Advice on upping FTP on Rollers to account for wind resistance on road

hey gang,

just looking for some advice,

i do all my indoor training on ELITE MAG ROLLERS.
i just prefer to set my own cadence and have the bike fully move under me, its just more engaging than being stationary. cycling through gears & hitting the power targets just feels more natural.

I’m finding that doing the efforts and hitting power targets to my current FTP is easy to sustain.

my power source is favero assioma duel side power meter.

anaerobic efforts i don’t do indoors, i can easily cover upto VO2 efforts with the gearing i have on the bike.

should i up my FTP 10-15 watts to account for outside wind resistance in which the indoor workouts will be more challenging?

any advice is good advice thanks in advance.

FTP is FTP, whether you’re outside, on the rollers, or in space. What you can output is what you can output.

The speed will change. Especially in space.

3 Likes

i agree to dis agree,

300w stationary compared to 300w outside is totally different. wind resistance plays a huge part in output.

How so? 300w is 300w. That’s the exact reason we use power as a measurement, so we can make the comparison.

2 Likes

Can you explain what you mean by this? Specifically, how does wind resistance increase or decrease the power you are putting into the bike?

1 Like

A block headwind may increase your pedalling power phase just like a steep hill would. That will be different to keeping the roller speed topped up, which is more similar to a track.

In that regard, you’re right, the same power will feel different.

If that’s something you want to control for, you can add magnetic resistance to your rollers to more closely mimic the headwind effect.

1 Like

ok, i agree 300 is 300 your power is power, i think I’m more referring to the effort to sustain that power as external elements have changed. the feel and effort for the same power is different.

Looks like you’ve added your roller model to the question; that helps.

If the max resistance doesn’t feel like a headwind or hill, there may be a way to modify it.

Others here will have a better comparison for mag rollers to turbo trainers in terms of this resistance effect. I’ve only ever used regular rollers.

I still wouldn’t increase power for the same type of work. You could try some lower cadence work if you want to train that wider power phase. Sorry, that’s probably something you’ve already thought of, though.

1 Like

I wouldn’t change it.

-end of message-

This is true. So long as you have the same meter inside and out, 300w is 300w. However, it’s typically the case that your body temp runs hotter inside than outside where you have better cooling, unless you’ve got some serious fans set up.

How did you determine your FTP? If the workouts feel too easy indoors, it might just be set a bit low?

2 Likes

initilly ftp testes then AI detection there after. my FTP is 310 it seem about right outside, inside it feels easy. maybe because I’m not on a kicker where the trainer grabs and holds you in and around the target power.

A lot of times it is the other way around - people feel their outdoor FTP is higher than indoor. Multiple factors including cooling play into it.

I have heard the argument outdoors that it is harder to put out power into a block headwind. Some may be psychological, but wind resistance on the legs can also be a factor.

Regardless, this thread previously generated a lot of discussion and worth a look.

1 Like

If you are now using AI FTP stick with it and report in your post ride survey if you felt it easy. If the system thinks so it will soon ramp up your PL’s and subsequent AI FTP; to do it manually risks burn out IMO.

2 Likes

it doesn’t really make sense… the only thing I can think of is that the difference between avg power and normalized power will likely be larger outdoor then indoor… Outdoor, you will have to more micro accelerations with corners, trafic, … And with regards to wind. if there are a lot of wind gusts, instead of a steady wind resistance, I think this will play negatively into your NP too.

But avg Power vs NP is easy to track, so take a look at that :slight_smile:

But for a steady outside ride, 300 watt is 300 watt, and it’s more likely that your power indoor will be less due to lack of cooling

2 Likes

thanks all for your input.

ill stick to the way things are and just rate the workout easy or not and will go from there.

i have workout BYRAM first thing tomorrow morning threshold at 5.9. we will see how go in terms of effort. 4x9min @ 105%.

Wind shoudn’t have any impact on the power that you can produce (unless it makes you severely hypothermic)

When I trained on rollers, I had issue doing the ramp test, because I run out of gears/cadence towards the end of the ramp. I just couldn’t increase power anymore. I could never use that FTP value, because it was too low. For training, I didn’t really need to go to power that high, so it wasn’t an issue. (I didn’t do sprints inside). But it did affect the ramp test. I wonder if you had the same issue?

In any case AI FTP should increase your FTP, if it is too low inside.