pic: Conceptual bumper mounts, Universal Chassis

[MrForbes]

Another thing....depending on the game, and how your robot plays it, you might be able to put a full crossmember at each end of the robot, sticking out all the way to the side bumpers, which simplifies bumper mounting.

And the added mounts on the sides near the center wheel don't need to be bolted onto the bumper, they could just be supports that prevent the bumper from being deflected in towards the wheels.

[Eugene Fang]

Originally Posted by squirrel

Another thing....depending on the game, and how your robot plays it, you might be able to put a full crossmember at each end of the robot, sticking out all the way to the side bumpers, which simplifies bumper mounting.

Well, if the bumper is going to be there anyways, that crossmember wouldn't do any harm (because the bumper would be blocking anything the crossmember would, and it would be stronger with the bar there).

On the other side of the robot, though, as Squirrel said, might have to be kept open to allow game pieces to move closer to the robot.