HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Articles FAQ Contact About




Post new topic Reply to topic  [ 11 posts ] 
Author Message
PostPosted: Fri Sep 07, 2012 9:08 pm 
Offline

Joined: Sun May 10, 2009 1:44 am
Posts: 134
Recently purchased a power2max power meter with rotor 3d+ cranks. After doing a couple of TTs some friends asked me about the figures and told my that my avg watt seemed low. Now I can't say for sure because I've never done any testing in a lab or such to get exact figures but I still wanted to ask just to get some input. May it be that my cranks are badly mounted which makes me get "low" readings?

What I have to show is a intervall session I did on my kurt kinetic road machine. And the numbers are taken from the power2max crank and calculated data using a plugin to ST3 called trainer power (by mechgt) with the resistance curve for my trainer. Supposedly the kurt kinetic road machine should give reliable power numbers.

Power2max:
Image

St3-plugin:
Image


Top
 Profile  
 
Posted: Fri Sep 07, 2012 9:08 pm 


Top
  
 
PostPosted: Fri Sep 07, 2012 11:57 pm 
Offline

Joined: Sun Nov 13, 2011 6:00 am
Posts: 235
Well, first off tell us a bit more. Weight. Height. Age. It all changes the definition of "low". Look around the Training Peaks blog it has some good information about what the pros put out and there is a chart somewhere that shows w/kg required for certain amounts of time in different levels of the sport, ie pros can do x w/kg for 1,2,5,20,60etc mins vs cat 1 recreational rider etc. Someone will have a link. I cant seem to find it on my phone.


Top
 Profile  
 
PostPosted: Sat Sep 08, 2012 5:16 am 
Offline
Shop Owner

Joined: Sat Jun 13, 2009 4:02 am
Posts: 1965
Location: NoVA/DC
kinetic has a cheap computer with a reading that gives you power numbers based on its trainer's speed (it basically knows the force required to turn the resistance unit). you can get it and compare to at least see if youre in the ballpark. or borrow someone's powertap hub


Top
 Profile  
 
PostPosted: Sat Sep 08, 2012 9:32 am 
Offline
Administrator
User avatar

Joined: Sat Jun 19, 2004 11:08 am
Posts: 6221
Location: Urbana, Illinois
Can you borrow another powermeter to compare your readings. If you look at this thread:

viewtopic.php?f=8&t=102562

You will find for mortals big numbers are not necessarily something you can achieve. While I could post bigger numbers if I had a power meter on my ride bike I don't and won't since I don't race it ever. To determine if your numbers are low it takes many factors. Age, height, level of fitness, well rested, training program or are you overtrained?

_________________
-For my next trick I will set myself on fire!
-This board and the world in general would be a much nicer place if everyone could just take themselves a little less seriously.
-Sticky Fingers John Rockefeller
-First one over the cliff wins!


Top
 Profile  
 
PostPosted: Sat Sep 08, 2012 6:23 pm 
Offline

Joined: Thu Dec 29, 2011 11:22 pm
Posts: 261
are your numbers consistent? that is a lot more important than the actual number you get


Top
 Profile  
 
PostPosted: Sat Sep 08, 2012 6:29 pm 
Offline

Joined: Sun May 10, 2009 1:44 am
Posts: 134
I'm 85kgs (187lbs), 193cm (6.3 feet and inches), 27 years old.

Haven't had the p2m cranks for that long but I have some data from an actual TT-race which was run on a fairly flat circuit of two laps.

Distance: 33,59 km
Climb: +113,9 / -122,4
Time: 45:51
Avg speed: 44,0 km/h
Avg power: 324,4
Weather conditions: Min./Max.: 16,4 °C/17,0 °C; Pressure: 1015,1 mbar; Humidity: 91,2%; Dew point: 15,2 °C; Wind Speed: 6,7 km/h; Precipitation: 0,0mm

What I'm aiming for is to find out if I can't trust the numbers (don't know how daft it seems or is not trusting a power2max power meter). I'm afraid I can't borrow another power meter this is what I have. The numbers generated for the kurt kinetic is with the resistance curve from kurt kinetic them selves. And is claimed to be accurate and "matched" with a powertap.


Top
 Profile  
 
PostPosted: Sat Sep 08, 2012 11:15 pm 
Offline

Joined: Thu Dec 29, 2011 11:22 pm
Posts: 261
i also have a kurt kinetic trainer. i don't think their power curve is very accurate, or it never was for me and i don't worry about it now i have a power meter anyway.
are you doing the spin down test to calibrate the turbo before you use it and do you set the tyre pressure the same every time

anyway - 324 watts is a good power output, if thats noticeably low then :thumbup:
and 44km/h seems like good going as well but your speed would depend on conditions and how aero you are.
here is a thread I've been looking at recently with some testers power outputs on http://www.timetriallingforum.co.uk/ind ... opic=70736


Top
 Profile  
 
PostPosted: Sun Sep 09, 2012 1:56 am 
Offline

Joined: Sun May 10, 2009 1:44 am
Posts: 134
The link you posted, I don't understand "What average power did you need to break 20 minutes?" break what?


Top
 Profile  
 
PostPosted: Sun Sep 09, 2012 2:18 am 
Offline

Joined: Wed Dec 15, 2004 10:54 am
Posts: 1396
Location: Melbourne, Australia
Popular TT distance in the UK is 10 miles. Reference is power to beat 20 minutes for this distance...

_________________
http://climbinglama.blogspot.com.au


Top
 Profile  
 
PostPosted: Sun Sep 09, 2012 6:27 am 
Offline

Joined: Thu Dec 29, 2011 11:22 pm
Posts: 261
indeed. its a 10 mile tt so 20 minutes is 30mph.
but there are a lot of power figures posted for other times too.

your 44km/h is 27.34mph so would be a time of 21:58 in a 10. just trying to give some idea of other riders outputs


Top
 Profile  
 
Posted: Sun Sep 09, 2012 6:27 am 


Top
  
 
PostPosted: Sun Sep 09, 2012 9:05 pm 
Offline

Joined: Wed Mar 28, 2007 12:49 pm
Posts: 1579
Location: Near Horgen, Switzerland
+1 regarding the trainer data. I know from experience that the wheels, tyres, setup and so on can make a big diffrence to how the trainer rides.

At the end of the day it does not matter what power number you hit, as power numbers don't win races. Instead you just need to be reasonably sure that the power meter produces a consistent measuremtn, and that the numers move upwards. So you might try riding the same circuit every month and noting the wind and time. If the power numbers go up and the time comes down then you are doing something right.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 11 posts ] 


Who is online

Users browsing this forum: Google [Bot] and 7 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Powertap readings - impact on weight of shoes!

in Training

Milese

4

636

Sat Apr 12, 2014 2:17 pm

kevinkalis View the latest post

There are no new unread posts for this topic. Roof mounted car racks

in Cycle Chat

Devon

13

703

Wed Dec 04, 2013 10:11 pm

thp View the latest post

There are no new unread posts for this topic. stages or power2max?

in Road

davidalone

9

2412

Wed May 21, 2014 3:51 pm

JensW View the latest post

There are no new unread posts for this topic. What's the deal with forward mounted fork sensors?

in Cycle Chat

seanblurr

9

770

Wed Jan 22, 2014 6:36 am

eric View the latest post

There are no new unread posts for this topic. Dura Ace 7900 11-23t cassette - Mounted but never ridden

in For sale - Pictures are mandatory 22-3-13

BikeNerd2453

0

75

Fri Aug 22, 2014 8:52 pm

BikeNerd2453 View the latest post


It is currently Tue Sep 16, 2014 2:32 pm

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB