This device is functional, but a little convoluted to install and configure.There are quite a few components including those that go on wheel spokes, the front fork and handlebars. It measures wheel rotations to calculate distance and speed so you need to determine your tire circumference--I measured mine directly using a technique supplied in the instructions.The fork/spoke components have to be super close (to insure accuracy) which seems kind of hairy since the the spoke component is attached to a single spoke rather than two spokes like a reflector. Configuration is a little wonky, a common issue when configuring many options with only two buttons on any similar device.If you are handy and patient, it's a good choice. If you are looking for a plug-and-play situation, this device is not for you
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