Giro Helmet Clip Post

What

Snaps into the receiving visor (peak for our friends in the UK) clip on a Giro bike helmet.

Why

My new Giro Radix helmet came with a remarkably short visor. Even though the longer visor from an old Bell helmet fit the Giro clips, Giro and Bell use a different angle for their mounting clips and the Bell visor pointed up at about a 20 degree angle.

In case my experiment failed and I needed to fall back on it, I didn't really want to cut the Radix visor up to use it's posts.

How

These posts will work best with either quarter (6.4mm) or half inch (13mm) double sided tape.

The half inch posts provide a more solid mounting point if you have the room for them. I recommend a high performance 3M or similar tape.

Epoxy might work, too, but I would avoid it. Even the fumes from some epoxies can damage the foam used in a helmet.

Printing

Print flat on the base* in PETG. I used .12 layers with 100% concentric infill.

Like all of my files that interface with mating parts, should be sliced with Cura's Slicing Tolerance set to  “Exclusive” (or equivalent in your slicer of choice)  for best fit.

Preparation

If using another visor, carefully flush trim any protrusions until you have a flat surface for the new posts.

Take a few moments to figure out about what angle you want the new visor to sit at. Some painter's tape can help with temporary placement for testing. It doesn't need to be exact, like the factory Giro visor, there is room for some adjustment after installation.

Make note of some reference so you can duplicate it again. I looked at the helmet/visor side-on and mentally noted the angle between the lower edge of the visor and the front lip of the helmet.

In retrospect, a few strips of painter's tape to outline the back edges of the visor and a piece holding the center at the top of the visor would have allowed a more precise installation.

Installation

1. Snap the posts into the clips on the helmet. Align them to the same angle.
2. Clean the bases of the posts and appropriate areas of the visor with isopropyl alcohol. (On the posts, use only a small amount applied to a rag. Keep chemicals away from the helmet's foam as much as possible. Or clean before installing and install while wearing gloves so as to avoid skin oils transferring to the posts' bases.)
3. Cut two .6 inch (15mm) long pieces of tape of the appropriate width for the posts you are using. (The post bases are 16mm (a little over a half inch) long.) Don't remove the backing yet.
4. Apply the tape to the posts' bases, then remove the backing.
5. Carefully align the visor's sides at the proper angle and press them to the tape. Go slowly, if you did a good job cleaning, even a light touch to the tape may not easily release again. Most tapes of this type will form the best bond with a few minutes of firm pressure.
6. Remove any tape used for alignment and enjoy your new visor.

* I experimented with a version that printed upright on the short edge to better align the layer lines and was modified to not require any supports to do so. It wasn't enough stronger to be worth it.