Like sendler I like to ride year round. Tires, fenders, lights on a mountain bike are common here. I use a full face Bell motorcycle helmet with a flip up visor. I have tried various wind screens and now I make my own from 4 mm Coroplast. I cut a sheet 24 in. X 44 in. I make cuts in a radial pattern from a point just below the center then overlap the segments. I poke holes through the overlapped material 3/4 in apart and secure the segments with zip ties. Most adhesive do not work well on this plastic. I mount the shell to the base of the head tube. I cut slits to an opening for the head tube and front brake cable. If I need to stabilize the shell more I make a hoop from white PVC tubing or tie two cords between the the upper part of the shell and the center of the handlebars. The fact that the shell mounts to the frame rather than the steering greatly reduces instability from cross winds. Other materials could be used.
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