what caused this?
#1
what caused this?
Intentional or wear - related?

Seller has no clue.

Seller has no clue.
__________________
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
#2
multimodal commuter
Joined: Nov 2006
Posts: 19,810
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From: NJ, NYC, LI
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
If you're asking "what's wrong with this picture?" then I have no clue. I don't see anything wrong. Wear, if any, will be on the inside races. Gimme hint?
#3
Rustbelt Rider
Joined: Oct 2008
Posts: 9,105
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From: Canton, OH
Bikes: 1990 Trek 1420 - 1978 Raleigh Professional - 1973 Schwinn Collegiate - 1974 Schwinn Suburban
I think the problem is the shape of the hole where the spindle would normally come through.
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#4
those sort of irregular scooped out areas around the spindle hole, are they factory or something someone did with a file, or caused by wear and tear?
__________________
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
#5
Senior Member
Joined: Oct 2006
Posts: 1,846
Likes: 4
From: Puyallup Washington
Bikes: Motobecane Mirage fixed gear, Nashbar Alpha Road 5000, Bianchi Grizzly, Coppi Fiorelli, , Schwinn Trike, , GT All Terra, Old Peugeot, Nishiki 3 speed, Bugatti, Cannondale Black Lightning, Dura All, Bianchi Touring, Bridgestone T700 & more
Almost looks like damage from an easy out type of thingy or maybe a reamer of some sort? It almost looks like there are ridges in there...
#6
Here is the other side:

ridges are the norm for campy NR thick cups?

ridges are the norm for campy NR thick cups?
__________________
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
#8
multimodal commuter
Joined: Nov 2006
Posts: 19,810
Likes: 597
From: NJ, NYC, LI
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
That's exactly it. The hole is, as you say, "rifled" or "threaded" so the rotation of the spindle (when pedaling forward) drives dirt and stuff out, rather than in. Look at the cup from an oblique angle and it's pretty obvious.
#9
Yes, now I think the "scoops" are just where the spiraled rifling ends around the cup. They show up in this pic too, just not as pronounced:
__________________
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
#11
I do too, now. It just looked weird at first.
__________________
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
#13
www.theheadbadge.com



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-Kurt
#15
I think that there are six parallel grooves, and the pitch of these (how much axial distance for a complete revolution) is six times the axial distance between adjacent grooves; so, they all terminate simultaneously at the exterior. The grooves may be machined so that they don't actually extend all the way to the interior face of the cup -- that would make sense for a helical “seal”: keep lubricant in, conduct crud out.
#17
well whatever, the BB is mine now.
__________________
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
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