Originally Posted by
Airburst
Sounds like it could be a seam from when the BB lug was welded together, as I believe a lot of cheaper lugs were. Maybe the BB shell was made at the same time as the rest of the BB lug, or maybe it was just a piece of seamed tubing that had the rest of the lug welded onto it, or maybe you don't even have a lugged BB joint and it's just that your BB shell is made from a short length of seamed tubing. A picture would help confirm.
I've encountered a similar issue on a bike that came with a cup-and-cone BB when converting to a cartridge one, in my case the cable guide under the BB was held in place with a rivet which protruded into the BB shell and got in the way of the BB cartridge. The manufacturer probably didn't forsee the cartridge retrofit in either of our cases, so they never designed for it.
Hi , I am delighted to say that I have filed down the lip that extended out around the cartridge BB so that it could pass through into the shell and thread in . It was the last small hurdle on what has been a tricky pug renovation . The ridge was about 1 mill high ,1 mill wide and ran the lenght of the shell , starting right after the threads ended on each side . This bike was made back in a time when there were no such things as cartridge bottom brackets and may well have been a seam of sorts .Luckily a bit of elbow grease with a file and the BB could fit . The bike runs like a dream , took it out for a spin and very happy with it
Thanks for all the help , great forums here .