In 25 years I have never seem this. I had customer bring in a bike complaining of a crunchy, metal grinding sound coming from the bottom bracket.
Common complain, first thought, dry cups. It was an out board bearing bottom bracket so easy peasy, pop that bad boy off and sure enough the cups where dry. Problem solved. Or so I thought.
I went to remove the inner dust cover, a hard plastic piece, but it seemed wedged in there.. When I finally got it loose this is what came out of the bottom bracket area.
This stuff was coming out of the vent hole of the seat tube. It was just pouring out of there.
I removed the seat post and used compressed air and cleared out the rest of the seat tube. Verified it was clean , reassembled the bb and problem solved.
So here is the question. I've never seen anything like this in 25 years of wrenching. The frame is from Taiwan, it's a well know bike maker (who doesn't need to be named) .
The seat tube is pierced by one area for the full suspension. Do you think this is milling that was never cleaned out? Or a disgruntled worker who dumped a handful down the seat tube?
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