Power Meters / Powermeters (SRM, Powertap, Quarq, Ergomo, Vector, Stages, power2max, P2M, 4iii, InPower, Cinch)

Hmm. I don't want a Quarq.

FWIW.

I've sourced a 180mm rotor for the PowerTap G3. So I shall be putting a powermeter on a silly heavy trail bike.

Booyaa!

Why not?

Sram Red SRM

Hmm. I don't want a Quarq.

He didn't say Quarq, he said Force22

If you don't like the force22 branding, you can get the s900 crankset which has the same crank arms as the force and also the "s975" that the quarq and srm use. @6pt uses them with his p2m.

https://www.sram.com/sram/road/products/s-900-crankset

how about the new rotor inpower? the price @ starbike seems very competitive

Left only

I own an SRM, I've owned several more, and I just don't see what justifies the cost these days.

Valid argument, but it would be the best match for Etap

"Proper" left/right data from my Pioneer this morning:

isn't p2m also one sided?

Measures the strain between the axle and the chainring, so it's taking the net force of both legs, rather than measuring the deflection in the left hand crank (or crank/axle) and doubling that figure.

You can see from the table I just posted that if you doubled my left leg power you'd under-read by 10%, conversely if you doubled the right leg it'd be 10% high.

I've always found that L/R at low power is out, and probably not of any importance. Start putting out something near threshold and you will probably even out.

Do you push away from traffic lights with your right leg?
Do an effort or 2 or just take a clip of some steady riding and it'll be near even i'd think.

Maybe I've written it before, but our legs are never the same length. An even biomechanical 50/50 is utopia land.

I need some advice...I'm getting closer to jumping into PM land. Atm these are my options...

-S900 crank with P2M or Quarq Elsa (will a P2M bit a GXP S900?)
-Pioneer
-Infocrank

Pioneer and Infocrank will set me back around the same amount of money, and is true L/R. S900 combo will set me back about AUD500 less, and the P2M batteries are hard to find in Australia I think, unless you order a bunch from P2M AU.

What do you guys recommend? I recall Hunter Allen seeming to emphasise the need for true L/R PMs??

@Howard- I do still have one- its brand new, and I'd like £420 for it.
(SRAM rival, 53/39, 172.5mm, GXP)

Just use an inner tube

Just tried this on my powertap, and it worked! cheers

The P2M will fit a GXP S900. I've no experience of the Elsa, but I have got a couple of Rikens. One died and had to go back to Mr. Quarq to be fixed, but this was reasonably stress-free and was for free as it was inside the 2 year warranty period. However, my P2Ms have always just worked, and so that puts them ahead in my books.

I've no experience of the Pioneer or Infocrank, but I'm sceptical about the need for L/R balance data. Just not sure what you'd actually do with the data. My P2Ms give estimated L/R balance, but I've never really used it.

Buy a P2M. It'x the perfect tool for an everyday user.

If you're worried about batteries, order 5 from P2M when you buy it. But in the new S-type, you can use any brand. It was a battery tray size tolerance issue, that was sorted.

Still need to get those Raltecs to you

I emailed to cancel my powertap.

But too late. It's at the post office.

If I get my hands on it, that's it, basically.

Just have to build a bike around it.....

Give it to me and I'll pop it on my XC bike where it actually makes a bit of sense ;)

DC Rainmaker raising a massive red flag over the Limits power meter

Oof!

Kickstarter PM in being shit shocker