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My Superbe Pro cranks and bottom bracket -- the rest of the story

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My Superbe Pro cranks and bottom bracket -- the rest of the story

Old 01-20-13, 01:32 PM
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DOS
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My Superbe Pro cranks and bottom bracket -- the rest of the story

To bring to a close the issue I raised some time ago in this thread -- https://www.bikeforums.net/showthread...ain?highlight= -- I finally tracked down and installed a superbe pro bottom bracket to match the Superbe Pro cranks I have been running with a Campy bottom bracket. I bought the 113mm assymetrical spindle I needed for my mid 80s cranks separately, and then found a 90s superbe pro BB on ebay the cups from which I figured would work with my spindle even thought it has a 112mm symmetrical spindle (as I noted in above thread, I had originally planned to match the 113mm spindle with my campy cups but failed to recognize that the thin campy cups would not work with the spindle with just a 49mm section between the cones -- aka "C measurement"). The cups work great and the BB and cranks are installed and operational. Here are some things I learned from this process:

1. I still don't know if there is any difference between the taper of my 80s superbe pro BB and standard Campy ISO but the Suntour taper is definitely not JIS. Eyeballng the campy spindle, I can convince myself that the campy spindle is not precisely the same, it appears to be maybe a hair thinner at the tip but when I measure with my crappy calipers I get numbers so close between the two (10ths of mm) that I can't say for certain.

2. Both the Campy spindle and the 113mm Suntour one have same measurement from cone to tip on the drive side, however with cranks installed on suntour the cranks sit just a hair further outboard than with Campy. With campy, the inner ring of the cranks cleared the chainstay by the slightest of margins, with Suntour there appears to be a slightly bigger gap (I lack the tools to measure chainline to a level a precision to tell for sure so its possible I am imagining this). Anyway, assuming I am not imagining this, not sure if this is due to a slight difference in taper or fact that the Suntour spindle has really beefy cones -- easily twice as thick as the campy cones or the cones on the 90s 112mm spindle that came with the cups I am using.

3. In comparing the 80s Suntour spindle to the 90s Suntour spindle, a couple of things. As I noted, the 80s spindle had really fat cones and is asymmetrical while the 90s spindle is symmetrical and one cone has a groove machined into the top of it all the way around. I have no idea why that would be. Also, the 90s spindle -- which appears to come from A Superbe Pro SB11 BB (according to markings on cups) -- says Suntour and SB91 on it while the 80s one says Superbe and 68W. As for taper...

4. I had always read -- on sites like this one https://velobase.com/ViewComponent.as...1-e4e6fabcdb62 -- that 90s Superbe pro BBs used JIS taper. But the 112mm spindle that came with the cups I am using is not JIS. It is same as the 113mm spindle I am using (I tested by matching with a JIS crankset I have and both spindles would bottom out if I tried to use them with these cranks). So I still have no idea when or if Suntour went JIS with Superbe pro, nor whether there is any difference between Suntour taper and ISO but I now have the right BB to go with my 1985 superbe pro cranks.
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