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by Andrew Douglas
This page shows how I mounted a carbon M5 tailbox on a Wishbone Classic. It also describes how I made my headrest.
The box, since it is designed to fit a true lowracer (which the Wishbone is not) requires some modification in order for it to fit the rider properly. In particular, the front edge of the box is at a more laid-back angle than the Wishbone seat is capable of achieving. As a result, there are inevitable gaps between the rider and the box. So, some sort of gap seal needs to be fabricated.
Shown below is the box in its current configuration. At first I assumed that the leading edge of the box should be at the same level as the seat back, but this put the box clear of my shoulders. I subsequently remounted it so that the tops of my shoulders fit just inside the box. As you can see, even after this was done significant gaps remained, which are filled by the yellow foam pieces.
This shows a clearer view of the yellow foam. It's Plastizote, hand-formed after warming it with a heat gun. This technique, along with a source for the foam, is thoroughly documented on the John Tetz foamshell page.
Shown below is part of the mounting scheme... the bottom of the box has a long slot in it to clear the rear wheel, rack stays and seat stays. At the very front of the box, this slot is just a split in the box. Along the lower leading edge of the box are four small holes, two towards the middle and two about halfway between the center and the outer edge. Pieces of braided nylon cord are run through each hole and tied together (these are the blue strings at the base of the seat back). Together, they both hold the box tight up against the underside of the seat and keep the sides in close.
The next two photos clearly show how far ahead of the seat back the box is actually mounted.
Here the box is shown inverted. The only mounting structure is a simple piece of bent aluminum tubing. Since the box only weighs about one kilo, additional structure is not necessary. The tube is held to the sides of the box's headrest with a pair of plastic conduit clamps.
This shows the seat back. The funky gray foam chunks are to give it more of a curve than it originally had. Newer Reynolds seats have this curve built into the seat... when this bike was built George was still making the seats a bit flatter. Note the seat side tubes... these are just the right size to receive the aluminum tube inside the tailbox. Mounting the box consists of spreading the front open and sliding it on over the back of the bike, plugging the support tube into the seat back, and tying up the four pieces of cord. It takes about two minutes.
This shows the headrest I fabricated out of an aluminum Slow Moving Vehicle sign and aluminum tubes. It's carefully sized to fit into the nape of my neck... it does not impinge on the back of my skull at all.
The original version of the headrest had the tubes mounted in front of the plate, but the pressure of my neck caused the rivets to pull out. So I simply mounted it with the tubes behind the plate, so that the pop rivets are not stressed.
The headrest fits into the same holes used by the tailbox. Simple, no muss, no fuss. Note the way-cool Marvin the Martian bowling towel!