I'm looking for suggestions as to the best place to mount a Tempe unit on a drop bar road bike. Ideally out of the sunlight, far enough from the rider not to be influenced by body temp, not obstructed from broadcasting to a wrist watch, and secure enough not to tap tap tap the frame. I don't ride with a saddle bag.

Tempe is just bigger than a quarter, has a clip, and weighs about a gram so there's no worry about it throwing anything off balance.

Currently it's attached to the Di2 junction box under the stem, but that's kind of tacky.

Zip tie it on top of the seat post ?

I found a spot on the bottom of the rear derailleur. Sun doesn't reach, and it's far enough away from me.

Is there any carbon in an Ultegra Di2 RD? I think it's all metal and plastic, which would mean the sensor won't crack the casing.

Placing it that low to the ground, wouldn't riding on hot asphalt in the summer really throw the readings off with the radiant heat from the asphalt? I've never seen one of these units or even knew they existed so it's just a guess on my part.

Out of idle curiousity, what are you doing with the temperature data?

​​​​​​Good point about radiant heat from the pavement. Not sure where else it could go for a "clean" reading. I'm assuming the bottom of my saddle is going to let plenty of body heat through.

Edge units have a thermometer in them. Anything with a barometer does, you need to know the temperature of the air you're measuring to determine altitude from pressure. But the Edge ones tend to go out in front of the bars and measure from the bottom, so they give you a pretty good reading and there's no reason to use a Tempe with them. I don't think Strava keeps the data but you'll see it in Connect.

Honestly, not very much. My watch has a thermometer and records the temp along with all the other data, but it's obviously very wrong. That bothers me enough to spend the $20 to get it right. (They last years.)

In other activities like skiing and backpacking, it's useful for how to dress because that seems to change, cold bothers me more as I get older.

https://support.garmin.com/en-US/?fa...nZ99DcunfAue66

I put it on my (running) shoe. Rarely used on a bike. Would be on my shoe or just lying in a bag.