What do you mean by wears fast? I run a really soft rear end & get maybe 3 race days from mine, depending on how bad the track gets blown out & how much I run on play days on a dry track. I only ran my mugen in race conditions(wet track & before the dirt deteriorated) & 5-6 race days was not uncommon. Its not usually a wear issue now ,its from gouging a rock or really hard pot hole edge that pulls the front of the rear skid away from the chassis then packs it with dirt. But at $2 a piece I find 3 race days & a play day or 2 super good wear,I gues its all relative as the alum ones I had on my losi lasted longer at $20 but the one time it cought on a rock just right it was real ugly & cost me a race & a bulkhead & 2 screw & ended my day & that was when losi had no bulkheads in america so I'm kinda biased.