I have an internal bearing bottom bracket for my VP Free. The BB threads all appear fine, and this condition may be normal.
First I screwed in the non-drive side of the BB (containing the shaft and bearings) and it went perfectly smoothly. The threads were coated in anti-sieze and the rest of it covered in lubricant.
I proceeded to install the other side of the BB, a retaining cup and thoroughly lubed the inside of it. It threaded in a good 3/8" smoothly, then it became stiff. Not too stiff because it still went in smoothly, it just took more effort for the remainder of the installation.
I ended up having to take it off because of a chainguide issue, so I looked at it closely. The grease was cleaned off the inside of the cup about halfway down it up to about 3/8" from the end.
This might be normal. I'm assuming the BB cup is simply sliding around the other half to create a very close fit, but please correct me if I'm wrong.
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