531Aussie

Enjoy, then dismantle at will.

https://www.youtube.com/watch?v=i5hK7RFlRyY


https://www.youtube.com/watch?v=Y_KnP...eature=related

d8168055

MAN!!! If they had some better graphic design... i would totally buy them...

svtmike

Sweet. I can't tell you how many times I've felt that I could've won a race if my wheel bearings weren't holding me back.

Elvo

Just put motor oil in your bearings and they can spin forever too

TDRILL

Nothing says legit like a cardboard test stand

pallen

so how many miliwatts does that difference represent?

coachboyd

This is a great tool for anybody who rides their bike upside down with the wheels in the air and no weight on the bearings.

zigmeister

OMG, that is stupid. Wow, real wind tunnel testing and aerodynamics numbers they are showing there. Very scientific.

First, they have a clincher wheel with rim tape on. Hence, the holes for the spokes are covered. The tubular Zipp has the open holes exposed. Anybody can firgure out with common sense, the holes will provide serious drag.

Lastly, wheel wind tunnel tests are performed with TIRES MOUNTED. We don't ride around on the roads with no tires. Well, I don't at least. I don't even own Zipps by the way.

Gheez...

Funny thing also, they look like any other carbon rim and hub from Taiwan you can get made for $300 less from any other builder.

I'm going to email them and ask who makes their rim and hubs...should be interesting. If they even respond.

Doug5150

Something like the differences in the second video could be attributed to how tight the bearing seals are--or rather, if some are broken in, and others are brand-new. The seals tend to be rather tight on new bearings. I have seen a few expen$ive machine bearings that were super-accurate, but that felt rather sticky when brand new--just due to the new seals being tight.

If you put motor oil in them every couple weeks, that would work fine. Problem is you need to pull out one seal to do that.
Grease is a thickener with a lubricant, and the thickener itself is not a very good lube.

If you have stainless, hybrid or full-ceramic bearings, you can use powdered teflon instead of grease.
It will have less friction and last much longer than any grease, but it offers no moisture protection for non-stainless steels. So your bearings gotta be stainless or ceramic only.
And still I doubt it will make a mouse-fart's worth of difference...... But anyway.

--------

Also FYI: hybrid bearings (stainless races with ceramic balls) entail most of the useful advantages of full-ceramics, but at a much-lower price. About one-fourth what China generic full-ceramics would cost, usually.

Hybrids have lower running friction than steel or stainless-steel bearings. Their only drawback compared to full-ceramics is that hybrids don't do so well at very-high RPMs, such as 30,000+ RPMS,,,, which isn't important for bicycle use anyway.

ABI (for one example) makes hybrids specifically for bicycle use, sold through numerous retailers online.
https://www.jensonusa.com/store/produ...d+Bearing.aspx <--- hub bearings for $20 each

EdIsMe

The Zero CX weighs more than the zipp... and is a clincher so more of the weight is located at the furthest extremity of the wheel.

What you are seeing is not a more efficient wheel, but an excellent example of inertia and conservation of energy principles.

AdelaaR

Haha ... exactly

AdelaaR

That's what I was thinking as well ... more weight with perfect distribution and at the outer edge will make it spin longer.
That and the fact they probably have used some special grease which isn't feasible in actual riding.
They might also have taken the seals out ... that would make less friction.

znomit

The campy at the end stopped with the pin at the top.
I call rigged.

rm -rf

The second video is hilarious. The Mavic stopped dead in 15 seconds! What did they do to those other wheels?

I gave an easy pull, and spun my front wheel at approximately the same starting speed as they do, then started the video. It was still spinning when the video ended. So I started 30 seconds before their start, and my wheel went at least a minute longer after the video stopped.
That's just a White Industries hub with steel bearings, and a Kinlin aluminum wheel, with tube and tire attached. The whole thing weighs 930 grams, and since it's heavier, it probably should spin longer. But give me a break.

mmmdonuts

Ve make silly tests to prove our veels are superior.

BigAura

Home spun science is fun!

CornUponCob

The same amount of energy needs to be put into each wheel for these tests to start to be accurate. Tying a weight to a string and then wrapping the string around the wheel and letting the weight fall to spin the wheel up will get you closer to putting the same energy into each wheel.

darb85

doesnt the fact that it rolls longer in wind test state that its less aero?