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 02-15-06, 07:34 PM   #1
rjtokyo
Just ride :-D
Thread Starter
 
rjtokyo's Avatar
 
Join Date: Jul 2003
Location: Tokyo
Bikes: Anchor RFX-8, Pedal Force QS-2, Bertoni Nuovitalia, Performance X-203
Posts: 572
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Calculating Power Output on a Trainer

Is there a way to calculate, or even approximate power output on a stationary trainer, like maybe a Cyclops Fluid 2, without a power meter? It seems that since you don't have any variables of rider weight, wind resistance, road slope, rolling resistance, etc., it may be possible to do based solely on a specific trainer's resistance and the gear ratio being used. On a secondary note, is there anyone in the BF community that has a PowerTap (or equivalent power meter) and say a Cyclops Fluid 2 that would be willing to measure power outputs on the trainer in different gear ratios and post the results?

I would love to get a PowerTap SL, but it's going to take a while before there's enough $ saved up for it. Thanks!

- RJ
rjtokyo is offline   Reply With Quote
Old 02-15-06, 07:36 PM   #2
GuitarWizard
Used to be a climber..
 
GuitarWizard's Avatar
 
Join Date: Aug 2005
Location: East Baldwin, ME
Bikes: 2016 Ridley Fenix SL, 2013 PedalForce RS3-ISP, 2015 Trek 520 Disc
Posts: 6,834
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If you look on the CycleOps site, I believe there is a chart that will give you approx. watts for a given cadence/gear ratio....

*EDIT* Nevermind, it's on this site:

Click me, click me

Last edited by GuitarWizard; 02-15-06 at 07:46 PM.
GuitarWizard is offline   Reply With Quote
Old 02-15-06, 08:01 PM   #3
rjtokyo
Just ride :-D
Thread Starter
 
rjtokyo's Avatar
 
Join Date: Jul 2003
Location: Tokyo
Bikes: Anchor RFX-8, Pedal Force QS-2, Bertoni Nuovitalia, Performance X-203
Posts: 572
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by GuitarWizard
If you look on the CycleOps site, I believe there is a chart that will give you approx. watts for a given cadence/gear ratio....

*EDIT* Nevermind, it's on this site:

Click me, click me
Perfect! Thanks GuitarWizard! Just what I was looking for. I'm more and more convinced that training by Power Zones is more effective than with HR.

Cheers! - RJ
rjtokyo is offline   Reply With Quote
Old 02-25-06, 09:37 PM   #4
jeffst
Junior Member
 
Join Date: May 2005
Bikes:
Posts: 23
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I don't understand this chart. The flywheel of the trainer is turned by your rear wheel. Your rear wheel turns at a speed based on cadence and gearing. Turning a 53x12 at a cadence of 60 turns the flywheel at the same speed roughly as turning a 39x15 at a cadence of 100. But the wattage charts shows 700W vs. 500W.

What am I missing?
jeffst is offline   Reply With Quote
Old 02-26-06, 04:39 AM   #5
CdCf
Videre non videri
 
Join Date: Sep 2004
Location: Gothenburg, Sweden
Bikes: 1 road bike (simple, light), 1 TT bike (could be more aero, could be lighter), 1 all-weather commuter and winter bike, 1 Monark 828E ergometer indoor bike
Posts: 3,208
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
53x12 at 60 gives about 540 W on the chart.
39x15 at 100 gives about 520 W on the chart.

What's the problem?
CdCf is offline   Reply With Quote
Old 02-26-06, 10:33 AM   #6
Greg180
Realist
 
Greg180's Avatar
 
Join Date: Jan 2006
Location: Massachusetts
Bikes: Roubaix, Tarmac, Fixed Gear
Posts: 3,083
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The link takes you to the Branford bike site...Where in that site is the chart?
Greg180 is offline   Reply With Quote
Old 11-09-06, 03:57 PM   #7
huytheskigod
Senior Member
 
huytheskigod's Avatar
 
Join Date: Jul 2005
Location: Davis, CA
Bikes: K2 Zed 3.0; Motobecane Le Champion; Pedal Force RS; IRO BFGB
Posts: 1,183
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hate to drag up an old thread but I would like to have this chart but as the previous poster stated, the link no longers points to the correct data. If anyone knows where to find similar data, it would be very useful.
huytheskigod is offline   Reply With Quote
Old 11-09-06, 04:06 PM   #8
rjtokyo
Just ride :-D
Thread Starter
 
rjtokyo's Avatar
 
Join Date: Jul 2003
Location: Tokyo
Bikes: Anchor RFX-8, Pedal Force QS-2, Bertoni Nuovitalia, Performance X-203
Posts: 572
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by huytheskigod
Hate to drag up an old thread but I would like to have this chart but as the previous poster stated, the link no longers points to the correct data. If anyone knows where to find similar data, it would be very useful.
Hey huy-

Yeah unfortunately that chart seems to have been removed. A while back I used the data from it to make up a chart of wattage output for various gear ratios and I can dig it up and post it here later. Right now I'm heading off to catch a plane for Okinawa to participate in this weekend's two-day Tour d' Okinawa, a 320km ride encirling the island . Will try to post the chart after that.

