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PostPosted: Wed Aug 08, 2012 5:22 pm 
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Joined: Mon Jul 16, 2007 10:17 am
Posts: 609
Location: Latvia
I decided to get a Power2Max powermeter, but I want to choose between S-works or Lightning crank. Both are compatible, but I have no experience with them in use and Specialized doesn't list actual weight of crankarms.
I would like to know if Lightning are worth extra price and what is the weight penalty of S-works.

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PostPosted: Wed Aug 08, 2012 6:34 pm 
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Joined: Wed Sep 26, 2007 1:57 pm
Posts: 7871
Location: San Francisco, CA
More to the point, has anyone seen data indicating the Power2Max is accurate?

I was worried by Jeff Jones' test.

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PostPosted: Wed Aug 08, 2012 7:34 pm 
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Joined: Tue Jul 18, 2006 5:18 am
Posts: 688
Location: Cambridge, New Zealand
Attached is the accuracy profile of my one. At least it is consistent side to side as the one it replaced (they were very quick with a warranty) had a 2% difference when in the big dog (and was over reading by more).

I observed variation in accuracy (as I tested many times) on different occasions although part of that will be the granularity of the calibration figures.


Attachments:
P2M.JPG
P2M.JPG [ 42.95 KiB | Viewed 1173 times ]

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PostPosted: Thu Aug 09, 2012 5:17 am 
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Joined: Sat Jun 13, 2009 4:02 am
Posts: 1980
Location: NoVA/DC
im assuming you have a bb30 frame...


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PostPosted: Thu Aug 09, 2012 11:07 am 
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Joined: Mon Jul 16, 2007 10:17 am
Posts: 609
Location: Latvia
It will be used for Specialized Transition with OS BB that I guess is a bb30 compatible, but I also would like to use it on my Scott CR1 Team Issue with bb adapter.

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PostPosted: Fri Aug 10, 2012 1:48 am 
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Joined: Sat Jun 13, 2009 4:02 am
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Location: NoVA/DC
well that pretty much answers the question for you. if you want to use it on a non-bb30 frame (your cr1), it has to be the lightning.


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