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

Oh yeah - sorry I didn't mean the notification thing. I meant the ftp thing - had it on by accident then.

I think it's a YMMV thang. TP seems to produce reasonable numbers for me, and doesn't get fazed by my feeble sprinting efforts at the velodrome. Mind you, I don't do standing starts (the other 20+ people using the track at the same time would get grumpy if I tried, I think) which might be the difference.

Sorry if this has been covered, but, regarding TrainerRoad... when you have a powermeter (as opposed to virtual power), is this read by the workouts? Or are you still working to their estimated power?

I presume that the software reads your proper power from your powermeter vian Ant+, and all the workouts are based on that?

Yep

My best peak power numbers always come from standing starts, by some margin. I can produce ~400w more from one than I can in say, something like a flying 200m. It's bound to skew things a bit.

The former. Your ant+ reciever will pick up the PM and bingo!

Thanks @amey and @croft. Will be interesting to see how accurate their Virtual Power is

I just get the notifications.

They're like a nice little pat on the back. They are usually pretty good too. But I like to set my FTP manually. Especially given indoor/outdoor differences.

You may need to turn off the virtual power in the 'devices' settings. Although mine still looks for my PM. So I guess it may default to ant+ power.

When I was using a powercal belt as HR monitor it seemed to stay set to use virtual power. But that was a fair few updates ago.

Also trainingwith vvirtual power and training with a PM feel different.

Basically, with virtual power, all the power used to spin up the rear wheel and fflywheel is ignored as only wheel speed matters. But then when you stop pushing. You get that power back as everything spins down.

With a PM it's instant.

I weirdly prefer the feel of using virtual power. But use my PM whenever possible for cconsistency.

how often does everyone do threshold testing?

I haven't done one since the first week of November and have been training pretty consistently since then..

Every couple of months? Don't think regular CP20 testing is a good idea, and you should get a general idea of progress from your training numbers.

Might be old news - P2M are no longer manufacturing the "classic".

yeah - that's why they have been reduced for the last couple of months

And now what I wanted has gone out of stock FOREVER.

.

Jumping back a few pages, my Powertap's splined cog did manage to loosen itself in 6 weeks/500 miles so if you've got one, do check it.

How? Clearly not using a grafixbyjorj lockring.

Whatever one Paligap provided for the splined cog, someone mentioned them coming loose with lots of back pedalling, perhaps true? It was torque wrenched on too

Backlash in the spline will tend to loosen the lock ring, whoever made it. That's why cassette lock rings have that serrated face and crush washer.

Anyone got a pair of Vectors which they'd like to exchange for an SRM for a week?

Specifically the 19th to the 26th.

Apparently with vectors and the latest garmin update you can get all sorts of confusing data. Including whether you are out of the saddle.

Mind blown.

I just want something easier to fit into a suitcase than a Powertap rear wheel.

If you just want to measure work-done why not just this?

It's related too, but not directly analogous - given different levels of fitness 175bpm can be 270 watts or 330.

So whilst HR will tell you how hard your CV system is working, it won't tell you how much power you are putting out, or rather it will but only in fairly general terms.

I do have a PowerCal which essentially derives power from HR, and it tends to be fairly accurate for average power (fairly meaning out by 10-20 watts) over a long ride, but it's particular weakness is short duration power (for e.g. climbing in the Rockies next week) which it tends to hugely inflate - 2,700 watts when you are putting out 850 say, as it's done mainly on HR variability (AFAIK) which "rewards" sudden surges in HR with a massive power figure.

If I can't sort anything else out I'll use it, I'd simply prefer to use something more accurate.