cadence

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ejenks
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cadence

Post by ejenks » Sat Jul 07, 2018 11:51 am

I have a Genius and recently changed my crank to a compact for my road bike and experiencing cadence drop could this change be the problem.

ttelmah
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Re: cadence

Post by ttelmah » Sun Jul 08, 2018 8:55 pm

Not directly.
Are you sure you got the cadence magnet correctly placed on the crank arm with the change?.
Similarly when doing it are you sure the detector didn't get moved?.

mcorn
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Re: cadence

Post by mcorn » Tue Jul 10, 2018 2:33 am

Not sure what make of cadence sensor you are using, but I would be sure it has a fresh battery.

ejenks
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Re: cadence

Post by ejenks » Fri Jul 20, 2018 2:35 pm

The Tacx cadence sensor comes built into the TTS4 software I do not have any other sensor

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Alex Masalovich
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Re: cadence

Post by Alex Masalovich » Fri Jul 20, 2018 8:48 pm

ejenks wrote:
Sat Jul 07, 2018 11:51 am
and recently changed my crank to a compact
Has the length of the crank changed?
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mcorn
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Re: cadence

Post by mcorn » Sat Jul 21, 2018 4:32 pm

ejenks wrote:
Fri Jul 20, 2018 2:35 pm
The Tacx cadence sensor comes built into the TTS4 software I do not have any other sensor
I incorrectly assumed you meant the cadence was not working correctly. The silly answer is to pedal faster, which might mean use a lower gear. If you recalibrated after changing the crank and had not recalibrated for a while, you might now be pedaling slower because the resistance on the brake has changed after recalibrating. An incorrect calibration can make the pedaling easier than it should be, which means you pedal faster.

ttelmah
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Re: cadence

Post by ttelmah » Sun Jul 22, 2018 7:25 am

Agreed on the incorrect assumption.
If he crank length has reduced, it requires you to supply more force at the pedal to turn at a given cadence. If you can't supply this, then your cadence will reduce.

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Alex Masalovich
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Re: cadence

Post by Alex Masalovich » Sun Jul 22, 2018 7:35 pm

ttelmah wrote:
Sun Jul 22, 2018 7:25 am
If he crank length has reduced
I assume that the value of the cadence will decrease with any change in the length of the crank, since the other amplitude of the leg movement will be unusual at first.

It is possible that the unusual nature of the new gear ratios can also lead to a drop in the value of the cadence.
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ms6073
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Re: cadence

Post by ms6073 » Fri Jul 27, 2018 6:31 pm

I think some clarification is needed from the OP as I interpret the word 'drop' to mean the cadence intermittently drops to 0, not that there is difficulty maintaining the same cadence as before changing cranks. Also, I regularly switch between the road bike with 52/38 with Absolute Black oval chainrings and my cross/gravel bike with WickWerks 46/36 round chainrings and never noticed an issue with cadence.
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ttelmah
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Re: cadence

Post by ttelmah » Fri Jul 27, 2018 8:46 pm

Agreed.
That was my original thinking, which is why I was talking about magnet misalignment, and anothe poster suggested battery.
Not sure which interpretation is right...

mcorn
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Re: cadence

Post by mcorn » Sun Jul 29, 2018 6:10 pm

I came to the conclusion he was not describing cadence malfunction but a change in his turnover rate, possibly due to new gearing with the new crank (or other factors, such as recalibration). Cadence malfunction is usually evidenced by no cadence at all, intermittent cadence, or wildly changing cadence numbers, none of which he hinted at.

maciejw
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Re: cadence

Post by maciejw » Thu Jan 10, 2019 5:15 pm

Hello

I new to this, so excuse my ignorance please and bare with me :) I've just bought satori smart and I have an issue with cadence measurement concept.

satori has power meter and speed/cadence sensor, to measure real cadence you have to assume gear ratio. without it whole cadence concept is pointless.

lets say I have 1:1 gear ratio. if you assume that I have wheel circumference 2155mm you can calculate how many turns of a trainer wheel equals to one rotation of a bike wheel and crank. but if I change my gear ratio to 1:2 trainer has no idea about it, now I can drop my cadence by half and speed will be the same and power will be the same measured at the wheel.

my conclusions:

1. comparison of cadence to my outdoor rides is pointless,
2. I can compare cadence indoor when I never change gears.
3. when I want to increase my power consumption, I have to use trainers leaver this will simulate slope.
4. when I need to change my gear ratio because my cadence is dropping to much, I do not change my gears I have to use trainers leaver.

then and only then I can compare my training I did 2 months ago with current, am I correct?

ps.

another possibility is that you count power peaks during ride and assume that certain peaks equals to pedal strokes, this way you are independent of gear changes. Is this possible to measure this so accurately.

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Re: cadence

Post by mcorn » Thu Jan 10, 2019 6:17 pm

I think the only way the Satori can detect cadence is through the periodic power pulses on the crank (2 per revolution). A number of Tacx trainers attempt to detect and measure cadence this way with varying degrees of success. The best way to get accurate cadence is through a separate Bluetooth/ANT+ combo speed/cadence sensor that detects wheel and crank rotations using a magnet. A number of companies sell them (I use a Wahoo Blue SC) and in my experience they work well.

Effableizm
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Re: cadence

Post by Effableizm » Thu Jan 10, 2019 9:48 pm

i a Not so sure about the working and what make of cadence sensor you are going to apply but I recommend you to use a fresh battery.

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