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Fair or foul: Gustav Iden won Ironman World Champs with record marathon split achieved with 'illegal' shoes w/ 50mm st - LetsRun.com
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Gustav Iden's record-breaking shoes wouldn't be legal at World Athletics events - Triathlon Magazine Canada
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Gustav Iden wins bizarre first edition of PTO Canadian Open that's full of cramping athletes - Triathlon Today
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World champs taper? Gustav Iden and Kristian Blummenfelt complete 40 km race tempo run 6 days before Kona - Triathlon Magazine Canada
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