Speed sensor correcting GPS

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Speed sensor correcting GPS

Postby DynoDon » July 10th, 2019, 7:28 pm

There are a few brands doing this, here is one of them,, one of the techs at the shop I go to uses one of these, he says it works great, I'm still using a wheel magnet, maybe I should put two, or three magnets on my wheel, I could go a lot faster.

https://www.wahoofitness.com/devices/bi ... eed-sensor
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Re: Speed sensor correcting GPS

Postby bbender785 » July 11th, 2019, 6:26 am

i use a chinese knockoff with my Wahoo GPS on my mountain bike and it does clean things up alot (when it works... the actual one you posted is on my wish list).

i personally have no desire for one on the road/gravel bike since keeping a consistent GPS signal usually isn't an issue on the open road going in straight lines, but for in the woods under dense foliage with lots of switchback singletrack, i think it's a must if you want accurate data on the mountain bike.
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Re: Speed sensor correcting GPS

Postby Roy » July 11th, 2019, 7:37 am

Don,
It is kinda like Einstein physics, the faster you go (on a mountain bike trail) the shorter is the GPS distance and speed.
Doesn't a Speed sensor correcting GPS just read out wheel sensor data, or is there an algorithm that rectifies the 2 data fields?
Buy one and test it out and let this form know your results. Compare "The Hick" data to "Poto" data.
But don't ride "double blind"!

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Re: Speed sensor correcting GPS

Postby Steve_Kinley » July 11th, 2019, 8:34 am

I have Wahoo speed sensors connected to a Wahoo Elemnt and I really don't see it correcting Strava distances while on MTB trails. While stationary and spinning the wheel the sensor is showing speed but overall doesn't appear to have corrected GPS recorded distances.
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Re: Speed sensor correcting GPS

Postby c0nsumer » July 11th, 2019, 8:48 am

Steve_Kinley wrote:I have Wahoo speed sensors connected to a Wahoo Elemnt and I really don't see it correcting Strava distances while on MTB trails. While stationary and spinning the wheel the sensor is showing speed but overall doesn't appear to have corrected GPS recorded distances.


This is all dependent on if the head unit (Element) uses distance from, or in conjunction with, the GPS data when recording. And, what the interpreting software (Strava) does with it all.

Read my writeup here on how not using a wheel (speed) sensor can induce significant under-recording on MTB trails: https://nuxx.net/blog/2011/08/28/garmin ... 10-sensor/

Of course, your head unit has to make appropriate use of it to matter. I have no idea what Wahoo units do, but I do know that Garmins will prefer the wheel sensor if present.
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Re: Speed sensor correcting GPS

Postby bbender785 » July 11th, 2019, 9:56 am

c0nsumer wrote:This is all dependent on if the head unit (Element) uses distance from, or in conjunction with, the GPS data when recording. ...I have no idea what Wahoo units do, but I do know that Garmins will prefer the wheel sensor if present.


"Many ELEMNT features depend on good GPS data to track location, speed, and progress. Speed is calculated using GPS data by default, but a standalone speed sensor can be paired which will override GPS data and generally improve accuracy"

https://wahoofitness.yonyx.com/y/conver ... 764e10d166
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Re: Speed sensor correcting GPS

Postby b_b » July 11th, 2019, 11:19 am

Steve_Kinley wrote:I have Wahoo speed sensors connected to a Wahoo Elemnt and I really don't see it correcting Strava distances while on MTB trails. While stationary and spinning the wheel the sensor is showing speed but overall doesn't appear to have corrected GPS recorded distances.

Strange Wahoo speed sensor increased my Strava trail mileage by about 15% with POLAR unit although still seems a bit low.
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Re: Speed sensor correcting GPS

Postby bax » July 11th, 2019, 11:44 am

I know on my Element w/speed your tire dia. has to be set on the speed sensor.......
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Re: Speed sensor correcting GPS

Postby b_b » July 11th, 2019, 12:08 pm

bax wrote:I know on my Element w/speed your tire dia. has to be set on the speed sensor.......

For sure and good point. Easiest way is put a dab of paint on a knobby and roll the bike and then measure.
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Re: Speed sensor correcting GPS

Postby Steve_Kinley » July 12th, 2019, 10:54 am

I will have to check but pretty sure I have the unit set to use the sensor and also not auto calculate tire diameter. I always set diameter from using a one wheel roll from valve stem to valve stem, applying pressure on the front to simulate tire load.
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