Garmin E500 sensor location full susser MTB

[The Ghost]

Oh, so the Garmin Edge 500 manual recons that the sensor goes on the chainstay and the magnet on the spoke and cadence joll on the crank, no problem.

 

But on a full susser, the chainstay moves in relation to the crank when the suspension compresses. Does this affect the readings?

 

Truth be told Im not really interested much in cadence, but am I right in assuming that the hub of the rear wheel and the chainstay move together and hence it does not affect the speed readings?

[jannosmit]

Don't think it will matter, but leave the cadence for the roadbikes imho

[Tankman]

 

Truth be told Im not really interested much in cadence, but am I right in assuming that the hub of the rear wheel and the chainstay move together and hence it does not affect the speed readings?

 

If your not bothered with cadence, why bother with the sensor at all.

 

You have a GPS ... it will give you your speed very accurately without the sensor!

[The Ghost]

There is the school of thought that says the sensor reading is more accurate than the GPS.

[petatodd]

That school of thought is wrong. A slight miss alignment of the sensor and the magnet stuffs it all up, speed is wrong and distance is wrong. I have found using the sensor for speed/distance is useless.

[Tankman]

There is the school of thought that says the sensor reading is more accurate than the GPS.

 

You have clearly been AWOL from class!

 

Been riding without the speed senor forever and the gps has never been wrong. It simply does its job ... without a little magnet interfering.

 

I only use the cadence sensor on any of my bikes.

[scotty]

 

I only use the cadence sensor on any of my bikes.

Trying to work this out

[NotSoBigBen]

Trying to work this out

 

Me thinks that if you put no magnet on the wheel that it won't pick up wheel speed and only the magnet on the crank for cadence but I am sure the 'hub scientists' will respond post haste .....

[Tankman]

Trying to work this out

 

Yup, NotSoBigBen worked it out.

 

Put the magnet on the crank only ... capice?

[Doggone]

The difference between the speed sensor reading and the satellite reading is technically vast as they measure two different things. The actual readouts however dont differ by much so people assume they are the same thing.

 

The satellite reading is the dustance travelled as measured in the vertical plane. When riding a bicycle hiwever we encounter uphills and downhills. This effect is negated by the gps reading. Consequently the distance measured by the gps should always be slightly less than the sensor gives. Most races these days use gps distances.

 

Btw I have switched off my cadence and distance sensor as I am too lazy to replace the battery and who needs cadence on a mtb anyway. The sensor has no problem on my ds swingarm when the battery is new. Im just a lazy bugger and the gps info is good enough for me.

[EZRider]

The difference between the speed sensor reading and the satellite reading is technically vast as they measure two different things. The actual readouts however dont differ by much so people assume they are the same thing.

 

The satellite reading is the dustance travelled as measured in the vertical plane. When riding a bicycle hiwever we encounter uphills and downhills. This effect is negated by the gps reading. Consequently the distance measured by the gps should always be slightly less than the sensor gives. Most races these days use gps distances.

 

Btw I have switched off my cadence and distance sensor as I am too lazy to replace the battery and who needs cadence on a mtb anyway. The sensor has no problem on my ds swingarm when the battery is new. Im just a lazy bugger and the gps info is good enough for me.

 

The Garmin edge 500 also measures vertical change in altitude and takes this into account.

I just finished the Forest 2 Falls 70 with 1600 m total ascent and the GPS unit was spot on at 68,9 km - this was the actual distance measured by non GPS units too.

[Tankman]

The Garmin edge 500 also measures vertical change in altitude and takes this into account.

I just finished the Forest 2 Falls 70 with 1600 m total ascent and the GPS unit was spot on at 68,9 km - this was the actual distance measured by non GPS units too.

 

Eggxactly ... technology hard at work ... not some half arsed attempt.

[Doggone]

 

 

The Garmin edge 500 also measures vertical change in altitude and takes this into account.

I just finished the Forest 2 Falls 70 with 1600 m total ascent and the GPS unit was spot on at 68,9 km - this was the actual distance measured by non GPS units too.

 

I take your point on the smartness of the technology and admit that I was not aware that the calculation includes a change in altitude. This will make it more accurate and therefore the difference in the two distances measured will be so small that it is not noticeable.

Edited April 29, 2012 by Doggone

[Mackie]

Cadence sensor on a MTB = Bar ends on a road bike.