XO-2 BB help!

[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

[Keith Muller]

Conway,

With a Shimano BB, that is a non-issue. The NDS cup is there to support the cartridge BB. It's pretty common to see that. The extra thread is there so the cup can tighten down on the BB before it bottoms out on the BB shell. As long as the cup is straight in the BB shell, you are fine.

Keith

[Captain Conway Bennett]

Thanks, with my Sam H. And Quick B. They go in almost flush on the NDS so I was concerned.

Fair winds,

Captain Conway Bennett

> --
> You received this message because you are subscribed to a topic in the Google Groups "RBW Owners Bunch" group.
> To unsubscribe from this topic, visit https://groups.google.com/d/topic/rbw-owners-bunch/-BREMsow9Fw/unsubscribe.
> To unsubscribe from this group and all its topics, send an email to rbw-owners-bun...@googlegroups.com.
> To post to this group, send email to rbw-owne...@googlegroups.com.
> Visit this group at https://groups.google.com/group/rbw-owners-bunch.
> For more options, visit https://groups.google.com/d/optout.

[Tim Gavin]

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 couple mm.

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.

Tim

--
You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group.
To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscribe@googlegroups.com.
To post to this group, send email to rbw-owners-bunch@googlegroups.com.

[Joe Bernard]

Yep. The OP may be running into the cable-guide bolt protruding from the bottom, too. I've done that a bunch of times.