[frizzen]

Different tires will run differently with traction changes.

For cardboard, with turns you'd probably want about the stickiest tires you could get. (bit racer / hot wheels racer - orange tires) But, as you pick up dust off your track, they loose traction.

I can't really tell you what's best to run for a "7' cardboard track" unless I know what kind of driving you'll do.

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Are you just doing hole-shots? (sticky rear, hardest you can find front)

Are you taking corners all one way? (usually about moderate grip, you don't want traction rolls)

Is it a road course? (usually the stickier the better)

Is it a rally course? (depends on the surface conditions)