AbiliTTV

I am building a quad handcycle - I will use the back triangle from 2 low end mountain bikes. So I will have a dual drive one for each hand.

I have seen and known about cable splitters. I also know that many styles of cable doublers. In fact I will be using brake levers with dual cable connections. So I can run the front brakes to one lever, and rear brakes to the other lever. So the brake system is handled.

I would like to run the rear derailleurs 2 to one shifter and the front 2 derailleurs to the other shifter so that shifting gears are in sync.

I can not seem to locate a product that allows this to happen. I realize most quad bikes do not employ 2 drive trains like this. They tend to use one wheel, and or a differential to split the power to the rear.

Has anyone seen or know of anything that can help?

Thanks,
Jon