Square taper BB without shoulder on the cups?

[oliver1850]

Originally Posted by NHAero

You folks are a great historical resource!
I'm going to fool with the Shimano BB and Phil Wood cups tonight, that's a simple low cost solution. Then I may look for more obscure vintage products. I'm hoping for a 103mm spindle, and I think there were Dura Ace 103mm BBs in the UN format.
Thanks!

Yes, 7410. Sampson, Syncros and TNT all made 103s with adjustable chainline.

[smontanaro]

Galli roller bearing bottom brackets had adjustable cups on both sides as well. A couple have passed through my parts bin. It's a shame they are hidden away inside the shell. They are really quite handsome. I'd dredge up a pic but I'm on my phone, and Flickr's app kinda sucks.

[NHAero]

I tried the Phil cups on the Shimano and that looks as though it might accomplish what I want. I ended up ordering the top end Tange Seiki off of eBay, the LN-7922 - has to come from the UK so will take a couple of weeks. Less money than a used Dura Ace of uncertain condition. It may work as designed, with the DS shouldered cup, and so I may not need to fool with moving it from its intended location. But as folks have pointed out, there are options!
Thanks much!

[smontanaro]

Originally Posted by smontanaro

Galli roller bearing bottom brackets had adjustable cups on both sides as well.

Just for completeness, now that I'm in front of a real computer:

[NHAero]

That's pretty cool, have never seen that before.

Originally Posted by smontanaro

Just for completeness, now that I'm in front of a real computer:

[Hellgate]

1 character...

[NHAero]

See the link in Post #11!

Originally Posted by Hellgate

My favorite was the old MAVIC 610 BB. Attachment 1697973498

[Hellgate]

Originally Posted by NHAero

See the link in Post #11!

Well I'll just delete my post then. Clearly wasted electrons...

[NHAero]

Oh, you misunderstood me - I meant, you can have one again! It wasn't meant at all as a snark

Originally Posted by Hellgate

Well I'll just delete my post then. Clearly wasted electrons...

[oliver1850]

Originally Posted by smontanaro

Just for completeness, now that I'm in front of a real computer:

That looks like it would hold up forever.

[dddd]

The better Shimano cartridge bb's with alloy cups were laterally adjustable once the driveside cup flange snapped off, still leaving enough splines to turn the cup.

I found this out by accident of course.

But if the expected adjustment is to be toward the driveside, all one needs is a fixed cup spacer to fine-tune the chainline.

Of course once we get down to 103mm JIS there will be no narrower JIS bottom brackets to be found, at which point the flange removal option might be useful.

Another nice arcane thing about the Shimano bb's with alloy cups is that they can be "worked" into a Swiss-threaded bottom bracket with no frame damage, and quite happy to stay put. The key here is the robust splines allowing heavy back-and-forth torquing to be applied.