[RCP57]

Tires are very soft if the foams are removed. They are 1.9 tires and I have installed 2.2 foams like I did in my loader tires. That gives them an almost perfect squish. You could add a little weight to them but filling them with lead would be too heavy. I think pushing this model up to 10+ pounds is a bad idea. Making it a lot heavier will no doubt aid traction but then you would need to add more to the front or it would push the roller sideways in a turn. Add more there and the steering servo and drive motors would be too weak. A little larger battery and a few ounces of weight will get it going a little better without taxing the drive train. It got great traction with a standard 7.2V pack so I will adjust the weight of mine to roughly match that and call it good. You have to keep in mind that it is just a plastic toy and not a full metal machine.