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Brooks hasn’t yet released a comparable track spike, which is why Kerr was allowed to wear a shoe from a competitor.

Since the arrival of thick-soled, carbon-plated road shoes, and now their track spike equivalent, long-standing records set by the sport’s all-time greats are being obliterated, to leave historical comparisons difficult, if not impossible.

“I took it seriously, and I approached it as I would a track spike or a trainer. What’s an attractive heel-to-toe ratio? Let’s take a really attractive shoe, and can I make it feel like a sneaker?”