I personally wouldn't modify the tire because it will affect handling. I would say to just slow down on corners to help reduce rollover. You could also lower the suspension a little, and/or decrease camber so the edge catches less. I wouldn't mix tires unless they are the exact same size otherwise the CD will have to absorb the difference in wheel/axle speeds.
Ok, but my truggy is using aka ibeam & city block it's great. But it's too costy to ship them to Singapore. Proline is avail in Singapore that's why I want to try mix & match if possible.
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