some fairly in=depth reviews on power2max reviews exist here:


http://www.dcrainmaker.com/2013/01/power2max-power-meter-in-depth-review.html

http://jibbering.com/sports/power2max-review.html


the rotor power meter is fairly new, so havent seen any reviews yet.

Thanks. I've read those reviews, but was hoping to hear some STers experiences with those 2 or any other non hub based, Ant + PM's.

If that is your only criteria then buy a Quarq. Reliable, durable and some of the best customer support in the industry.

I really liked my quarq, but I recenly upgraded my bike and it has a bbright bottom bracket and an rotor crank with an aero chainring. I'd like to keep that set up if possible. My old Quarq was a gpx, so I sold it as I didnt want to use an adapter.

S975 BB30 Quarq. No adapters. Mount Rotor Aero Rings, or as this guy did Rotor Aero Q-Rings.
http://forum.slowtwitch.com/...orum_view_collapsed;


http://bbright.net/supportingbrands.aspx

To more answer your question, I would stay away from both of those options until its been proven that they are accurate. Read the Wattage Google Group, they have had many discussions about the P2M. The rotor is so new I dont know anyone who uses one.

Thanks. I'll check out the power group.

I have a P2M mounted to a Rotor 3D+. My interest in it was primarily to move to shorter crank arms. I have had the unit on my DA since November and have used it almost exclusively indoors on my Lemond. Not exactly sure what you are looking for outside of what Ray put in his review, but I have had zero issues in terms of reliability with the P2M. The drift issue that early units had has been solved and the powerbalance metric is an interesting one to look at. It is about as heavy as PMs get but on the TT bike that matters little to me. I think Ray did a pretty good job in his review and I have been happy with my experience so far.

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Thanks, that's exactly what I wanted to hear. I have a P5 with a 3d+ crank and an aero ring. P2M showed me how to cut out the chainring to fit the power meter and that does make me a little nervous, although still interested. Thanks again.

I take it you are interested in the 110BCD version? Though I had 110 rings I, didn't want to fiddle with them not working even though Michael thought they might work. The battery cover did need some sanding to ensure proper clearance but other than that install was straight forward.

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Yes it is a 110 and Michael sent me photos of the the chainring he cut out. He say that there is plenty of metal on the aero ring and that he put up to 1500 watts on his during sprints. That said, P2M doesn't recommend altering the chainring... naturally. My thinking is if I'm going to buy new chainrings, I might as well just spend a little extra money and go with the Quarq.

i've a rotor(srm base) and it works good

I have a p2max with almost a year on my tt bike, rotor 3d crank. No issues. I don't have the temp. compensation upgrade but it has not been a problem. Several of my friends have them as well and again no problems to report.

Thanks so much for all the feedback!

Here's what it looks like on my P5. Haven't had any issues with it. Bolted right on.

http://forum.slowtwitch.com/..._reply;so=ASC;mh=25;

Echoing what other P2M users have said here. I've had mine since December. It is mounted on a Rotor 3D crank. Did the install myself and have been riding it consistently since then with zero issues. I'm happy with the choice and the extra C-bills in my wallet.

i use the p2m and have found it fantastic. dm me and i can put you in touch with a discount

Hi Steve,
So you cut out the chainring to fit the P2M? If yes, how did you do it?BTW, Your bike looks great!
Thanks,
Rick

Hi James,
Thanks so much for the Feedback.
Rick

Thanks for the feedback. What type of chainrings did you have on your Rotor 3D?

Rick, thanks. No didn't have to cut anything. All that was needed was to file down the chain catcher at the battery cover (the underside of the triangular piece, at the point) so it would sit flush against the aero chainring. It's explained in detail in the manual. Otherwise, it fit right in. That was the main reason I went with P2M. Didn't need any adapter or such.

Steve

I moved the chainrings from my compact FSA Gossamer crank over to the Rotor, which was also easy.

My shop got our first Rotor power meter last week and our tech installed it on my road bike yesterday.
Next ride is scheduled for Friday so I'll have some feedback for you then.

I'm waiting for a p2max to arrive right now (UPS says it takes 5 days from Germany to England, hell, I think a slowtwitch reader could cycle it to me faster) and will be installing next week on a 52/36. Week after that I'll be in Portugal on a bike heavy training camp with a powertap rear, so I'll see if I can set up a pair of head units and post the data. Should be about 20 hours worth of sprints / climbs / intervals.

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Twitter: @tripigeon Blog: Ironpigeon.com
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I have the Power2Max (new version with temperature compensation) built on Rotor 3D crankset.

I don't have anything to compare it with so am very happy.
I have about 40 hours (trainer use only) on it so far and have never seen a power or cadence drop off.

Feel free to PM me if you have specific questions.

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