The magnet assembly attached to the spoke is made of plastic and does not adhere securely to the spoke. It turns and slides. I am returning this item. I've ridden a bike all my life, now I'm 72 years old. I have rebuilt and repaired bikes many times; I have a professional set of detailing tools. My shop is next to the bike shop. I distinguish good from bad quality. This bike computer is of very poor quality. You can get this thing working for a short time, but it won't last long - it's junk.
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