Mercedes concludes triple whammy caused Russell's Spa F1 DSQ
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https://www.motorsport.com/f1/news/mercedes-concludes-triple-whammy-caused-russells-spa-f1-dsq/10646453/
https://www.motorsport.com/f1/news/mercedes-concludes-triple-whammy-caused-russells-spa-f1-dsq/10646453/
TL;DR: tyres (from one stop), plank (from eau rouge), sweat (it was hot)
"You get tyre wear, plank wear, brake wear, oil consumption. The drivers themselves can lose a lot. And in this particular race, George lost quite a bit of weight."