pic: Team 100 Prototype Base

[MrForbes]

Originally Posted by Hachiban VIII

Last year's drivetrain was very reliable and cheap, but it didn't turn well and was infamously tippy. Hopefully this new design will be just as reliable, but one heck-of-a-lot more stable

Part of the tippy issue is the wheelbase and wheel size, another part of it is where you put the weight on the robot. Make the frame heavy! that's where you want weight to be, and it will force you to make the rest of the robot (the stuff up high) lighter. Don't be afraid to make the frame of a very substantial material and section design.

(also don't be afraid to ignore this suggestion, most everyone else does!)