Every track surface has its own optimum spike length. Current all weather tracks (rubberized) are built for best results with short (1/4" or 8mm} spikes and will not allow athletes to use longer spikes that will damage the expensive rubber surface. On wooden tracks a shorter spike might be advisable (so it doesn't get stuck in the wood, slowing the athlete). On a dirt track, much longer spikes will work better though it still depends on the kind of dirt surface. A clay surface might still suggest a shorter spike than a more granulated or rocky kind of surface.
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