yes, but unless you're using a power meter for stuff like field aero testing or some odd circumstance (like MTB with tons of switchbacks on steep, heavily tree-covered terrain), the differences are negligible.


it's fine if it fits on your fork. that said, gluing a small magnet to the surface of the disc (or inside the valve hole cutout) works fine for the disc.

The advantage of a speed sensor is that it updates much faster than a GPS. Accuracy isn't really that different (and can be worse if you have the wheel size measured inexactly).

The garmin hub unit should work on either wheel, and yes there is a slight aero penalty.

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ECMGN Therapy Silicon Valley:
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Heh, I just posted about this to a thread on field testing. I just tried using a front hub speed sensor for that over the weekend and liked it a lot. Messing with gluing magnets and making sure things line up is a morass that I'm glad to be done with. That being said, I plan to use the speed sensor only for aero testing; it will come off for any race (one advantage is how easy it mounts and unmounts).