if your running m4 tires don't expect them to last long.. astro has massive grip and you'll do nothing but run those down. may consider running harder compound (m3).
in 4wd the fronts will wear a faster rate, regardless of the brand. the contact patch is smaller, and they recieve the same amount of drive, and they take friction of the turns (increasing wear)
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2WD
Kyosho RB6
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