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Got A Stumper.

rideit

rideit

Bob the Builder
Aug 24, 2004
23,309
11,487
In the cleavage of the Tetons
So, I owned a shop for ten years, and worked as a wrench for 20. I have worked on thousands of bikes...I have a brand new Cassette, Chain, and chainrings (9 speed, 11-32). Skips like a son of a bitch in ONLY the 11 tooth cog.
Try it Nao has been...tried.
Derailleur bscrew is perfect, spring is good (was working perfectly with the worn out cassette and chain).
Anyone?
CX bike.
 
Jm_

Jm_

sled dog's bollocks
Jan 14, 2002
18,978
9,638
AK
How's the actual b-tension spring? Possible something in the derailleur fractured/broke when you changed it (because it was already on it's way to breaking)? I remember those old SRAM b-tension rings would break.
 
4130biker

4130biker

PM me about Tantrum Cycles!
May 24, 2007
3,884
449
Is the upper derailleur pulley parallel to the cogs (eyeballing it from the back)? Maybe a tweaked derailleur hanger with nice new teeth is catching where the worn setup didn’t.
 
rideit

rideit

Bob the Builder
Aug 24, 2004
23,309
11,487
In the cleavage of the Tetons
Correct chain, new cassette, new chainrings. No stiff link, only skips in the 11, no bent cogs.
It skips over the cogs like a new chain on a worn cassette or vice-versa.
There are no spacers.
Looks flexy
 
OGRipper

OGRipper

back alley ripper
Feb 3, 2004
10,650
1,121
NORCAL is the hizzle
What brand(s) are we talking about?

Process of elimination: Try a different 11 tooth cog from a different cassette, even an old one. The skipper could have been dropped or crushed or something.

If that doesn't work sounds like a chainline/spacing issue of some kind. What frame, crank, BB, and hub? Spacing all kosher?
 
rideit

rideit

Bob the Builder
Aug 24, 2004
23,309
11,487
In the cleavage of the Tetons
Everything has worked flawlessly on this rig for around 20 years, no spacing issues.
Ultegra 9 triple, chain line is perfect. XT derailleur.
It was doing the same thing when I tried a new chain on the old cassette, (only in the smallest cog) so *maybe* the derailleur, but it works PERFECTLY with the old chain and old cassette, which would be odd...
 
Jm_

Jm_

sled dog's bollocks
Jan 14, 2002
18,978
9,638
AK
rideit said:
Everything has worked flawlessly on this rig for around 20 years, no spacing issues.
Ultegra 9 triple, chain line is perfect. XT derailleur.
It was doing the same thing when I tried a new chain on the old cassette, (only in the smallest cog) so *maybe* the derailleur, but it works PERFECTLY with the old chain and old cassette, which would be odd...
Click to expand...
If it's the derailleur, what do I win?
 
OGRipper

OGRipper

back alley ripper
Feb 3, 2004
10,650
1,121
NORCAL is the hizzle
rideit said:
Everything has worked flawlessly on this rig for around 20 years, no spacing issues.
Ultegra 9 triple, chain line is perfect. XT derailleur.
It was doing the same thing when I tried a new chain on the old cassette, (only in the smallest cog) so *maybe* the derailleur, but it works PERFECTLY with the old chain and old cassette, which would be odd...
Click to expand...
Smells like there is something just off enough to show up with a new chain, but that didn't show up with the extra slop of your old chain.

How old is the derailleur? Pulleys ok?

Wait, it's a triple? You better ask Lennard Zinn. :banana:
 
Jm_

Jm_

sled dog's bollocks
Jan 14, 2002
18,978
9,638
AK
rockofullr said:
Good luck. I did the bike shop scavenger hunt for a 9spd a few months ago. Took quite a bit of calling.



I need to refresh threads before commenting :busted:
Click to expand...
Ya'll don't have bike swaps on your part of the flat Earth?

Cheap 10 and 9spd stuff (for my commuting drivetrain) forever!
 
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