I have connected my new Rotor INpower powermeter to my new Wahoo Elemnt Bolt device, but when I try to set the crank lenght the following thing happens: I change the value on my Bolt device to 170mm, then press calibrate and after calibrating the crank lenght is automatically set back to 172,5mm. Th…

I don’t know but, just interested for future ref if I ever go to pedal or arm based PM…Does the Rotor INpower have an app where you can change the arm length? If so, try that first then change on the Wahoo app perhaps? IIRC 172.5 to 170 is about 1.5% so keep riding with relative confidence. Report…

There is a Rotor app to connect the power meter, but you can’t adjust the crank length there… Do you mean the power output would also just give a difference from 1.5%? The pedaling circle will be smaller and with a higher power the difference will be bigger I think? I’ll try to connect Rotor itself,…

Right, remembered how to do it (assuming its the same for the Rotor): Make sure the head unit is turned on and paired with both your phone and unit before you start. Step 1 - open the Wahoo app and find the sensor: [Image (97)] Step 2 - configure crank length [Image (98)] Step 3 - default w…

[image] Nathalie_Verschelden: Do you mean the power output would also just give a difference from 1.5%? If I understood correctly, the accuracy gets worse by approximately 1% per crank length change if not set correctly.

Thank you for your answer! So do I have to stay on the page or not stay there on the Bolt when calibrating through the Rotor app? Should I close the page in the Wahoo app before switching to the other app?

It shouldn’t make a difference with the head unit as Wahoo should have ‘set’ the sensor as the right length by that point. I’d try just opening the Rotor app as I don’t recall deliberately closing the Wahoo app.

It didn’t work out unfortunately… I contacted Wahoo support and they told me it’s a software bug. So they will prepare and update so solve the issue. So that’s good news. :slight_smile: Thanks you for your answers!

From what I heard from support calibrating the Rotor is enough and the crank length doesn’t affect the power… It seems to be a bug in Wahoo which they will solve :slight_smile: Thanks again!

Sorry to dig up an old thread, do you mean that setting the correct crank length on the Rotor app is enough to solve the issue or that calibrating on the Wahoo was enough (without doing anything on the Rotor app) ? Running into the same issue.

Wahoo Elemnt Bolt crank length issue

Equipment

Wolflikeme February 16, 2022, 1:47am 20

I came to this conclusion as well and emailed a contact at Rotor I have to see if this seemed accurate. His reply was that a 5% variance between a trainer’s power reading and a dedicated on-bike power meter was due to drivetrain loss and totally normal so I think I’m okay with the delta now.

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Wahoo Elemnt Bolt crank length issue

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Wahoo Elemnt Bolt crank length issue

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