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

Neil

raised my saddle and did a 10 mile TT

set new power pb from 5:35mins all the way to 29:50 (included warm down)

oops.

Bit of an offtopic semi dredge from UTFS I just did after chatting to a few mates...

@hippy did you get an answer from 4 months ago on who is using infocrank? Mate of mine at a sports institute here in Aus reckons all his athletes are using them atm and that they're decent.

On the topic of p2m another guy reckons to avoid as they're sensitive to chainring wear? Doesn't make sense as it's spider based?

And to follow on, anyone using infocrank? Anyone can provide insight on p2m vs quarq elsa that I haven't read on dcrainmaker?

Edit: and for spiders...if I'd get a 110bcd to suit my current 52/36 setup, can I use some sort of adapter to bring it up to 53/39 (or even higher for TTs)? Does it skew the powaa readings at all?

I don't know anyone using them other than Magnus Bakstedt who's their pro rep or something.

How exactly will (presumably even) chainring wear change the power values?

No chance of that. I'm 69kg and 6'1". Friend is 6'3" and around 75kg... and recovers like the 7 years younger bastard he is.

if I'd get a 110bcd to suit my current 52/36 setup, can I use some sort of adapter to bring it up to 53/39

You can get 53/39 and 54/42 or 55/42 ring sets for 110mm/4-bolt (6800/9000 pattern), and even bigger rings for 110mm 5-bolt. No adaptor required.

cheapest place to buy a 13t powertap track sprocket?

The US. Or thereabouts. But @Doctor_Cake is at least in the vicinity at the moment, and might be able to grab one for you from Toronto.

If not the US as Howard suggests, HubJub.

http://hubjub.co.uk/index.php/store/cogs-sprockets/white-ind-cog-detail

Edit: ohhhh thanks :)

Yeah, I was trying to figure that out too. As if P2M is affected by chainring (or chain??) wear then quarq and other crank based would be too. I'll have to ask him again next time I see him.

Edit: and looking at infocrank looks like you need to use Praxis' M30 BB regardless if you have BSA, BB30 or anything else. I don't think I feel ok with that, I wonder if you can replace the bearings (6806) yourself in the cups they provide.

Ah awesome, cheese tester.

Does anyone have any experience with the rotor power LT or the new Inpower? Thinking of changing from my stages to one

Still a left sided power meter, no point. New cheap Quarq or P2M.

Powertap track users - what's the deal with calibrating it with a Garmin 800? What kind of numbers should I expect? I know a 501ish number is usual with the normal powertaps - but what I'm getting is way off that.. There seems to be eff all information about track powertaps on the internet..

I thought 500-540 was the accepted range? Mine hovers around 405, seems to be lower when it's cold.

Mine is currently reading -12559... Looks like I will be returning it.

Could that be the serial number or something? I'm getting ok torque readings

Could that be the serial number or something?

Yep. IIRC they don't report the offset, or Garmin doesn't display it. One or the other.

Yep, on the older track models the calibration number is the unit number. Mine is always -6209 on the Brompton.

Ah. That's annoying. How do I tell if its duff or not?

If it's close enough to what you think it should say, but doubt remains I can lend you some vectors to stick on the same bike?

Ugh. Not very scientific. I can use my stages to verify if necessary thanks Neil.

The only thing which doesn't add up is that when I go to 'sensor details' on my Garmin it gives me 5000 as the the unit ID.. Is that not the serial number?

If you've got an ANT+ stick is there not some Saris software you could download (Poweragent?) to interrogate the Powertap and confirm/deny these things?