Sports & Fitness Archive

Vector 3 Weirdly low power

Weirdly low power

Former Member over 7 years ago

hey all!

I just got my new vector 3 pedals yesterday and installed them tonight. Put them on, did the calibration and rode for a little bit on my trainer and then calibrated it again. Entire time I am seeing extremely low power numbers, like 80-100 while "cruising" and 200-250 when all out on 3S average setting. Anyone have suggestions for tomorrow's workout? Really excited to have power to train with, but I know those numbers can't be right

0 Former Member over 7 years ago

Oh and I'm using a FR920 if that matters

0 chunkywizard over 7 years ago

Have you got another power meter? How do you know the figures can’t be right? Strava estimates power but I don’t know how accurate it is.

0 Former Member over 7 years ago

No other PM, but I'm a strong cyclist and the last time I used power on a CompuTrainer I was up around and above 200 consistently. 60-80 watts just seems unbelievably low.

0 aweatherall over 7 years ago

Are you getting power from both pedals? Add the power balance data field to your display and see what it reports. Also go down to the sensor about page for Vector and see that the right pedal is connected.

0 Former Member over 7 years ago

Getting power balance numbers, roughly 55-45 which is what I'd expect since I have a back issue that affects my right leg

Right pedal shows as connected in Connect, 920 only shows 1 powermeter connection although I'm guessing this to be normal

0 aweatherall over 7 years ago

That is correct. The left pedal is the master. The right pedal sends data to the left pedal. The left pedal aggregates the data from both pedals and sends the data to the head unit.

Check the crank length is correctly set on the 920. On the 920 the crank length is under the bike profile.

The only other thing is did you tighten the pedals down good and firm when you installed them?

0 Former Member over 7 years ago

I made them as tight as I was comfortable since it was my first time installing pedals and I didn't want to screw anything up. I didn't use a torque wrench as I don't have a 15mm crowfoot, but I tightened them like I would if I had a 25ft/lb part on a car...

0 Former Member over 7 years ago

Here is the power profile from my half IronMan in Arizona last October. As you can see there should be no reason for my power to be 60 to 80 while riding normally and 250 to 280 when pushing hard like it shows from the pedals ciq.forums.garmin.com/.../1294952.png

0 t_smit over 7 years ago

As aweatherall says, you should check the crank length setting that is reported by the 920. You will need to connect with your pedals to check that. Even if the value shown is correct, you may want to edit the field and hit 'enter' to force that setting to be transmitted to the pedals.

The minimum possible crank length setting ends up being 110 mm, and if for some reason this value got pushed to the pedals then it could lead to the kind of numbers you are seeing.

0 Former Member over 7 years ago

OK, so I did an hour plus ride and in appears like it might be working properly now. I average wattage in the 120 to 140 range and when I pushed a hard effort it went up to 300W. I guess I just needed to ride them more and calibrate it a couple more times