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Is there any explanation as to why the skinsuits were different?
Hannah Barnes and Hayley are clearly wearing different suits... Hanna's has the ribbed shoulders etc and looks like a bioracer suit rebadged in GB/addidas colours, while Hayley's suit looks more like a typical addidas suit and notably different to her national champion's trip-suit.
I'm sure the addidas suit isn't slow (and it looks like there are some trips on the upper arm) but it must be frustrating for both of you to have put so much effort into optimising her position in concert with her custom trip suit only for her to race in something that is presumably slower.
I'm not implying that it would have made a huge difference to the outcome, but if riders are obviously able to ride in different suits, why wasn't Hayley in a tripsuit?
The setup thing was only part of it, heat affects riders in different ways - a small rider putting lots of power will have issues dissipating it because of a reduced surface area. The more power you put out, the more internal work - it'll be >1000w worth of internal work over the course of the event which is a lot!
Tall rider big power isn't ideal either because w/kg doesn't scale with surface area so the best combo for hot races is small rider low power (eg. Neben).
We're all dead chuffed with Hayley for making it to the Worlds when getting selected and riding for GB is not an easy task. Hopefully she'll get another chance next year too (and beyond)