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Cinelli Bivalent hub set made by Merz

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Cinelli Bivalent hub set made by Merz

Old 05-16-23, 07:32 PM
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Cinelli Bivalent hub set made by Merz

The Jim Gentes thread mentioned Bivalent hubs. I made several sets of these Cinelli Bivalent hub reproductions. They are visually and functionally faithful to the 2nd generation one piece versions that were introduced in the mid 1960's. I incorporated 6001 sealed bearings inside the hub bodies instead of cup and cones, this worked out nicely. Almost all the steel parts were made from 6-4 titanium. The freewheel used on the original hubs were made by Regina, it has splined teeth where the mounting thread normally goes and a sealed bearing in the center. I did not reproduce this item. I did convert some aluminum Campagnolo freewheels, I cut the spline teeth and installed 2 sealed bearings inside the body. The full set with the Campy freewheel saved about one pound over the stock Cinelli Bivalent set! making these parts was a labor of love, a crazy amount of work. These hubs were very cleverly designed, and would have been extremally difficult to make back in the day. More photos here:

https://photos.app.goo.gl/RimfJdMdQV6gvgPK8
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Old 05-17-23, 12:29 AM
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Very, very impressive.

Did I say it was impressive? Excellent machine work.
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Old 05-17-23, 08:14 AM
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The Cinelli Bivalent hubs are one of those intriguing, quirky designs that just didn't catch on in the marketplace. Harvey Sachs displayed his Cinelli with the Bivalent wheels (and M71 pedals) at one of the recent-ish CR gatherings, which was the first time I'd seen it in person. Really interesting.
Let me share a few pics...

the bike:


rear wheel:


fork and front quick release:




I do a lot of electronics, and have spent way too much time on quirky projects that only a few friends can appreciate, so I think I can understand the urge to create these hubs. One advantage of these hubs is that most people can at least understand the precision and light weight of the final result. Very cool!

Steve in Peoria
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Old 05-17-23, 08:39 AM
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these are so unusual and interesting, beautiful work by Jim ! maybe better than the original

There were a couple other attempts at building hubs where the FW or cassette stayed with the frame on a wheel change

It seems to me that the problem with that approach is the concentration of loads at the hub / freewheel interface.

in order to make the rear wheel easier to remove the spline has to be fairly shallow, which means small surface area thru which the pedal effort is transferred to the wheel

On the Bivalents that hub to FW spline has been known to strip out. I think this was the problem with the original ones.

they sure are cool !

/markp
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Old 05-17-23, 11:00 AM
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Portlandjim I became exposed to some of your works through this forum, and maximum respect for what you have done. Like merziac 's bikes, and the stem you posted earlier, these recreations are also true works of art, congratulations, and a huge thanks for signing up and personally sharing these with us!
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Old 05-17-23, 11:13 AM
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Jim makes fabulous small parts. His titanium crank bolts are the best ever

/markp
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Old 05-19-23, 11:56 AM
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Couldn't imagine the amount of hours put into these hubs. Absolutely among the top and unique. Certainly get the 'labor of love' aspect; much respect. Thanks for sharing.
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