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The Adjustable Cup Is Going All The Way In?

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The Adjustable Cup Is Going All The Way In?

Old 02-28-10, 09:36 PM
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estasnyc
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The Adjustable Cup Is Going All The Way In?

Well, Almost all the way in.

Seeing excessive play on the bottom bracket of my old Panasonic Sport 500 commuting frankenbike, I decided to replace both cups and the bearings. The bottom bracket has english threading as does the new cups that I purchased onto the existing bb spindle. Everything fits together perfectly...

Except...

Except that the adjustable cup goes so far in that I can't get the lock ring on.

I didn't know what to make of this until I came here and browsed over to another thread about a Bianchi bottom bracket.

Apparently, an english bottom bracket is supposed to be 68mm wide while an italian one is 70mm.

Not mine. Sure enough, when I measure the bottom bracket width on the frame, I find it to be 70mm.

As I've said, the bottom bracket definitely has english threading. I learned that unambiguously when I took off the fixed cup and replaced it.

The question now is: What should I do next?

This may actually end up working in my favor because I've been toying with the idea of replacing the 52/42 crankset on my vintage Bottechia with a 175mm Campagnolo 53/39 but wasn't sure if I wanted to toss the old crankset.

If I can install an italian bb spindle into the Panasonic then transplanting the Bottechia's old crankset over to this should not be a problem.

Can I do this?

BTW, the Panasonic's original crankset is a crappy one using cotter pins to mount onto the spindle but I didn't care since this is a beat-up old commuting bike.
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Old 02-28-10, 10:38 PM
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70mm does not automagically mean ITA threading although for the vast majority of the case it is. For example, that bianchi thread davidad is not entirely correct - 70mm english threaded japanese bianchi's were made. The only surefire way to ascertain whether it's ITA/English is thread direction and shell diameter. ITA being larger.
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Old 02-28-10, 10:45 PM
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Throw an Italian spindle in there, but you'll need to match the length/symmetry/taper.

Campy 53/39 I take as being a modern crankset. Use a modern cartridge BB if you go this route.
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Old 03-01-10, 12:34 AM
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Originally Posted by operator View Post
70mm does not automagically mean ITA threading although for the vast majority of the case it is. For example, that bianchi thread davidad is not entirely correct - 70mm english threaded japanese bianchi's were made. The only surefire way to ascertain whether it's ITA/English is thread direction and shell diameter. ITA being larger.
This definitely has english threading. Have no doubt about that. This is proof that 70mm english-threaded japanese bicycles were made.

I'm not thinking about putting in a complete italian bottom bracket. Only the spindle. What I don't know is whether the diameter of the spindle may be too large for where it should come through the english-threaded cups.

Originally Posted by Ex Pres View Post
Throw an Italian spindle in there, but you'll need to match the length/symmetry/taper.

Campy 53/39 I take as being a modern crankset. Use a modern cartridge BB if you go this route.
I don't know if it was your intention but you've raised a good point that I never considered: the compatibility between the crankset and the bottom bracket. I know nothing about this.

My original thinking was to try to buy a cheapie italian bb spindle, if possible, put it into the Panasonic and then transplant the crankset over from the Bottechia. I would then get a replacement crankset for the Bottechia with the specs I've mentioned (175mm & 53/39) which is all of what I'm aware of.

I measured the bottom bracket length on the Bottechia frame and see that it is also 70mm. This means that I may already have a compatible spindle to go into the Panasonic: the one inside the Bottechia. That is, again, if I can use it with the english-threaded cups on the Panasonic.

This may free me to get a crankset and bottom bracket that are completely compatible with each other and with Bottechia frame.
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Old 03-01-10, 02:23 AM
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Sounds like a good plan; suck it and see I reckon.
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Old 03-02-10, 01:35 PM
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The Panasonic's bottom bracket adjustable cup now sticks out too far with the italian bb spindle installed. Looks like I'll need to remount the fix cup with a spacer. I see that such a thing is made but the nearest choices are 1.8mm or 2.5mm. I'm not sure which would be the better choice or if 0.7mm even matters.

At least this won't be a wasted effort if I should end up putting this spindle back on the Bottechia. I've been meaning to repack the bearings.
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