Hi Iwan, I run 250 Nat (#31) and have a neck brace. You may be fine with just a headrest on the seat, but i use a neck brace just to help support my neck.
At first it does feel like your head is being pushed down, but when your out on track the headrest does bend backwards slightly and allows you to look straight forward.
It is an odd feeling at first but as soon as your on track you forget about the neck brace. My neck brace is just a foam one that is a U shaped.
As for safety well i'm not sure if it does or doesn't help, but after a race in strong wind's you certainly feel how much it supports your helmet and takes that extra bit of weight off your neck.
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