Joined: Dec 2011
Posts: 2,519
Likes: 18
From: Fort Worth, Texas
Bikes: 2000 Bianchi Veloce, '88 Schwinn Prologue, '90 Bianchi Volpe,'94 Yokota Grizzly Peak, Yokota Enterprise, '16 Diamondback Haanjo, '91 Bianchi Boardwalk, Ellsworth cruiser
Usually the sensor to magnet distance is the culprit, but you've already addressed that. Is it a wired model, with contacts between the computer and handlebar mount? Try cleaning the contacts on both the computer and mount. Or you may just have a faulty unit.