Here's a quick guide on how to use this section. There are a whole bunch of numbers listed for each wheel, which I've tried to explain below. In a nutshell, lower is better for all parameters. If you'd like me to clarify the meaning of some of these numbers or debate them for that matter, just write me an email or post something to the forums.
a, b: These parameters are a measure of the bearing performance. As these numbers increase, so will the drag due to bearing friction. Conceivably, these numbers could be lowered for any wheel by using high quality bearings and ensuring that they are well aligned and adjusted.
c: This component is solely due to aerodynamic drag and is a product of the wheel design. Since the power lost due to aerodynamic drag increases with w 3, it's important to get this right.
I: The moment of inertia is really only important during accelerations. This parameter has absolutely no effect when travelling at a constant speed, even uphill.
P: The power required to keep a wheel moving at a constant speed is equal to the losses due to parameters a, b, and c. This is a very important performance characteristic. P30=power needed to keep the wheel at 30 km/h
|Shimano||7801-SL||2007||1.8x10-3||4.81x10-4||1.80x10-5||0.034||0.62||1.25||2.19||Thin aero spokes, a light rim and good bearings make Dura Ace an unbeatable wheel. Very nice.|
|Shimano||WH-6600||2007||8.8x10-3||3.60x10-4||2.46x10-5||0.038||0.82||1.59||2.74||A very good wheel. Ultegra is Dura Ace's little brother in every respect. Just a little heavier and less aerodynamic.|
|Mavic||Ksyrium ES||2006||13.4x10-3||0.99x10-4||4.33x10-5||0.039||1.07||2.14||3.82||Light. Beautiful. Well built. But... big fat aluminum spokes aren't aerodynamic.|
|Shimano||WH-540||2003||13.6x10-3||4.78x10-4||1.49x10-5||0.039||0.87||1.52||2.45||Slap some decent bearings in there and it's a winner!|
|Mavic||Ksyrium Elite||2006||8.95x10-3||5.42x10-4||2.43x10-5||0.043||0.93||1.78||3.04||There is some drag in the bearings. The aerodynamics and MoI are excellent.|
|Campagnolo||Scirocco||2004||6.22x10-3||3.50x10-4||3.53x10-5||0.056||0.92||1.89||3.39||The dust cover over the bearings caused some friction.|
|Kult||ProMotion||2005||1.10x10-3||2.06x10-4||2.43x10-5||0.039||0.53||1.15||2.14||Very light rim. Great aerodynamics. Some durability issues.|
|custom||-||-||2.46x10-3||9.64x10-4||4.23x10-5||0.060||1.31||2.69||4.79||Alex DA22 rim with Shimano 105 SC hub and 15Ga spokes laced 3x|
|Neuvation||M28 Aero||2005||0.77x10-3||1.49x10-4||3.62x10-5||0.052||0.67||1.52||2.88||Smooth bearings. Decent weight. Good Aerodynamics.|
|Shimano||7801-SL||2007||6.53x10-3||6.53x10-4||2.19x10-5||0.036||0.91||1.74||2.96||Excellent aerodynamics and low moment of inertia make this a wheel to own. The bearings could use some tweaking though.|
|Shimano||WH-6600||2007||20.4x10-3||13.8x10-4||2.85x10-5||0.063||1.81||3.25||5.27||The bearings are obviously not adjusted properly, causing excessive drag. It is also distorting the MOI calculation. Good aerodynamics, but this test should be done again.|
|Mavic||Ksyrium ES||2006||5.27x10-3||3.60x10-4||3.45x10-5||0.043||0.89||1.84||3.31||Better aerodynamics than the front wheel, but still not good. A truly beautiful wheel.|
|Shimano||WH-540||2003||9.42x10-3||2.14x10-4||2.36x10-5||0.046||0.73||1.41||2.45||Bad bearings and some heaviness are killing this great set of wheels.|
|Kult||ProMotion||2005||0.63x10-3||2.34x10-4||3.08x10-5||0.040||0.64||1.41||2.63||Very light rim. Great aerodynamics. Some durability issues.|
|Mavic||Ksyrium Elite||2006||6.03x10-3||5.26x10-4||2.58x10-5||0.049||0.88||1.72||3.00||Low MoI with amazing aerodynamics. The bearings have a bit of drag.|