Rim choice for fixed wheel TT bike.

I don't get it. I skimmed that and all I can see is that it is saying that aero wheels are more aero than non-aero wheels = no shit. But, how much time will it save you in a TT compared to cheaper mods like removing bottle cages, shaving, wearing a skinsuit, etc.

It was suggested that Open Pros with fewer spokes may be the way to go, and the article indicated that fewer spokes on a box section rim does not help at all. Aero rims are definitely the way to go for TT speeds, regardless of the weight difference. Maybe this article would answer things a bit more definitively.

http://www.cervelo.com/content.aspx?m=Engineering&i=Aerodynamics

I think the suggestion is that it's an expensive way to save not very much time compared to other options.

Of course, if the exercise is just to find a 'scientific' excuse to buy Deep Vs for the bling, then have at it.

It was suggested that Open Pros with fewer spokes may be the way to go, and the article indicated that fewer spokes on a box section rim does not help at all. Aero rims are definitely the way to go for TT speeds, regardless of the weight difference. Maybe this article would answer things a bit more definitively.

http://www.cervelo.com/content.aspx?m=Engineering&i=Aerodynamics

Open Pros aren't box rims though :S

Get used track Shamal's ? :)

weird question thats loosely related spotted a mavic cxp30 wheelset on bumtree, think the seller has got them set up with tubs but was wondering if they'll take inners and tyre, been looking around for info but the search has proved fruitless :s

tubs are glue on only, sadly you can't put clinchers on them.

It seems to be lodged in my head that there is no aero advantage for rims that are less than 40mm deep, so using deep-v's / CXP30's / CXP14's etc has little bearing. I do ride CXP30's however because they look nice and are pretty robust. Have the goldtech's in pewter also, they are sweet! Not too impressed with my spindles knurling over though as I can't get the caps off to change the bearings.

I think I'd use the wheels you have and concentrate on training and tribars to get your time down, good luck!

It was suggested that Open Pros with fewer spokes may be the way to go, and the article indicated that fewer spokes on a box section rim does not help at all. Aero rims are definitely the way to go for TT speeds, regardless of the weight difference. Maybe this article would answer things a bit more definitively.
http://www.cervelo.com/content.aspx?m=Engineering&i=Aerodynamics

I see although I didn't suggest Open Pros for a TT machine. I suggested clothing choice, positioning and training has much more impact on your TTing and it would be better (and far cheaper) to worry about these aspects before shelling out on expensive aero wheels. BMMF suggested CXP33s which would seem to offer a suitable advantage for little cost difference compared to Open Pros. Since you could leave these built as 32h rather than silly low spoke count, they'd be fine for most riding rather than TT-only wheels.

[FONT=Tahoma][SIZE=2]Paul Merlo's results indicated that the box shaped rim is very inefficient aerodynamically and it is hard to improve the characteristics of this type of wheel by changing the spoking pattern. Using aerodynamic spokes and reducing their number will decrease the drag on this type of wheel slightly, but using a standard aerodynamic rim such as the Campagnolo Omega or the Velocity aero has a greater influence on reducing drag. For instance, a wheel with 32 round spokes in a Campagnolo Omega rim had less drag than a wheel with 16 round spokes in a box shaped rim.[/SIZE][/FONT]

I think the suggestion is that it's an expensive way to save not very much time compared to other options.

That's a much more succinct version. :)

Open Pros aren't box rims though :S

They're pretty damn close though. Only difference is the beveled edges.
I wonder what the tests used as their box section rims?

I think the suggestion is that it's an expensive way to save not very much time compared to other options.

Of course, if the exercise is just to find a 'scientific' excuse to buy Deep Vs for the bling, then have at it.

I see what you're saying, but I actually need a set of wheels. My Pompino is my commuter/hack bike which has a set of wheels obviously. My other bike (which will be the TT/Summer road bike) has no wheels, hence I need to get some built up. For the relatively little difference in GN between rims, I was looking to get the best option for my intended usage.

Thanks to all for the input

Peace

Kurt

They're pretty damn close though. Only difference is the beveled edges.
I wonder what the tests used as their box section rims?

The bevel is in the detail.

The Bevel has the best tunes

Bevel worship

stuck between the bevel and the deep blue V

Better the bevel you know.

She's just a bevel woman (with evil on her mind).

The bevel in me

did you ever dance with the bevel in the pale moonlight?

Thought I saw an angle or a bevel in the night :)

^^hah!

When you can fill this bucket with your own vomit (from turbo sessions, not binge drinking) then I'll let you buy one piece of go faster kit, one!
The second piece will come when you show me you can bleed from your eyeballs doing hillsprints.

i bet i can make you vomit quicker without a bike than you can make me vomit on one :)

Really? What if I swing my bike as hard as I can into you stomach?
Bloody runners.. can never think outside the circle or square or whatever that shape is supposed to be. :P

your Specialized is so light it would barely make a dent

I have the GT for this purpose.. or Mal's Raleigh which weighs more than me.. fucking solid steel tubes or something on that thing.