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you remove the QR from the axle. one side of the axle should face upward/to you, the hub-bearing covers are removed so that you can see your red rubber bearing covers. now hold the hubshell firmly in one hand and hit the axle with a mallet. you should see the opposite bearing coming out of the hubshell with each hit. repeat until axle with bearing falls out. remove bearing from axle, re-insert the axle in hub, remove other side bearing.
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those ultra rare big njs frames were most probably built for non-japenese riders in a keirin series. the japanese invite (or invited? i don't know if it's still a big thing nowadays) some of the best global riders for their international keirin series every year. these riders will get a bespoke frame to their specs, and every now and then someone just wants another frame, for training, or another paintjob... this looks like one of these frames, once built, never ridden, packed away...
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looks like a "normal" toothed ring to me, they tend to drop the chain when you ride them very cross-chained. most folks would use a narrow-wide chainring for 1x12 that "holds" the chain a bit better at agressive angles, bc the teeth are shaped more sophistically. I don't think your bolts will shear off.
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hey man, here ( https://velo-classic.de/oxid2/Fahrrad-oxid/Steuersaetze/Steuersatz-RENAK-IFA-verchromt-orig-alter-DDR-Bestand-auch-fuer-30-50er-J-NSU-passend.html ) is original headset, as they use different threads you need original stuff or another fork to make it work
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so here's a catalogue from 2007
https://www.campagnolo.com/media/files/035_294_Katalog_Laufr%C3%A4der_Campagnolo_2007.pdfan here from 2004 (see from page 52)
https://www.campagnolo.com/media/files/035_298_Katalog_Campagnolo_2004.pdfI can't really tell a difference, the catalogues say that later models have lighter alu freehub bodies and lighter nuts on the axle, but the hub bodies look the same.
I think the later models had the asymmetrical rear rim, but thats just a wild guess. so if your rear rim is syymetrical, means its older model. -
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yes, you could do the ds with thicker spokes and the nds with the slimmer ones, eg. d-light and laser, or other combinations, e.g. DT competition ds and DT revolution nds, but with your 80kg I think its not neccecary for a road wheelset. looks cool tho
I have a friend with 95kg and he rides cx-rays in his rear wheel with 24 spokes. so far nothing exploded -
if you can source the materials cheaper, you can build them yourself. the DT Swiss TRC 1400 track wheelset for example are about 1560 € at bike24, but the DT Swiss track hubs can be found relatively cheap. maybe ask in the orient express thread for some rated rims
https://www.lfgss.com/conversations/185341/newest/