CycleOps Power Curve
hugo15
Posts: 1,101
When I bought my CycleOps Jet Fluid Pro turbo trainer one of the things that came with it was a power curve chart that plotted speed against power.
I don't have any power measurement but was wondering if I could use the speed from my computer and the chart to approximate the power.
Can anyone with a Jet Fluild Pro and a Powertap comment on whether the chart is close or not.
I don't have any power measurement but was wondering if I could use the speed from my computer and the chart to approximate the power.
Can anyone with a Jet Fluild Pro and a Powertap comment on whether the chart is close or not.
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Comments
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There's a plugin for SportTracks that calculates power from speed for a range of turbos. You can get trial versions of ST and the plugin for free
If you haven't got a headwind you're not trying hard enough0 -
IIRC the resistance of the cycleops was designed to replicate realistic road resistance, assuming flat and windless of course. don't know if thats of any use to you?0
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I've had a look at the CycleOps website.
Here's a curve for a bicycle with a Cd of 1.00.
0.0052 Tyre RR. 0.43 m^2 area.
A normal everyday sports touring bike. WITH mudguards
The CycleOps curve is pretty damned close to a 'real life' training/winter/Audax bike.
In fact, its closer than the £4500 LifeFitness ergometer I use at the gym.... 0 -
Chiggy - this is one reason I bought one - 25mph on it feels like 25mph on the road (assuming flat / still etc etc) which is a great way of training for TTing if you don't or can't use a power meter.0
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SteveR_100Milers wrote:Chiggy - this is one reason I bought one - 25mph on it feels like 25mph on the road (assuming flat / still etc etc) which is a great way of training for TTing if you don't or can't use a power meter.
I find mine completely different to the road, nothing like the same inertia and power production is massively influenced by that for me.Jibbering Sports Stuff: http://jibbering.com/sports/0 -
jibberjim wrote:SteveR_100Milers wrote:Chiggy - this is one reason I bought one - 25mph on it feels like 25mph on the road (assuming flat / still etc etc) which is a great way of training for TTing if you don't or can't use a power meter.
I find mine completely different to the road, nothing like the same inertia and power production is massively influenced by that for me.
25Mph on my cycleops means I have to mash more than normal, due to the low inertia like Jim says. The only way I can make this seem like a valid training session is to treat it like a hill session. i.e. I visualise the mashing feeling is going up hill. Trying to visualise its a flat TT just leaves me feeling like its unrealistic as I cant generate the required power for my normal high cadence.
The turbo seems to leave my legs much more fatigued than when out on the road. Not sure if this will ultimately translate to better road performance but guess its better than nothing!0 -
Mine feels very road like, no inertia probs :?
I agree that the speed/power is akin to my winter bike with mudguards...0 -
NapoleonD wrote:Mine feels very road like, no inertia probs :?
My theory is that it's heavily related to how you generate the power during the pedalling phase on how much the inertial differences impact you. Power measuring pedals (with sufficient accuracy to see where through the stroke) will I think reveal a lot.Jibbering Sports Stuff: http://jibbering.com/sports/0 -
Question: Where do you feel the burn on the turbo. For me its predominately a quad burn and also feel it more in the calf's an hamstrings than on the road.0
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NapoleonD wrote:Mine feels very road like, no inertia probs :?
I agree that the speed/power is akin to my winter bike with mudguards...
Do you use your Powertap wheel on the turbo? If you do, what sort of power do you get at 15, 20 and 25 mph?
If the graph is accurate 15 mph is about 125 watts, 20 mph is about 250 watts and 25 mph is about 450 watts.
Would really appreciate it if you could do a little test.0 -
Agreed here that it doesn't feel exactly the same for the same inertial reasons, but training at a TT target speed that was close to that which I wanted to achieve on the road showed a reasonable correlation. The only real advantage is that I had a pretty good idea of what was a realistic target time for a TT. Given a turbo lends itself more to a 'mashing' style its pretty good for TT training!0
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hugo15 wrote:NapoleonD wrote:Mine feels very road like, no inertia probs :?
I agree that the speed/power is akin to my winter bike with mudguards...
Do you use your Powertap wheel on the turbo? If you do, what sort of power do you get at 15, 20 and 25 mph?
