going off the ledge

[greencactus3]

today we finally got our wheels mounted. (whew, took a while). i tried pushing the robot... basicly a frame with wheels... two of them mounted only temporarily. well anyways, when i pushed it off a 6 inch ledge, it bounced like crazy for a couple feet. really. a couple feet!! in the playing field, we'd be crashing against the fence. and im pretty sure our robot, when it gets to be self propelled, it would be faster than the speed i pushed it off at.
oh yeah, forgot to say, we're using the kit 12 inch pneumatic tires.
for now, our robot isn't even close to 130 lbs. haven't weighed it but guessing its still less than 60lbs. im sure adding weight will help it a bit, but is there any really good ideas how to stop it from bouncing around?

everyone, it would probably be a very good idea to take care that the electronic stuff won't get loose. with speed, thats alot of pounding on your robot.

yeah, and ive considered releasing a bit of air from the tires. but im worried the tire might come off the wheel. is that possible? if it is, is there agood way to make sure it doesn't happen?