TRX6 Dually Adapter

This is an adapter I made to use dual wheels on my TRX6. They work very well, allows a (approx) 3mm gap between the wheels I used. Wheels/rims are INJORA 1.9 bead locks. I would think it should work on other brands. You need to buy 4mm thread x 6mm HEX spacer standoffs. I used 50mm long and cut to the right length and re tapped the end I cut off. It needs to be flush on each end and then used a 4mm button head screw to attach the outer tire/rim. I used blue loctite for insurance at both the axle and button head screw. I have also included the un-merged version to allow you to modify as needed for your application.

After testing I found that over time the outer wheel would come loose so to stop that I created a backing plate/washer for the inside of the wheel that attaches to the axle and you run 2 - 5mm x 65mm long cap head bolts through the outer most wheel to the back of the inner most wheel and screw it into the backing plate. This locks the wheels together and they can't come lo