New Lightweight Obermayer (pic included)

[audiophilitis]

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.

[tcurtbike]

A magnet's a magnet, should work with any sensor.

[audiophilitis]

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?

[tcurtbike]

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.

[Geoff]

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.

[nismosr]

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

[Northoceanbeach]

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

[audiophilitis]

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?

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

Thanks Edwin. Maybe this weekend?

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.

[mjduct]

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

[audiophilitis]

Yeah -- thought about that but a lot of our rides are along tree-lined roads so the speed display will be sporadic.

[sungod]

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

[audiophilitis]

Great info -- thanks!