[Joe Johnson]

I don't know your exact application, but I would like to caution you if you are planning on using it in your drivetrain.

First of all, bevel gears are very tricky to get right. I know that some have managed to make it work but this is not the kind of thing you want to do lightly (or without a lot of heavy duty engineering support).

Second of all, do you really want a single wheel off the ground to mean that your robot doesn't move?

Look at all those pick up truck commercials. They all talk about limited slip differentials because it is well understood in pick up truck culture that a standard differential is a real pain if you get one wheel with traction and another in the mud.

I wish you well, but I hope that you find another path...

Joe J.