Forums » Quarq Discussion » cadence sensor (11 posts)

cadence sensor
toddcd67
6 months, 3 weeks ago

Is anyone running the CinQo cadence sensor with the Gamin 500 and it's cadencespeed sensor? Any issues?
toddcd67
6 months, 2 weeks ago

Can some one from Quarq field this question? I'll reword it a bit.

When using the Garmin speed-cadence sensor with the CinQo and it's cadence capabilities, what is the recommended setup? Should the Garmin cadence magnet be left off the bike or is not not a big deal. Thanks!!
tgarson
6 months, 2 weeks ago

I don't work for Quarq, but I do have a GSC10 that I use with my CinQo with a 310XT. I am pulling this info from the Garmin forums:

The 310XT (and the 705, I also suspect the 500) process the speed and cadence data from the sensors in the following order of precedence, from highest to lowest:

  1. Power sensor speed (for a rear wheel power sensor)
  2. GSC10 speed

  3. GPS speed

  4. Power sensor cadence (from a crankset power sensor, not PowerTap hub)

  5. GSC10 cadence.
  6. PowerTap hub cadence.

So in summary, you may leave the crank arm cadence magnet on but it will be ignored in favor of the Quarq's cadence, I recommend leaving it off.

tgarson
6 months, 2 weeks ago

That came out really unreadable when I posted, but just to clarify. GSC10 speed is used over GPS speed. Quarq Cadence is used over GSC10 cadence. The stuff about Powertaps is just fyi.
SickBoy
6 months, 2 weeks ago

It's been my experience with my 705/GSC10 that, unless you have the GSC10 registering both cadence and speed, you won't get a readout on either on the head unit. Granted, if you're using the Quarq, the GSC10's cadence signal will be ignored - so if you want to use actual wheel speed instead of GPS speed, you also have to have the cadence magnet mounted to the crankarm.
Mieke@Quarq
6 months, 2 weeks ago

We don't really use the GSC10 speed / cadence sensors here. We just rely on the CinQo for cadence and the GPS for speed.

However, tgarson summed it up pretty well. The Garmin's will listen to cadence from the crankset based powermeter over the GSC10 cadence if both units are present on the same bike.
caspar
4 months, 3 weeks ago

Mieke, just to be sure. Can you confirm that when no other speed/cadence sensor is present, the Garmin 310XT will give a readout for cadence from the CinQo?
Jim@Quarq
4 months, 2 weeks ago

Yes. If you have a CinQo, the 310XT will use the cadence data from the CinQo. If you also have the GSC-10, the cadence data will be ignored.
stevei
4 months, 2 weeks ago

"It's been my experience with my 705/GSC10 that, unless you have the GSC10 registering both cadence and speed, you won't get a readout on either on the head unit. Granted, if you're using the Quarq, the GSC10's cadence signal will be ignored - so if you want to use actual wheel speed instead of GPS speed, you also have to have the cadence magnet mounted to the crankarm."

That does not match my experience. I have never stuck a magnet on my Cinqo crank arm, so my Garmin GSC10 cannot be giving out cadence data. However everything still works fine indoors on rollers, I get cadence from the Cinqo and speed from the GSC10, using an Edge 500 head unit.
packetloss
4 months, 2 weeks ago

GPS speed is worthless if you ride on anything other than flat terrain. It's value is based strictly on horizontal distance traveled and will be wrong when you ascend or descend.
stevei
4 months, 2 weeks ago

"GPS speed is worthless if you ride on anything other than flat terrain. It's value is based strictly on horizontal distance traveled and will be wrong when you ascend or descend."

Okay, suppose you climb up a 10% gradient. 10m horizontally, 1m vertically. By Pythagoras' Theorem, the distance travelled is the square root of 10^2 + 1^2, which comes to 10.05m. The error is 0.5%. If you're not happy with that, you must be really unhappy with a power meter at +/-2% accuracy.

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