SY Bicycle Speedometer and Odometer Wireless Waterproof Cycle Bike Computer with LCD Display & Multi-Functions by YS

The whole system is weather resistant and durable. Just make sure you don't lose the O-ring that is used to seal the computer when you install its battery. I suppose the same might be true for the sensor itself although I may have already lost that O-ring. When calibrating the system, the manual has a chart that you can use for different wheel sizes. It also suggests measuring the actual circumference of your wheel. I highly recommend measuring the circumference, as the accuracy was spot-on for me when I did it. Also, my wheel size was a teeny bit larger than any entry on the chart. The computer itself, being wireless is easily detachable and small enough to put in a pocket. I strongly recommend doing that unless you stop or park in highly secure areas. That was how I lost my previous bike computer, within 2 weeks.

This bike computer is for my son’s bike. He likes seeing his speed and at the end of the ride seeing how far he went. Good accuracy measuring the distance, And display visible.

Update: After messing with this thing for several weeks I find it to be completely unreliable. It'll read great one day and the next day it will vary between showing zero MPH and 15 MPH. I don't know if the cell phone that I carry interferes with the wireless signal or what but this thing does not work well at all. What I wrote below was how I felt in the middle of my trials. The physical installation is not difficult - tie wraps and such. No big deal. What is difficult is working out the distances along with the particular configuration of your bike. The distance from the computer to the sensor is critical. You get beyond or even close to the 60cm distance from the computer to the sensor and you will get very erratic readings or no readings at all. Same with the 3mm distance between the sensor and magnet. 3mm is about 1/8 of an inch! I have a trail bike with wide forks. That presented an issue in getting the sensor close to the magnet AND also having the sensor not too far away from the computer. I had to try about 8 or 10 configurations where I finally ended up with the sensor tie wrapped on the INSIDE of the fork up close to the brakes (had to keep within the 60cm distance from sensor to computer) which allowed me to get the sensor and magnet within the 3mm distance as well. Once I got those distances happy and figured out how to mount the sensor in the wide fork spacing, everything worked great! Nice features on the computer and you can tune the wheel diameter to get the mileage distance more accurate.

I purchased 2 of these for our mountain bikes. Unfortunately, I was unable to get to the installation completed on one until recently which is past the return period. I don’t think these are at all good for mountain bikes and won’t be able to use them. The issue is this, mountain bike tires are much wider than typical street or road bikes. This makes the wheel’s spokes come a lot closer to the front forks. I was unable to locate the sensor at a 45 degree opposite magnet. I were to ride through brush, a very common situation, that could knock the sensor loose and be smashed into by the magnet or be deflected away from the 3mm gap required by the magnet and will stop reading at all.

Works ok but eats batteries. About every 2 months it’s dead. Looks like it’s off but apparently running enough to kill the battery in the background

My father-in-law recently purchased an electric scooter and he wanted to know how fast he was moving up and down the sidewalk. At times he has a hard time installing small items like this but he didn’t have any issues doing it by himself. He said it’s been pretty accurate, and the battery life has been really good as well. Display size is good and he’s able to read and understand the screen. Good item for a part time speedster.

So easy to install. Took me about 10 minutes. Works great. Saw reviews on hard to see display. I can see my speed and milage extremely clear. For the money this is a no brainer.

Item better than described, fast delivery & great price. Very satisfied.

Easy to install, precise, all the required modes are there including current time. Automatic start/stop. Everything is included. Choice of colors is a plus too. Won't register speed or distance below 40°F, this is annoying! One day delivery.

The price that it was easy to install and was very straight forward to program. You must read and follow the instructions. I use it to mainly keep track of my speed and distance travelled. Also too I like that I can p program for KM or MILES per hour. Oh one other thing no wires, great.

Il est fait ce pour quoi il est conçu mais il consomme énormément la pile. La pile fait à peine 6 mois et pourtant le compteur n'est pas utilisé intensément...

Bought 2 of them and 1 wasn't accurate, got refund

It was relatively easy to install and works well. For me, the fact that it only works in the front wheel is an issue since I often use my bike mounted to the trainer indoors.