This may not be your problem, but I'll share:
When replacing the original BB (Shimano loose-ball M730) on my '88 Schwinn
KOM, the cups on both sides were very difficult to thread in the final
Turns out, the ends of the seatstays protrude a bit into the BB shell. I
was able to figure it out because I noticed that the threads on the
cartridge BB were starting to get beat up in a specific spot.
This protrusion was no issue with the loose-ball cups, which are only about
10-15 mm deep. Lots of open space in a loose-ball BB.
I grabbed the Park BB tap at the shop I work for, and I was able to
flush-thread the protruding ends of those seatstays (and clean up the
original BB threads). Now, the cartridge BB threads in and out very easily.
Since your '93 XO-2 was originally equipped with a loose-ball BB, there's a
chance that you have a similar issue.
On Fri, Sep 16, 2016 at 10:46 AM, Conway Bennett <
> I'm swapping out BBs on my '93 XO-2. When I thread in the drive side it
> goes in no problem. Then I go to thread in the non drive side cup and it
> will not thread in all the way. It is sticking out about 1 full thread. I
> removed the NDS cup and then the drive side BB. Then just out of curiosity
> I installed the NDS cup independently and it did thread all the way. So,
> knowing it's the the not correct sequence, I the tried threading in the DS
> BB with the NDS cup already in and it would not thread all the way. This
> is a shimano cartridge type but that Riv sells, 1.37 X 24 which is the same
> size but not type as the one I removed. I know it's important to have the
> BB threaded all the way but read that the cup cab stick out a bit but I'm
> just not comfortable with that. FWIw this is a NOS frame so no mangled
> threads or rust. Thanks in advance!
> Fair winds,
> Captain Conway
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