Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Training & Nutrition Learn how to develop a training schedule that's good for you. What should you eat and drink on your ride? Learn everything you need to know about training and nutrition here.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-10-10, 11:43 AM   #1
cappuccino911
Banned.
Thread Starter
 
Join Date: Aug 2010
Bikes:
Posts: 732
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Trainers with power

Anyone have experience with trainers with power? the kurt kinetic trainers ahve an optional piece for $80 that gives you power readings. Anyone know if it's accurate enough to be used for power training purposes?

Nashbar also has the "Watt Master" trainer that includes power readings and they also have another model on their site that supposedly provides power outputs. I'm not looking for anything perfect, but just want to do some basic tests more so than anything (power at threshold, for example)

Need to buy a triner because my gf is having her knee scoped and she'll be riding it for therapy so I figure since i want to get more serious with training during the winter may as well invest a little more in the power features if they are useful.
cappuccino911 is offline   Reply With Quote
Old 10-10-10, 04:41 PM   #2
Malloric
Senior Member
 
Join Date: Aug 2010
Bikes:
Posts: 182
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yes and no. They don't measure power at all, they measure speed and then use a formula to calculate the power a hypothetical average rider would use to sustain that speed on the road. The formula is pretty consistent over the relatively narrow range you use in threshold training. So, if it underestimates your FTP by 10% at FTP effort it will be very close to underestimating it by 10% at 80% of FTP effort. So, you just use the number it thinks is your FTP and train away.

That said, it's really a waste of money. The formula is available on Kurt Kinetics website. The watt display is instantaneous only, it won't record your work out like a cyclometer will. Just get a cyclometer (if you don't have one) and then use the formula on the Kurt Kinetic website to determine what speed to do your intervals at ahead of time.
Malloric is offline   Reply With Quote
Old 10-11-10, 07:46 AM   #3
simonaway427
Senior Member
 
Join Date: Apr 2010
Location: Fredericton, NB, Canada
Bikes: 2010 S1, 2011 F75X
Posts: 1,430
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I just made an excel spreadsheet using Kurt Kinetic's formula. Taped it to my wall next to my trainer setup. Using my cyclo-computer, I just glance at the chart based on the speed I'm doing to tell me my wattage.
simonaway427 is offline   Reply With Quote
Old 10-17-10, 07:10 AM   #4
MrMojoJoJo
Group Rides are Fun
 
Join Date: Jun 2008
Location: NY
Bikes: 2007 Trek 3900
Posts: 92
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You really don't even need to bother trying to convert speed to watts... If a hard 20 min interval is 20mph then just do 20mph intervals.

Most of the time the resistance from trainer to trainer will not be the same, or at least not close enough to get a real power reading.

For example Cyclops posted that their Fluid2 Trainers are "ride tuned" 400 watts @ 25mph.

On the one I have this is not true. ~22.5mph is 400 watts. Cyclops Fluid 2 Review
MrMojoJoJo is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 04:19 PM.