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mavic open pro versus CXP-33 quesiton(11 posts)

mavic open pro versus CXP-33 quesitonmaximum15
Nov 26, 2002 10:01 AM
I have the fever for a new set of wheels. These will be to replace Rolf Vector Comps. I like the looks of the aero style CXP-33, but most of my riding isn't fast enough to realize the aero effect (and 32 spokes won't be very aero either). So, in the opinions of those with experience, which would be better? All my riding is on flat ground, mostly by myself. Pavement is very smooth and more than half the riding would be commuting. Typical speed would be 16 to 20 mph. What do you think, any reason to choose one over the other?
re: mavic open pro versus CXP-33 quesitonChen2
Nov 26, 2002 11:15 AM
You could base part of your decision on the total weight of bike and rider. I have a riding bud who weighs ~245# and he has bent two Open Pros. The CXP 33's are more rugged. I weigh 165 and have two sets of Open Pros with no problems. Or if you are a light-weight you could build some Open Pros with light spokes like DT Revolutions. You could even go with fewer than 28 spokes.
~Al
Then why do you need new wheels?gnailuh
Nov 26, 2002 11:24 AM
If you ride on flat grounds at 16 to 20 mph... why do you need new wheels? Rolf Comps would be great. Is it just an itch?
I've owned all three wheels you mention...Quack
Nov 26, 2002 12:06 PM
As far as aero effect goes, the Vector Comps are your fastest option of the three. Tallest, narrowest, and lowest spoke count. The one reason I would urge you to build new wheels, especially if you ride aluminum, is comfort. Vector Comps are very stiff wheels, low spoke count with sky-high tension and rigid rims are not real good for the 100+ mile touring pace that you mention riding. I believe both OPs and CXP-33s will build into wheels lighter than or the same weight as the Rolfs.

If you are into saving a bit of weight, and are under 200, I would go with the Open Pros. An added benefit is that they are much more accepted in the social circles of club rides than CXP-33s, if you care about that. The CXP-33s are dead reliable, tough as hell, and only slightly heavier than the OPs. Plus the slight aero-profile looks better(I think) than the OPs. For commuting, I would go with the CXPs. I put about 6000 miles a year on my bike commuting and never hesitate to take shoulders, bunny-hop curbs, or even jump the occasional driveway entrance on them. They have served me well through all the potholes and wheelies I've thrown at them.

The OPs seem to be a bit less durable. Everytime I rail on them, they seem to end up in the truing stand. But they are light and I would choose them for the sprint any day.

All three are great choices for good overall wheels but I would go with the CXPs.

Larry
re: mavic open pro versus CXP-33 quesitonMXL02
Nov 26, 2002 12:16 PM
I own both and love them both. I weigh 200lbs, so I tend to ride the CXP-33's more, they are more rugged. I like the Open Pros...they are light and fast, and mine have been quite tough as well. I was going to recommend the open pros until you mentioned commuting...in my city, commuting can be very hard on wheels and tires due to the poor quality of the roads...I would recommend the CXP 33's if you want a rugged fast wheelset.
Velocity AeroheadKerry
Nov 26, 2002 5:06 PM
Lighter and a bit stronger than the Open Pro, plus no threat of clicking noises, and a bit cheaper.
Velocity AeroheadPsyDoc
Nov 27, 2002 3:31 PM
Kerry, Joe Young indicated to me that the aerohead is made out of "softer" metal than comparable rims and does not deserve the reputation that it has. Do you know if this is so or was he just trying to sell me on a different rim...the Open Pro matter of fact.
AlloysKerry
Nov 27, 2002 4:46 PM
I have no real information on the alloy used in the the Open Pro. When the OP came out, the alloy was designated MAXTAL S 6000, which tells us only that it is a 6XXX series aluminum. There are 68 alloys in the 6xxx series, and 43 in the 7xxx series, and no aluminum supplier sells anything called MAXTAL. The advantage of not disclosing the alloy is that claims can be made that can't easily be challenged. For example, MAVIC claimed the OP was "30% stronger" than the Reflex 6106 alloy. Without even thinking about how deceptive a statement like that is, many believed that it was the alloy that was "30% stronger." MAVIC did not point out that the rim was also 15-20 gm heavier than the Reflex and had a different profile.

The Aerohead uses 6106-T6 aluminum - the T6 means that the alloy is post-heat quenched and artificially aged. This is a very good alloy, and it would be hard to describe it as "soft" compared so an unknown (but also 6XXX series) alloy. Beyond that, the Aerohead has a great reputation, with no reports of rim cracks, etc. that have plagued MAVIC stuff. I'm going to have to call BS until MAVIC coughs up some data to support their claims. Don't hold your breath but do expect sales pitches like you got from Joe Young.
Velocity AeroheadTechniKal
Nov 29, 2002 7:26 PM
I don't know about the metalurgy, but I do know that the wheels that I've built up with Velocity rims (both road and mountain) have been more prone to brake track 'dings' than comparable rims from Mavic, Sun and Bontrager. These dings can be straigtened with a cresent wrench and don't seem to impact the integrity of the wheel/rim, but I would be hesitant to recommend Velocity rims to anyone that rides very rough roads or very rocky trails.

It's a shame, too. Other than this problem the Velocity rims have been superb - decent weight, good value, easy to build, lots of color choices, etc.
re: mavic open pro versus CXP-33 quesitonrussw19
Nov 26, 2002 5:08 PM
Zipp (I think) used to have something on their website about their wheels and aerodynamics. It said that the rim's height had to be 3 times that of the width. Meaning if the rim was 20mm wide, it has to be 60mm tall to have an actual aerodynamic advantage. The CPX 33's don't fit that formula, so it would stand to reason that they are not very aero. Now the other factor you are not thinking of that will make a huge difference is the weight of the wheelset. Rotational Inertia is a huge factor in wheels. Do the physics if you like, but lighter wheels are faster wheels. As long as the wheel is strong enough to support both your riding style and weight, get the lightest wheels you can. But if you want to go aero, get some tri-spoked wheels or even better, discs, but at least a deep v rim.
I prefer the CXP-33, they are really strongPeterRider
Nov 27, 2002 8:32 AM
... had the Rolf Vector Pros earlier this year, didn't really like them and sold them.

Pierre