Needle stuck and registered incorrectly (way too fast) when I installed it. I took the head completely apart and cleaned all the parts. They seemed covered in corn syrup. I cleaned them all in soapy water (all plastic parts) and reassembled the head. It seems OK now. I swear it is a leftover from the 70's when I had one on my little schwinn 20". It is IDENTICAL to the one I had. Works well now, and cable is tough enough to stand up. My son had a digital one, but the front wheel spun around and snapped the tiny little wire, so we are giving this a shot as I dont want to spend 50+ on wireless versions. 3 stars