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The weight difference seems relatively minor to me, perhaps 100gr which I won't miss if racing (tub wheels will get me below 6.8kg anyway) ... so is there any difference in what the two meters can display / record / push out in terms of data? SRM would be with PC7 whereas the P2max would be likely to be on a garmin500.
Will be using principally for training & using my limited time as well as possible.
I don't really want to spend on the srm unless its going to have definite benefits so wanted to ask the question of ppl that have experience or used both.
Lastly - I can get either Rotor 3D or 3D+ .. for a 75kg rider will you notice the difference?
Chiva wrote: Everyone says the P2max is accurate, etc, just can't change the slope which for many people that are hard-core is a deal breaker. Hope this helps.
I don't think everyone says the P2M is accurate.
Here is an on-the-road comparison between a PT and the P2M. The PT is in black, the P2M in red.
Here is an on-the-rollers comparison between the same PT (black) and P2M (red):
And a zoomed-in view on the difference from the roller test:
At my suggestion, the rider swapped out and carefully reinstalled with new chainrings--however, for this test he'd loaned out his PT so this plot only shows the P2M. (I should have shown the plot in red rather than black, sorry).
What you'll see with the last plot is that the "drift" of the P2M power readings appears smaller than before but still present. I concluded that the P2M can be sensitive to proper installation but that, even so, some drift still occurs.
My flatmate has a Dura Ace 7800 Wired SRM so I might do a roller test using the Powertap on his bike to see what the differences are.
I think the posts above are interesting. But no power meter is perfect even the SRM. The real issue is whether the P2Max readings are stable over time, and that's not clear, and I'm not sure it ever will be.
Personally I'm holding off for Metrigear, but if you're desperate for Power I would personally get an old SRM or a Powertap with one of the later properly sealed hubs and sell it later at a £50 loss or something. Go for the SRM as it's much more pro.
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