Cheers! - RJ
rjtokyo is offline   Reply With Quote
Old 11-09-06, 04:09 PM   #9
huytheskigod
Senior Member
 
huytheskigod's Avatar
 
Join Date: Jul 2005
Location: Davis, CA
Bikes: K2 Zed 3.0; Motobecane Le Champion; Pedal Force RS; IRO BFGB
Posts: 1,183
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by rjtokyo
Hey huy-

Yeah unfortunately that chart seems to have been removed. A while back I used the data from it to make up a chart of wattage output for various gear ratios and I can dig it up and post it here later. Right now I'm heading off to catch a plane for Okinawa to participate in this weekend's two-day Tour d' Okinawa, a 320km ride encirling the island . Will try to post the chart after that.

Cheers! - RJ
Thanks much! Have fun with the tour as well.
huytheskigod is offline   Reply With Quote
Old 11-10-06, 10:43 PM   #10
zimbo
Senior Member
 
zimbo's Avatar
 
Join Date: Feb 2006
Location: North Carolina
Bikes:
Posts: 2,040
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
On the CycleOps Fluid2, the power curve depends on the kind of rear tire you are using and how tightly you clamp down on it. You also need to let the unit warm up for 10-15 minutes first.

I have a PowerTap and here are my own anecdotal measurements with the CycleOps Fluid 2. I'm using a Michelin Carbon tire and I always tighten it down to spec (which for the Fluid2 is 2-and-a-half turns after the clamp touches the tire).

14 mph = 130 watts
15 mph = 145 watts
16 mph = 160 watts
17 mph = 185 watts
18 mph = 210 watts
19 mph = 235 watts
20 mph = 265 watts
21 mph = 295 watts
28 mph = 600 watts
30 mph = 700 watts

These are rough ballpark estimates and, again, these are based on tightening the clamp 2.5 full turns from the tire-touch point on Michelin Carbon tires.

--Steve
zimbo is offline   Reply With Quote
Old 09-07-08, 12:49 PM   #11
joevella
Member
 
Join Date: Aug 2006
Location: Colgan, Ontario Canada
Bikes: Leader 730R TT
Posts: 33
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
has anyone done this for a mag850 at the 7 resistance levels??

has anyone done this for a mag850 at the 7 resistance levels??

Quote:
Originally Posted by zimbo View Post
On the CycleOps Fluid2, the power curve depends on the kind of rear tire you are using and how tightly you clamp down on it. You also need to let the unit warm up for 10-15 minutes first.

I have a PowerTap and here are my own anecdotal measurements with the CycleOps Fluid 2. I'm using a Michelin Carbon tire and I always tighten it down to spec (which for the Fluid2 is 2-and-a-half turns after the clamp touches the tire).

14 mph = 130 watts
15 mph = 145 watts
16 mph = 160 watts
17 mph = 185 watts
18 mph = 210 watts
19 mph = 235 watts
20 mph = 265 watts
21 mph = 295 watts
28 mph = 600 watts
30 mph = 700 watts

These are rough ballpark estimates and, again, these are based on tightening the clamp 2.5 full turns from the tire-touch point on Michelin Carbon tires.

--Steve
joevella is offline   Reply With Quote
Old 10-17-08, 06:17 PM   #12
Technologist
Newbie
 
Join Date: Sep 2008
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I know this is an old thread but here is a working Archive of that branfordbike chart showing watts using a CycleOps Fluid 2 Trainer.

Any other charts like this? Please post them. Also is their any software or hardware to tap real or even approximate wattage off of a CycleOps fluid 2 Trainer? If not I might put something together.

http://web.archive.org/web/200508291...r/tr1biga.html
Technologist is offline   Reply With Quote
Old 10-18-08, 11:48 AM   #13
chuckb
Senior Member
 
Join Date: May 2006
Bikes:
Posts: 273
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What you need is
http://www.kurtkinetic.com/calibration_chart.php
http://www.kurtkinetic.com/computer_tech.php
chuckb 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 12:14 PM.