feedback View Sep 26, 2015 #1 Don't think they are BMX as they don't have the freewheel. The inside of the cog is threaded.
Osella Senior Retro Guru Sep 26, 2015 #2 Re: Looks like it could be a spacer, single-speed gear and lockring for a screw-on freewheel hub.
one-eyed_jim Old School Grand Master Sep 26, 2015 #3 It's hard to judge the diameters from your picture, but probably a track sprocket and lockring, plus a (freewheel / bottom bracket / Sturmey Archer) spacer. Is the lockring left-hand threaded?
It's hard to judge the diameters from your picture, but probably a track sprocket and lockring, plus a (freewheel / bottom bracket / Sturmey Archer) spacer. Is the lockring left-hand threaded?
R Rampage Retrobike Rider Feedback View Sep 26, 2015 #4 Didn't think of track! Yes, left hand thread. Thanks.