Go Back  Bike Forums > The Racer's Forum > "The 33"-Road Bike Racing
Reload this Page >

road watts vs. trainer watts

"The 33"-Road Bike Racing We set this forum up for our members to discuss their experiences in either pro or amateur racing, whether they are the big races, or even the small backyard races. Don't forget to update all the members with your own race results.

road watts vs. trainer watts

Old 09-20-10, 08:54 AM
sittin' in
Thread Starter
aggro_jo's Avatar
Join Date: Aug 2006
Posts: 518
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
road watts vs. trainer watts

What are your observations in the difference?

Specifically, my Sat ride showed a 20 minute avg output of almost 30 watts higher than what I typically achieve when on a trainer doing a "formal" controlled test of the same duration.

Anyone have similar experiences or should I chalk it up to a bad test? TIA
aggro_jo is offline  
Old 09-20-10, 10:02 AM
Resident Alien
Racer Ex's Avatar
Join Date: Jul 2007
Location: Location, location.
Posts: 13,089
Mentioned: 158 Post(s)
Tagged: 0 Thread(s)
Quoted: 349 Post(s)
Likes: 0
Liked 9 Times in 5 Posts
A lot depends on how you have your trainer and training area set up, but generally most people have a noticeable drop on the trainer vs. riding outdoors.
Racer Ex is offline  
Old 09-20-10, 10:03 AM
Making a kilometer blurry
waterrockets's Avatar
Join Date: May 2006
Location: Austin (near TX)
Posts: 26,170

Bikes: rkwaki's porn collection

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 37 Post(s)
Liked 91 Times in 38 Posts
You can train up to where you'll do as well on a trainer, but it's different. You don't have as much inertia on a trainer, so the wheel slows a lot more during the weak part of the stroke, causing an acceleration/deceleration cycle that's greater than you'd see out on the road. That will make you more tired until you adapt your stroke.

As RX suggests, environment can play into it too, as it's common to overheat on a trainer, lowering power.
waterrockets is offline  
Old 09-20-10, 11:10 AM
grilled cheesus
aham23's Avatar
Join Date: Jun 2005
Location: 8675309
Posts: 6,956

Bikes: 2010 CAAD9 Custom, 06 Giant TCR C2 & 05 Specialized Hardrock Sport

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Liked 5 Times in 4 Posts
i have had to revert back to the trainer twice in the past two weeks. shorter days, more work, life, blah, blah, blah....

both had planned workouts that involved 5 min intervals of 300 to 325w. i was sufferring like a dog just to keep 300w. i was hot, uncomfortable, hot, and just down right not ready for any kind of trainer workout. they felt like 400 or 450w efforts. man, i dislike winter.

anyway, from last winter i realize that about 3 to 4 weeks into trainer season i will be adjusted this sufferring and it will not affect my performance as much. later.
aham23 is offline  
Old 09-20-10, 02:20 PM
Version 7.0
Hermes's Avatar
Join Date: Oct 2006
Location: SoCal
Posts: 13,052

Bikes: Too Many

Mentioned: 297 Post(s)
Tagged: 0 Thread(s)
Quoted: 1293 Post(s)
Liked 2,323 Times in 1,352 Posts
My power is lower on the trainer. WR gave the reason. My 20 minute road tests are on rolling terrain or climbing. On rolling terrain, the power drops and cadence increases after cresting a hill and the cadence drops and power increases when climbing. The cresting of a hill offers a few seconds on rest while I shift and get the power back up. And even climbing at slightly slower cadence for a few seconds offers change and mental recovery. The trainer is relentless. Whatever power and cadence one sets is what it is for 20 minutes which IMO is tough. And I try to minimize the effects of rolling terrain and hold constant power and cadence but it still is not perfect and I get some recovery during the road test.

My 20 minute power is different climbing, on the TT bike, on the track bike, on the road bike and on the trainer. I do not worry about it.
Hermes is offline  
Old 09-21-10, 06:30 AM
sittin' in
Thread Starter
aggro_jo's Avatar
Join Date: Aug 2006
Posts: 518
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
That all makes sense. Thanks for confirming my suspicions.
aggro_jo is offline  
Related Topics
Thread Starter
Last Post
Clydesdales/Athenas (200+ lb / 91+ kg)
05-02-14 01:48 PM
Training & Nutrition
09-19-12 08:14 AM
"The 33"-Road Bike Racing
11-09-11 01:27 PM
Road Cycling
09-22-10 04:39 AM
Road Cycling
02-27-10 01:28 PM

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.