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Calibrating power vs speed for a trainer
I am using BikeStudio software
http://www.powercurvesensor.com/bikestudio/ but I have doubts about whether the power vs speed curve for my trainer is correct. Does anyone have any good ideas on how to calibrate my trainer from first principles without needing $100,000 worth of lab equipment? Borrowing a bike with a PowerTap hub seems to be the easy way out, but I worry that the bike I currently have on the trainer (an old mountain bike with a clapped out road slick) would have substantially different tire losses than most bikes that have a PowerTap hub installed. Any good ideas out there? |
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#2
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Calibrating power vs speed for a trainer
On Sun, 19 Feb 2017 04:25:06 +0000 (UTC), Ralph Barone
wrote: I am using BikeStudio software http://www.powercurvesensor.com/bikestudio/ but I have doubts about whether the power vs speed curve for my trainer is correct. Does anyone have any good ideas on how to calibrate my trainer from first principles without needing $100,000 worth of lab equipment? Borrowing a bike with a PowerTap hub seems to be the easy way out, but I worry that the bike I currently have on the trainer (an old mountain bike with a clapped out road slick) would have substantially different tire losses than most bikes that have a PowerTap hub installed. Any good ideas out there? Not a solution to the accuracy of your trainer but http://www.americanroadcycling.org/a...WattsSpeed.htm might give you some numbers to cross check with. -- Cheers, John B. |
#3
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Calibrating power vs speed for a trainer
"Ralph Barone" wrote in message news I am using BikeStudio software http://www.powercurvesensor.com/bikestudio/ but I have doubts about whether the power vs speed curve for my trainer is correct. Does anyone have any good ideas on how to calibrate my trainer from first principles without needing $100,000 worth of lab equipment? Borrowing a bike with a PowerTap hub seems to be the easy way out, but I worry that the bike I currently have on the trainer (an old mountain bike with a clapped out road slick) would have substantially different tire losses than most bikes that have a PowerTap hub installed. Any good ideas out there? An alternative would be to find someone with a crank, chainset or pedal based power meter so you could swap their back wheel for yours to do the calibration. Also bear in mind that if you have a fluid trainer in particular the calibration curve will drift as the unit gets hot. Graham. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#4
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Calibrating power vs speed for a trainer
On Saturday, February 18, 2017 at 11:25:10 PM UTC-5, Ralph Barone wrote:
I am using BikeStudio software http://www.powercurvesensor.com/bikestudio/ but I have doubts about whether the power vs speed curve for my trainer is correct. Does anyone have any good ideas on how to calibrate my trainer from first principles without needing $100,000 worth of lab equipment? Borrowing a bike with a PowerTap hub seems to be the easy way out, but I worry that the bike I currently have on the trainer (an old mountain bike with a clapped out road slick) would have substantially different tire losses than most bikes that have a PowerTap hub installed. Any good ideas out there? slipping ? try tape or CRC BELT DRESSING .... CRC is prob solvent dilutable try CHOH .... figures relative to calories/miles or ? or a continuing performance index ? |
#5
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Calibrating power vs speed for a trainer
Graham wrote:
"Ralph Barone" wrote in message news I am using BikeStudio software http://www.powercurvesensor.com/bikestudio/ but I have doubts about whether the power vs speed curve for my trainer is correct. Does anyone have any good ideas on how to calibrate my trainer from first principles without needing $100,000 worth of lab equipment? Borrowing a bike with a PowerTap hub seems to be the easy way out, but I worry that the bike I currently have on the trainer (an old mountain bike with a clapped out road slick) would have substantially different tire losses than most bikes that have a PowerTap hub installed. Any good ideas out there? An alternative would be to find someone with a crank, chainset or pedal based power meter so you could swap their back wheel for yours to do the calibration. Also bear in mind that if you have a fluid trainer in particular the calibration curve will drift as the unit gets hot. Graham. Pedal based power sounds hopeful, as I could just leave the rest of the drivetrain in place. The only issue might be shoes (I run mountain SPDs, and I suspect most serious power junkies don't), but I could always ride in tennis shoes if I had to. My present "best idea" is to drive the crank of my bike with a hex key mounted in an electric drill and then measure the power consumption of the drill. I could tighten up the accuracy by measuring the power consumption of the drill at the same speed under no load to estimate mechanical losses in the drill, and also measuring the resistance of the motor winding to calculate I^2*R losses in the motor. All I need for that is an electrical power meter, which I can borrow from work, and a big-ass electric drill, which I'm sure one of my neighbours owns. |
#6
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Calibrating power vs speed for a trainer
https://www.milwaukeetool.com/power-tools/corded/1107-6
Ask goo or cusservice for a chart. No charts on android. |
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