not to be confused with the iPod, the iRaq or the iRan.
this computer uses sensors located at the front of the unit to measure wind speed and ties in with elevation and grade to calculate wattage.
this product is now in it's second generation and is available now in a wireless setup.
price tag was hefty - over 600 retail, but is an option for the mountain bikers out there.
still very un-impressed overall at the lack of consideration of the "wattage market" to the entire mountain bike market. wattage info comes with a price (as you have to buy a TON of stuff to get anything to work worth a damn) and the power tap unit actually seems like it would be the solution - they just need to build it in a disc hub.