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I do agree, that if not switching between bikes, you can probably get a "better" device that is crank based for the money. I know for my road bike, I sacrificed weight to go with the pedals. If I was buying just for that bike, I would have gone a different direction.
- Lower cost (PT hub, single-sided crank, single-sided pedals, chain rings, some spiders)
- Total power (spiders, hub, dual-sided pedals, dual-sided crank arms)
- Dual-sided power (dual-sided cranks, dual-sided pedals)
- Move between bikes (pedals, hub, maybe cranks if compatible)
I love Garmin, and I have lots of Garmin stuff. But, I would not get the current crop of Vector 2 pedals. I have the PowerTap P1 pedals, and I would buy them again if they died. No brainer.
If you need to move the PM between bikes, then the Quarq is not a great choice. However, if you do not need to move between bikes, then the Quarq is a great choice. The only major difference in function between pedals and crank PM is that a crank PM estimates left & right power. Both give you total power.
As a broad generalization, accuracy between the major brand PMs is not a differentiator. Some will argue that SRM is the gold standard for accuracy, but after you get past that specific religious debate, the rest are all generally considered the same in the marketplace.
I know a lot of people with quarqs. They all love them, but they have all had to warranty them at least once. Maybe the new dzero units are better, but I'm not willing to take that chance. I don't know anyone with a power2max that has had a single issue.
Also, here is a good resource for some basic power meter info:
Vector Cycle Works
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P1's don't. And if you are switching between bikes, you will always use the same cleats. Plus, you "could" use keo cleats if you wanted to. They do work.
Yea, Garmin Vectors are the only ones that need a torque wrench (both the PowerTaps and Faveros install just like a normal set of pedals). Most people report a tiny bit of play when using Look Keo original cleats with the P1s...but awesome if it works for you.
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I'd probably lean quarq if one bike, but p1s if two. Or a power tap wheel if I just rode my race wheels all the time (even on trainer).
P1 are the best i have ever bought. Can switch them between every bike in less than 5 mins
Can not do that with the cranks or hub as i have threaded to different standards and i have QR and thru axles on different bikes but i can use p1 on all