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Which is the best length of spike for cross country on muddy terrain? And what about dry weather? What is the maximum length of spike allowed on the track?
The length of spike you should choose for your shoes depends first and foremost on where you are running: on an athletics track or on a cross-country course?
Your choice should be guided by your discipline and the grip you need, keeping in mind that your sport may have some length restrictions.
Your choice should be based first and foremost on whether the terrain is dry or slippery, muddy or hard.
On synthetic tracks, you will usually have the choice between 6 mm and 9 mm spikes. 9 mm spikes will provide better grip of course, but you are more likely to feel them underfoot, which may become uncomfortable, especially on long runs.
9 mm spikes are generally sufficient and will provide you with extra comfort, especially on long cross-country runs.
For the most efficient push-offs, you could wear spikes up to 12 mm, which is the maximum length allowed in competitions.
On muddier ground, you will be looking for excellent grip with longer spikes (up to 15 mm). According to your stride (heel or midfoot strike) you could try wearing longer spikes at the front for an optimal compromise between grip and comfort.