Originally Posted by Kirby Masterman

Chuck the medium flex arms on if your in 'stock 27t' or above
if your in anything below that, the extra flex arms would be a great choice because the car isn't under as much stress for the geometry to go out.
And if your really keen on going fast, use the Mi2 c/f arms, but they are quite brittle.

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These are my base Set-ups for this year,

Keilor
Smooth, Low grip, both open and tight

Templestowe
Bumpy, low grip, tight