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How come is inner peak of the rims of Campagnolo Zonda wheel shaped flat?

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How come is inner peak of the rims of Campagnolo Zonda wheel shaped flat?

Old 09-10-19, 03:21 AM
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Quintessentium
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How come is inner rims of Campagnolo Zonda wheel shaped flat?

Was thinking to buy Campy wheels in my price range as I heard they were quiet hub

but I just don’t understand the inner shape of the rim at all !

Are there any additional attachment that I don’t know!?





flat mountain



flat surface would confront the air!

Last edited by Quintessentium; 09-10-19 at 08:19 AM.
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Old 09-10-19, 05:38 AM
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Please can you ask your question in a clearer way?
Do you mean the inner surface where the spoke nipples are (and the areas between the nipples) or do you mean the inner surface where the tyre sits?
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Old 09-10-19, 06:11 AM
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Originally Posted by gfk_velo View Post
Please can you ask your question in a clearer way?
Do you mean the inner surface where the spoke nipples are (and the areas between the nipples) or do you mean the inner surface where the tyre sits?
Where the inner surface nipples are and between

thank you!
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Old 09-10-19, 06:43 AM
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Originally Posted by Quintessentium View Post
Where the inner surface nipples are and between

thank you!
I noticed this on mine and thought it was simply a style thing, that maybe it shaved a bit of weight and/or added strength (like "boxing" a frame on a car).

Someone w/inside or actual technical info would be interesting!
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Old 09-10-19, 07:01 AM
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The extra material around each spoke nipple adds strength. If the entire rim was shaped that way, the wheels would be extremely heavy. The inside surface has no holes to weaken the rim. A magnet is used to pull the nipples to the spoke holes. The Zonda is one of the best wheel values, particularly if purchased from a euro source for $320, including shipping.
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Old 09-10-19, 07:22 AM
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Whatís your question - the lack of holes for nipple access?
Thatís getting to be fairly common. Mavic has some like that too. Probably other manufacturers as well.
Flat vs concave bottom of the tube/tire side of the rim profile doesnít matter much, as long as there is enough difference between the min/max diameter of the rim.
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Old 09-10-19, 08:20 AM
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Originally Posted by Quintessentium View Post
inner rims
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Old 09-10-19, 08:32 AM
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I think the OP is concerned about the aerodynamic efficiency of the boxy section of the rims.
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Old 09-10-19, 08:43 AM
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Then don't use this rim with it's "concerned" shape. If one were competing and one's pay check depended on this stuff then I can easily see who the minutia might benefit one's life. But most of us here are just having fun when we ride. Sure we delude ourselves by calling this fun "Training" or "Racing" but even at the local racing level it's all about how we want to have fun. So make a choice and go have fun. Andy.
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Old 09-10-19, 09:56 AM
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They have to be shaped in some way and regardless of which way you could always ask why.
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Old 09-10-19, 11:51 AM
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Originally Posted by Quintessentium View Post
but I just donít understand the inner shape of the rim at all !
I suspect they're doing it to achieve a high strength:weight ratio at their price point. The rims are probably extruded with a thick rounded section at the bottom that's strong enough to withstand the force from the spoke nipples, but machined flat to save weight in places where there aren't spoke nipples.

Does this result in worse aerodynamics? Probably. Plenty of entry-level wheels aren't overly concerned with aero, though. Heck, it was only a few decades ago that essentially all wheels had rectangular profiles.
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Old 09-10-19, 11:58 AM
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Cosmetic removal of a few milligrams.
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Old 09-10-19, 02:00 PM
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I'd believe that, at this level wheel, saving a bit of weight is more significant and noticeable (to the end user) than saving a few seconds bc of aero.
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Old 09-10-19, 02:47 PM
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I do agree that the wheel having the channels cut into the rim between the spokes leaving a surface that is orthogonal to rim movement (that is, the cuts create blunt faces that have poor aero qualities) is poor form. But they are small surfaces. The cut out sections remove weight. And these are pretty well-regarded rims (durable, efficient) for normal riding So I don't think its a biggie.
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Old 09-10-19, 05:49 PM
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Campy offers the even less expensive scirocco that has the more aero shape. It uses conventional spokes and requires rim tape.

The bearings are a less expensive cartridge type, but many high dollar wheels use them, so it's not necessarily a negative.
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Old 09-10-19, 07:44 PM
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With the spokes spinning around I doubt there's enough clean air in that area to make any aerodynamic difference. IMO, at that weight / price they are remarkably aero compared to the alternatives.
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