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PostPosted: Wed Dec 12, 2012 3:11 am 
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Joined: Sun Jul 29, 2012 12:49 am
Posts: 236
Hello all-

Christmas came early and I just received my long awaited set of Lightweight Obermayers. Just a quick question regarding the built-in magnet...has anyone had success using it with the Garmin Cadence/Speed sensor mounted on the non-drive side chain stay? Would very much prefer to use this versus a spoke-mounted magnet.

Appreciate any recommendations from fellow enthusiasts.


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PostPosted: Wed Dec 12, 2012 3:43 am 
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Location: Melb, Australia
A magnet's a magnet, should work with any sensor.

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Posted: Wed Dec 12, 2012 3:43 am 


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PostPosted: Wed Dec 12, 2012 3:53 am 
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tcurtbike wrote:
A magnet's a magnet, should work with any sensor.


Well, the magnet is located in the rim, not on one of the spokes. Alignment with the cadence magnet mounted on the non-drive crank arm is the issue since there is only one sensor for both speed and cadence.

Any thoughts from experienced Lightweight users?


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PostPosted: Wed Dec 12, 2012 4:58 am 
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Did you read the instructions that came with your Garmin unit? It's as simple as aligning the appropriate sides of the Speed/Cadence sensor with your wheel and crank arm magnets. If you can, all is good. If you can't, you'll have to get a different ANT+ sensor (like this one or this one) or use a spoke magnet.

You don't need to be an 'experienced Lightweight user' to know that, just a bit of common sense.

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PostPosted: Wed Dec 12, 2012 6:12 am 
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I have always glued a magnet to the spoke on my LWs, as I don't want to mess-around with the sensor when I change to deep wheels. If all the magnets are in the same place, it is easier.


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PostPosted: Wed Dec 12, 2012 4:39 pm 
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congrats Tim ! when are we going to see the new wheels


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PostPosted: Wed Dec 12, 2012 4:46 pm 
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The magnets in the from right? How do you use it for a Cateye strada where the sensor mounts to the chainstay?


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PostPosted: Wed Dec 12, 2012 10:06 pm 
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Geoff wrote:
I have always glued a magnet to the spoke on my LWs, as I don't want to mess-around with the sensor when I change to deep wheels. If all the magnets are in the same place, it is easier.


Agreed -- that's probably the only option I have as well since the built-in magnet is too close to the BB. Just wondering if any of the Lightweight users have successfully utilized the built-in magnet as designed. With the Ventoux, built-in magnet is installed in the spoke, making it much more versatile. What kind of magnet did you use?

nismosr wrote:
congrats Tim ! when are we going to see the new wheels


Thanks Edwin. Maybe this weekend?

Northoceanbeach wrote:
The magnets in the from right? How do you use it for a Cateye strada where the sensor mounts to the chainstay?


I believe the magnets are on the non-drive side.


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PostPosted: Fri Dec 14, 2012 3:08 pm 
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if you are using it with a Garmin computer who cares?

just get the sensor lined up for your cadence and let the GPS calculate your speed


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PostPosted: Fri Dec 14, 2012 8:39 pm 
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Yeah -- thought about that but a lot of our rides are along tree-lined roads so the speed display will be sporadic.


Last edited by Powerful Pete on Sun Dec 16, 2012 6:20 am, edited 1 time in total.
Deleted the quote. PP


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PostPosted: Sat Dec 15, 2012 1:04 pm 
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Location: it's raining, it must be uk
even with good signal quality, gps speed/distance accuracy can be mediocre on fast twisty or hilly routes when using a basic gps or smartphone

it's better with devices that have doppler speed estimation, but small gps units usually don't have this, afaik none of the cycling-oriented gps units have doppler, nor any smartphone, instead they rely on a periodic join-the-dots approach, curves become a series of straight lines, i.e. shortened, accuracy gets worse as speed/curvature increase

typically the calculation is done in 2d, so gradient also affects accuracy, again the gps will read too low, even for movement in a straight line, it gets worse as gradient increases

if you want accurate speed (and distance), a device using wheel revolutions vs. time is best, as long as you do a rollout and calibrate to circumference


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Posted: Sat Dec 15, 2012 1:04 pm 


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PostPosted: Sun Dec 16, 2012 3:07 am 
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Great info -- thanks!


Last edited by Powerful Pete on Sun Dec 16, 2012 6:19 am, edited 1 time in total.
Deleted the quote. PP


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