How do you know they are really early 1990s? I actually found mine on a 1987 factory racer Cycle Craft that seemed 100% late '80s virtually "survivor". I find mine in the reference section under 1980's, and other places I have found them have said 1980s. Everywhere I find completely no wrap it says 1990+. Lastly, you say my cranks are first version of early '90s. Lots of weld filler, then ground down smooth. Similar with the spindle bolt bosses.I believe the pieces is welded on the end, and then extension tabs top/bottom on the are bent around. I believe the pedal boss wrap around is created by extending two tabs one off the top, one off the bottom sheet, put the pedal boss in there and hammer the tabs down around it.weld across the seam and then grind smooth as if there never was a seam. That does not leave you with 3-D socket shapes on each end. Can you substantiate that? You've seen the process? I mean you have to think about how the arm gets there, and originally cranks started out as flat sheets and were folded over into a box. Secondly, you stated that the full wrap has the spline/pedal boss socket inserted into a whole in the crank arm. Or maybe there is a complete failure to really have a convention here because if his were "1/2 wrapped" then there is no such thing as "no wrap". "Half wrap" = 1 end full wrapped, the other end no wrap. You see even the infamous "flight timeline" calls them no wrap. They are are "no wrap Redline Flights 1990-1996". "yours are 1/2 wrapped at both ends." IMO, they are no wrapped. Not to pick on you, but there are several things you've said that I beg to differ on: ![]() Yours also has the 90s bb setup wereas, troys setup shows the eariler 80s bb design. your are 90s 1/2 wrap cranks but i say they also have 1/2 wrap 90s cranks. if you look closely you can see their cranks are 1/2 wrapped at the pedal boss but is full wrap at the spline boss.
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