Sun CompanyClip-on Bike Thermometer | Bicycle Handlebar Thermometer | Cycling Accessory

Many things (clouds, altitude, rain, wind) can affect temperature during a ride. This is a relatively cheap way to know the temperature. It's a bi-metal thermometer (I think) and does not require batteries. It's very easy to install and clips on the bars in seconds. A synthetic rubber insert may be used for small bars or remove the insert for larger bars. It's small and a little difficult to read while riding, but I managed. I have one on each of my road bikes and really like them.

I cannot even read the gauge while riding. It is not bigger than a thumbnail. Don't buy unless you have 20/20.

This is the pretty much the only bicycle thermometer out there, so if you really one one, this is it. Pros: Fits on handle bar very nicely and has great custom spacer to make it fit really nicely. It is easy to remove (or rotate) and you can move it to other bikes, but it isn't loose at all. It is very discrete as well, and doesn't take up much room on the handle bars. It is completely mechanical, requires no batteries.Cons: It isn't very easy to read, especially when riding. You'll be able to make out if you're in the 50s, 60s etc. though, which is adequate. (I'm really glad they didn't try to squeeze Celsius on there as well). I thought about $12 was a bit on the pricey side, but that you'll have to decide for yourself.I should add that SOME bicycle computers have temperature as a function, but it is actually rather rare, and the one I had with it as a function was very low quality and huge as well.

The actual product was much smaller than I imagined. It's compact and fits the handlebar well, but i wish the thermometer face was a tad larger. It's very hard to read without magnifying glasses. The arrow to indicate the temperature is printed crooked, and darker color that is hard to read. I hope they improve the design in the future.

This is a great little thermometer for a motorcycle. It fit snugly on 7/8" (22mm) handlebar tube with the rubber ring underneath. Just take your time and snap it on slowly so you don't crack the plastic.Some people have complained about accuracy. It is all about use case - I just want to know how warm/cold it is to the nearest 5 degrees F, and for this job the thermometer is great. Yes, I have to look closely to read it, but this is not a big problem. I don't need to read it while riding. I mounted it up by the throttle grip so it is easier to see.A few people have commented about accuracy. The one I got seems to read about 2-3 degrees above what another digital thermometer shows, and I am happy with this. Different units probably vary slightly. The up side is that this is small, discrete, and there is no coin cell battery that needs to be replaced.My only complaint is the temperature range: -20 to 120 F is a ridiculously huge range. My guess is very few people bike below freezing (32 F) or much about 100 F. A dial with a smaller range would be more accurate and easier to read. But perhaps this is just the range you can get with this particular bimetallic-strip type dial.