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Tricky rim weight question.

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Tricky rim weight question.

Old 03-16-09, 07:57 PM
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Banzai
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Tricky rim weight question.

Does anyone here know the weight of the rim on a Mavic Ksyrium Equipe wheel? I can find other specs on the entire wheel easily enough, but I'm trying to figure out what the rim weighs.

I have a myriad of reasons for doing so. Help is appreciated.
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Old 03-16-09, 08:53 PM
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Shown as 498 and 510 g on http://weightweenies.starbike.com/li....php?type=rims
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Old 03-16-09, 08:53 PM
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Old 03-17-09, 06:47 AM
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Thanks.

Here was my thought, though with that weight it's not a good one:

I reasoned, based on the weight of the wheel itself, that the rim must be pretty hefty given the low spoke count of the wheel. After all, I can build a 32 spoke wheel of equivalent weight pretty easily. Unlike the other Ksyrium models, the Equipe is constructed with "standard" spoke holes and spoke nipples, meaning that, in theory, you could lace the hubs with their "isopulse" pattern to any appropriately drilled rim.

Not that I want to throw away perfectly good rims, but in time these will wear, and rather than buy new wheels, the rim could be up for replacement.

My initial thought was a CXP-33, but the lowest drilling it's available in is 28.

Then, I wondered if a Velocity Deep V was lighter than the Ksyrium Equipe rim. It's more aero, and it comes in every drilling under the sun. However, it turns out that even the hefty Equipe rim is lighter than a Deep V...so such a swap would be counter-productive, unless it was for the sole purpose of extending the life of the wheel, or for looks.

Anyhow, thanks for the link and the help.

Cheers!
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Old 03-17-09, 06:19 PM
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I've been told by my LBS guy that Ksyrium replacement rims cost over $200, I think he said $230 and I think he was referring to one rim only.

Whatever the exact figures were, they were discouraging and it makes me want to stick with more conventional wheels. If I had some K's, I would just ride them into the ground and then go to some conventional wheels as replacements.

My web search for "mavic ksyrium replacement rim" yielded nothing. I guess it's dealer only and I'm guessing you can get them only if the dealer rebuilds the wheel.
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Old 03-18-09, 06:31 AM
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Thing is, I think the hubs and spokes/spoke patterns are pretty cool.

The rims are unremarkable; neither light nor aero.

I thought a re-build with Velocity Deep Vs would add both some aesthetic appeal, and some aero benefit. Maybe I'll post a new thread on this to generate some opinions...
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Old 03-18-09, 08:36 AM
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Originally Posted by Banzai View Post
Maybe I'll post a new thread on this to generate some opinions...
Big ERD difference in those 2 rims would mean a spoke length change.

I believe the head on the Mavic spokes are proprietary, and standard straight pull will not work.

You might be able to cut the stock spokes down to length.
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Old 03-18-09, 09:37 AM
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The Ksyrium Equipe uses straight pull spokes...but standard brass spoke nipples. Either way, yes, the ERD would be quite different, and would require new spokes.

I'd just need to buy some Sapim CX (not cx-RAY) spokes and build it up.

The big question is; would the aero benefit be "worth it"? The Equipe's rim is 24mm, and mostly "box" shaped. 500g. The Deep V is 30mm, with more of an aero shape...but it weighs 520g. (or more!) I'd lose some weight with the shorter spokes, but that's hardly significant.

I wonder if the extra aero offsets the extra weight? I.e. is +5mm/aero shape more of a performance gainer than the 20g of rotational weight is a performance loser?

Beyond that, I'm just feeling the urge to tinker, and I'm rolling ideas around my head. I'm a compulsive tinkerer...(Mrs. Banzai hates it!)...and I've been without a project for a little while. Maybe I should scrounge up a used Equipe on e-bay to pull apart, rather than potentially messing up a perfectly serviceable wheelset on my end.
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Old 03-18-09, 10:37 AM
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Well, what is the order of priorities?

I'm guessing it's:
1. aerodynamics
2. lightness
3. rebuildability
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Old 03-18-09, 10:44 AM
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Originally Posted by thirdin77 View Post
Well, what is the order of priorities?

I'm guessing it's:
1. aerodynamics
2. lightness
3. rebuildability
Well, the priorities depend alot on the answer to my question below (from above). It's always offsetting factors in these projects, after all.

Originally Posted by Banzai View Post
I wonder if the extra aero offsets the extra weight? I.e. is +5mm/aero shape more of a performance gainer than the 20g of rotational weight is a performance loser?
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Old 03-18-09, 11:10 AM
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does the hub end of the spoke look like this? or, is it round?

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Old 03-18-09, 11:15 AM
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Hub end is just a flattened metal "knob", if you will. The rim end is a standard 2.0mm threaded, with a standard brass spoke nipple.

It looks like a Sapim CX or a DT Aero spoke will work just fine.

I don't have the wheels with me right now, though.
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Old 03-18-09, 11:37 AM
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Originally Posted by Banzai View Post
Then, I wondered if a Velocity Deep V was lighter than the Ksyrium Equipe rim. It's more aero, and it comes in every drilling under the sun. However, it turns out that even the hefty Equipe rim is lighter than a Deep V...so such a swap would be counter-productive, unless it was for the sole purpose of extending the life of the wheel, or for looks.
How about a Kinlin XR-300? It comes in many drillings and is pretty light at about 460g.
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Old 03-18-09, 11:40 AM
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Originally Posted by urbanknight View Post
How about a Kinlin XR-300? It comes in many drillings and is pretty light at about 460g.
Holy cow...

That might be just the ticket. Thanks!
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