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What threading is this BB?

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What threading is this BB?

Old 06-24-11, 12:15 PM
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3speed
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What threading is this BB?

Maybe I should check the road forum, but I have a feeling you guys will still be more helpful on this sealed BB. Anywho, it says the following things BB-UN73, 68, and BC1.37x24. A quick online search came up with a lot of them for sale, but none of the things seemed to tell about the threading. I've tried to thread it into 3 bikes to see if it fit, 2 of which I'm sure were whatever Japanese bikes used(Miyata and Cierra), and the other was a bike made in the UK in 74(Ellis-Briggs). This BB won't thread into any of those.
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Old 06-24-11, 12:29 PM
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nlerner
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English/Japanese threading.

Neal
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Old 06-24-11, 12:34 PM
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3speed
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Hmm... I guess I'll have to go try threading it into the Miyata again.
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Old 06-24-11, 01:32 PM
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Careful. The Miyata might have Japanese threading.
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Old 06-24-11, 01:41 PM
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3speed
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Weird. It went right in. I don't know why it wouldn't before. I even fiddled around trying to get it to thread in ~4 times before deciding it wouldn't work. Not sure what the problem was. I'm glad it works, though, since it's perfect for the Miyata 914 frame I just bought!

Thanks Neal!
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Old 06-24-11, 01:43 PM
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The threads don't always seem to be well terminated on those cartridges... brand new out of the box and I've had trouble getting it started.

At least they are cheap.
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Old 06-24-11, 02:01 PM
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Indeed, at least they are cheap. This one came free as far as I'm concerned, so even better. I bought an early 90s Shimano 600 group that someone had just built a bike with and he threw in the basically new BB and cassette because he was selling the frame and wheel-set separately anyway. The only problem I'm having now is that I was going to sell the 600 group, but I just got a 91' Miyata 914 frame-set yesterday and the 600 would go perfectly on it. All things considered, I'd end up with a period correct Miyata 914 in good condition with a Really good condition 600 drive-train, the bike only needing wheels, and only $80 in so far. If I keep that 600, I could have a nice bike to ride for maybe ~$150-200. Grrr... I hate these situations.
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