Bike Computer, ® Wireless Bicycle Speedometer Bike Odometer Cycling Multi Function Waterproof 4 Line Display with Backlight YT-813

I was most impressed when installing this bike computer. It has a great selection of functions and is fairly easy to read. The wheel size info is a bit confusing, and could probably be improved. For the price this is a great deal, the wireless works perfectly. I would recommend this unit.

No me sirvió, no funciona, pésima compra

OK... it is a 'Five Star' rating in part because give me a break... a wireless cycling computer with calorie count and thermometer for around 16 bucks? That has to count for something. So the not-great stuff first... it has three menus of stuff to select from as far as the display goes and what you get on each screen is what you get. You can't customize the lines of data that get displayed. So for example, I would like the speedometer with the thermometer, but I can't get that. Instead, if I want to know the temperature I have to toggle through the second screen to the third screen to read that. That screen displays 'Maximum Speed' in place of your current speed, which is pretty useless for me... it might be nice to know after a ride what your fastest speed was... it just isn't anything I need to know on an ongoing basis. Secondly, the instruction sheet is very detailed, very involved, not super-well-written and a bit confusing. When you're setting up various lines of display, you're not always sure what it is the line you're working on represents... if you start reading the instructions, you'll eventually figure it out... but by then it has timed-out of the set up mode and you have to start over again. Third, you can't cram in lots of lines of data in a unit this small without the font being on the small side. Again, it isn't the unit's fault that the lines are as small as they are, but it can be annoying. Good stuff... the back light feature works well. There are a number of different settings, but I haven't set up anything different from what it came with and you push 'Mode' at night to get a good 3 seconds of light. And it does light up the whole display despite originating on the left side of the unit. The thermometer works! I used to have a 'puter by Planet Bike that was a wired unit that I bought specifically for the thermometer and it was terrible. I'd leave my house on a day I knew was in the 30's and it would read 74 degrees or some-such and by the time I got to work some 25 minutes later it would read like 56 degrees. This one seems to work well and in the moment... you can program Celsius or Fahrenheit... also kilometers or miles for the other measured settings. Set up is straight forward and easy. Honestly, all the sturm und drang people are raving about in the reviews has me flummoxed. I mounted mine on the left side of the bike, made sure the magnet was centered on the wheel sensor, turned it on and it had a pulse right away. A tip: I didn't have to do this because the magnet on this unit is pretty strong... but you can buy the tiniest of the neodymium magnets and attach one or two to the wheel magnet to increase its strength and range. Then you won't have to adjust the distance to the sensor to within a micron of its life. The dimensions for these craft magnets are like 2 mm diameter and 1 mm thick. Accuracy of the speedometer... yeah, I'm not sure. It seems accurate based on how far away a destination is and the trip distance, which seems to correlate well. The instructions do give you some common measurements for different diameter wheels... it doesn't have 700 x 25c however and so I can't see how well my measured / calculated circumference 'stacks up' with their estimate. The calorie count feature keys off your mass in kilograms with one pound = about 2.2 kilograms. Personally, I think any and all calorie count features are pretty worthless. How fast you're going and therefore how many calories you're burning just has too many variables to account for. Durability, water resistance, battery life, etc. are all unknowns at this point. If these wind up being 'bad' I'll post updates.

I like to have the device on my bike for records on my performance. Buying such things must carry with it clear messages on the installation and operations of the device. If this becomes blurry then the purchaser will not be able to use it and feel unsafe to purchase such items over the online portals.

Work flawlessly. Just don't enter the tyre circumference values that are given in the manual as they are totally off. Instead, measure the circumference manually and enter. The display is easy to read and buttons are user-friendly. The backlight is very useful for night riding. The unit fits more securely on the handlebar than on the stem.