If the graph is accurate 15 mph is about 125 watts, 20 mph is about 250 watts and 25 mph is about 450 watts.
Would really appreciate it if you could do a little test.
Can't at the moment cos I'm poorly sick but I'll have a look through my files.0 -
For interest, 32 mph on a SWorks holding the drops is 650 W.
Check CycleOps curve to see what speed you need to do to attain 2/3 of 650 W 430 W. 26 mph.
Select the gear which is 100 - 105 cadence at 26 mph and do this for 45 - 50 minutes and use your imagination so you are in the middle of the bunch approaching a sprint finish from the 40 km flag. 0 -
The bike geek has done the analysis already.
As it happens we are using his algorithm to calculate a virtual power display for Fluid 2 trainers in the realtime mode for the next release of golden cheetah. We have coded up for Kurt Kinetics too. Watch this space!--
Obsessed is just a word elephants use to describe the dedicated. http://markliversedge.blogspot.com0 -
hugo15 wrote:25 mph is about 450 watts.
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That sounds way over. My FTP was only around 300w when I did a mid 57 25TT. Even a TT bike wont give you 150w!0 -
liversedge wrote:The bike geek has done the analysis already.
As it happens we are using his algorithm to calculate a virtual power display for Fluid 2 trainers in the realtime mode for the next release of golden cheetah. We have coded up for Kurt Kinetics too. Watch this space!
Thanks for the link.
Any idea if the curve for the fluid2 is the same as the Jet Pro that I have got?0 -
a_n_t wrote:hugo15 wrote:25 mph is about 450 watts.
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That sounds way over. My FTP was only around 300w when I did a mid 57 25TT. Even a TT bike wont give you 150w!
The 450 was estimated off the graph. The link Liversedge posted suggests it might be closer to 400 watts. Still higher than your evidence :?0 -
I do around 300 watts for just under 26mph on the TT bike on the road.0
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NapoleonD wrote:I do around 300 watts for just under 26mph on the TT bike on the road.
Sounds about right compared to my findings :0)0 -
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Coefficient of dragbirdy247 wrote:What does cd mean?0 -
SteveR_100Milers wrote:+1 I'd say that's more likely.
Sorted. Now all I have to do is get back upto that level by March! :shock:0 -
NapoleonD wrote:hugo15 wrote:NapoleonD wrote:Mine feels very road like, no inertia probs :?
I agree that the speed/power is akin to my winter bike with mudguards...
Do you use your Powertap wheel on the turbo? If you do, what sort of power do you get at 15, 20 and 25 mph?
If the graph is accurate 15 mph is about 125 watts, 20 mph is about 250 watts and 25 mph is about 450 watts.
Would really appreciate it if you could do a little test.
Can't at the moment cos I'm poorly sick but I'll have a look through my files.
Nap
Have you had a chance to check this out? I am also wondering what sort of speeds people average on theirs.
For a 2 x 20, I will hit around 21-22 Mph. No idea what my FTP is though.
Would be interested to hear what people with a known FTP can maintain.
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Can't see how this is going to help you much - each setup (even using the exact same model of trainer) is going to vary due to rolling resistance differences due to using different tyres, tyre pressures and roller pressures.birdy247 wrote:Would be interested to hear what people with a known FTP can maintain.
If you want to find out your FTP, get a powermeter, otherwise it's irrelvant to your training (unless you just want to use it for willy waving down the pub with your mates).0 -
Bronzie wrote:
Can't see how this is going to help you much - each setup (even using the exact same model of trainer) is going to vary due to rolling resistance differences due to using different tyres, tyre pressures and roller pressures.birdy247 wrote:Would be interested to hear what people with a known FTP can maintain.
If you want to find out your FTP, get a powermeter, otherwise it's irrelvant to your training (unless you just want to use it for willy waving down the pub with your mates).
Yea, just general curiosity0 -
If you can't borrow a powermeter from a friend, then I'd say you'd be best just go and get a ramp test done.........could probably find the local uni sports department are looking for willing subjects for some research projects and get it done for free.
I can't honestly see how you could reliably use speed from a turbo to gauge your FTP given the variables involved. Even if someone can verify Cycleops power curve, it doesn't mean your setup will be the same.
With an error of +/- 10% you could be 30-40W out which is a pretty big margin of error when talking about FTP (the difference between being mediocre and above average).0
