I have just installed a power sensor, cadence and speed.
My bike is a DeRosa King so the mount was a bit difficult do to the chain stay curvature.
Power sensor needs to be tilted about 30 degrees downward (on outboard side) so that cadence can be picked up and very little rubber used so that chain will not rub top of sensor.
After riding 700 miles this way all seems to work OK except it is saying that I am heavily right leg dominant in my pedaling power.
Is this true or is it something about an improper installation?
What does a proper installation really look like?
I have worked hard to use more left leg in training but the sensor still says too much right leg power.
Also, I was getting beeps starting and stopping the speed and cadence during a ride too often until I just changed the battery. Is the symptom of low battery such behavior? Seems to have stopped now.
After riding 700 miles this way all seems to work OK except it is saying that I am heavily right leg dominant in my pedaling power.
Mine tells me the same thing, even though I'm left handed and left footed, and I KNOW my left leg works harder. Actualy it reads 50/50 about half the time and 55/45 or even 65/35 the other half of the time.
I thought about how it must conclude which leg your power is coming from. After all, it just knows the continuous chain tension and the instant the right-hand crank passes the chainstay sensor each time around. It probably attibutes chain tension in the (0.25-0.75) interval between pulses to be the contribution of the right leg. (BTW I fooled it by unclipping my right foot entirely. It just a little pulling up on the left-hand pedal to fool the thing into telling me I was right-leg dominant.)
This is probably not a bad theoretical approach, but there's definitely something wrong in the implementation. I won't try to guess what, but it might have to do with the model's assumptions about the exact lag time in the chainstay measurement subsystem--since it probably does filtering, there's going to be some delay.
They have not had the curtesy to respond. Too bad, thought they were a good company.
"Pete Harris" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
Quoted message said:
After riding 700 miles this way all seems to work OK except it is saying that I am heavily right leg dominant in my pedaling power.
Mine tells me the same thing, even though I'm left handed and left footed, and I KNOW my left leg works harder. Actualy it reads 50/50 about half the time and 55/45 or even 65/35 the other half of the time.
I thought about how it must conclude which leg your power is coming from. After all, it just knows the continuous chain tension and the instant the right-hand crank passes the chainstay sensor each time around. It probably attibutes chain tension in the (0.25-0.75) interval between pulses to be the contribution of the right leg. (BTW I fooled it by unclipping my right foot entirely. It just a little pulling up on the left-hand pedal to fool the thing into telling me I was right-leg dominant.)
This is probably not a bad theoretical approach, but there's definitely something wrong in the implementation. I won't try to guess what, but it might have to do with the model's assumptions about the exact lag time in the chainstay measurement subsystem--since it probably does filtering, there's going to be some delay.
