Originally Posted by
TrojanHorse
Stages is a good option and won't require new wheels or a whole new crank.
Power2Max looks interesting if your crank is already compatible.
iNewton is also intriguing. Lots of doubters out there but the results seem perfectly accurate. Of course, at that price you may as well get a strain gauge based meter.
PowerTap is a nice option too if you feel like either building up a new or buying a new rear wheel. Prices have plummeted in the last two years.
The kind of bad thing about the powertap for me anyway is the Bike I am getting first is a 9 speed with disk brakes, the next upgrade will probably be 11 speed 105 or even Taigra (coming) depending on how much I love the new ride whether I get 1 or two years out of it before I upgrade.
The 11 speed to 9 speed part (use an 11 speed hub now with a 9 speed rear setup) may just be a spacer ??...but the disk brakes and whether that would all translate over makes it more complex :-).
Decisions decisions :-).....I love data though, and wind is a factor that hoses a lot of the other data, the power meter in the wind brings back data that really means something :-).
Bill