BB install problem

I'm trying to build up an old Dave Lloyd TT frame and have run into bother with the BB install. When I got the frame it came with an old style spindle & cups BB, but it was no good for my chainline. So I got a 103mm Token sealed jobbie that should be just the ticket, but I've hit a snag.

The non-drive side is perfect, but when putting in the drive side (with the actual BB attached, I can screw it in until there is maybe 3mm of threads left to go and then it just stops. At first it screwed in with a light amount of resistance, getting a bit heavier toward the end and then wham, it's like hitting a wall.

I've taken it out and had a look in the shell and all I can think is that maybe the tubes of the chainstays come through the BB shell/lugs and sit a little proud of the inside of the shell and the new BB goes a little deeper than the old cups.

Does this sound right and reasonable? It would be nice to hear that it's a common occurrence before I take a Dremel and Grinder to the frame to try and get it to fit...

That's not one I've come across before. Are the bb cups on the old and new bb the same depth, i.e. the bb shell might not be threaded deeply enough for the new cups?

I had the same problem on a raleigh frame (maybe not quite as bad!) i managed to get it in, but was really really tough. Took it to Blb and they chased the threads which didnt make any difference!

Got the frame powder coated the other week and the cups screw in by hand now....

yep i had the same problem too. The threads of the new BB i bought was deeper than the old one, and it just completely stopped 3/4 the way in. Caught on something.

So chased the threads, and all was well. Sorted.

Champion, glad it's not just me then.

I've dug out the old cups and the new one definitely needs to go deeper into the shell. Trip to my lbs to see if they can get it sorted this weekend, then.

all I can think is that maybe the tubes of the chainstays come through the BB shell/lugs and sit a little proud of the inside of the shell and the new BB goes a little deeper than the old cups.

Does this sound right and reasonable? It would be nice to hear that it's a common occurrence

Yes it's common with old frames, since the BB was tapped on the assumption of a cup and cone BB with quite short threads. Your LBS will be able to chase and face it if they're any good.

Threads should always be chased before installing :)