may seem like an odd question, but why would they make 3 types of the same arm?, i cant see it making economic sense, u have the plastic one for the db01, why not just list the 501x arms as an upgrade instead of making a specific db01 hi traction arm, unless theres something else im missing, anyway im not too worried, i have the high traction arms coming as spares, i dont break arms often running 17.5
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