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BB to Crank match question?

Old 01-29-11, 03:46 PM
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rothenfield1
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BB to Crank match question?

I bought a Suntour Superbe Pro double crank dating to '85 according to the stamp code. I looked it up on Velobase and found conflicting info on the 2 that appeared similar. One was CW-5000 with JIS taper, the other CW-6000 with ISO. The 5000 is a single/pista, but the "S" stamped on the arm is the same as mine. It was listed as ISO taper. The other was a double, but was listed as a JIS taper and recommended a 109 spindle length. The seller told me he ran a Superbe BB with 113 length, but a shorter one would probably have provided a better chainline.

This is going on an Italian BB shell with Campy 7spd freewheel. I have read that Campy BB's will work with Superbe, but doesn't that depend on whether it is JIS or ISO. Is there a way to tell if a crank is one or the other, and how can I tell what would be the best spindle length without guessing?
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Old 01-29-11, 03:51 PM
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fietsbob
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what would be the best spindle length without guessing?
Have several lengths on hand to try?
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Old 01-29-11, 03:57 PM
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Originally Posted by fietsbob View Post
Have several lengths on hand to try?
Unfortunately, no Italians. Also remember reading somewhere in Sheldon's that Suntour changed their crank tapers at some point around this time. I have my eye on a relatively cheap Campy BB with 111 length that I am tempted to buy just to try.
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Old 01-29-11, 04:42 PM
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Originally Posted by Old Fat Guy View Post
FWIW, I had a Superbe English BB on an Italian. It worked fine, just not a lot of thread to grab on to on the adjustable side. I'll measure it later today and post up the length.
Now you have me completely confused OFG, (not that difficult to do). I dug up a C&C BB off an '85 Centurion, and although it is marked, I'm sure it's a generic Sugino or Shimano ISO taper english thread.

1) The shindle only slides into the crank about half-way to the previous insertion mark. I'm assuming JIS taper spindles are a little narrower allowing the crank to slide all the way bottom of the taper, leading me to believe these cranks are indeed JIS.
2) When I take one of the cups from this generic english BB, it will completely insert into the Italian BB shell without touching the threads. How'd you get an English cup to work on an Italian shell, or am I misunderstanding?
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Old 01-29-11, 07:15 PM
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[QUOTE=rothenfield1;12151079]Now you have me completely confused OFG, (not that difficult to do). I dug up a C&C BB off an '85 Centurion, and although it is marked, I'm sure it's a generic Sugino or Shimano ISO taper english thread.

1) The shindle only slides into the crank about half-way to the previous insertion mark. I'm assuming JIS taper spindles are a little narrower allowing the crank to slide all the way bottom of the taper, leading me to believe these cranks are indeed JIS.

JIS spindles are the fat, stubby ones.
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Old 01-29-11, 10:36 PM
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Forgive me, I think I was getting JIS and ISO confused. One sits at the tip of the spindle taper, the other seats all the way down onto the taper. Man, life was so less complicated working on strictly JP stuff. Stepping over into the realm of Campy is like starting from square one.

Any way, I have this crazy Italian bike................
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Old 01-29-11, 10:52 PM
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OK, I think I'm getting the picture in my mind know, ISO has a long taper where the crank rest at the tip, you could probably cut an 1/8" off the tip and have a relatively close JIS where the cranks seat at the bottom of the taper. I just read that the Superbe taper was somewhere between these 2 standards. But, by my little test, it clearly would seat better with the short JIS spindle than the ISO.
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