Dual wheel adaptors

[Marcle]

In a different thread, some guys have been asking about my dual wheel adaptors, so I thought I'd post some photos showing the actual design.




The following is a basic 3D image of the adaptor


View end on


View side on


The adaptors have been made from 70mm (2.75") A/F hex bar, chopped off to 255mm long (10"), then joined with some 6mm (1/4" by 150mm (6") flat stock. The ends of the hex bar have been drilled and tapped to M14. The wheels are already pre-drilled, so after making up the 6 lengths of hex bar, bolt three to a wheel to ensure they're in the correct position. Test the second wheel on other end, but don't fix, put to one side whilst welding in position the 150mm flat stock. Do remember to tack first just incase the welding pulls them out of position.

[Marcle]

Just a thought, the reason for the 150mm flat stock, instead of perhaps some lengths of 25mm flat stock is to prevent any twisting of the adaptor if the outer wheel has more grip than the inner wheel.

I saw a similar idea on a 4x4 than someone had made without the flat stock and the pillars/hex bar just bent over. Basically lack of strength.

[willi67]

Thanks for posting! looks like its held all right

[Marcle]

I took the outer wheel off last weekend to fill the tyres with ballast, so managed to get a photo.

I thought the hex sections were solid, however they seem to be hollow hex tubes with end caps welded on.

[willi67]

wow .. that's massive, if those hex sections were solid they would weigh a bit! I don't remember seeing hex sections, solid or hollow.
I checked my wheels and the centre section is flat so this mod could be done at home with just a welder, but I would make the flat sections the same length as the hex .. ha ha

Thanks for that.