Jamie, can't really give you an answer on exact on length as it really depends on the track you're running on. It's not always the best thing to have mega droop.
For the Petit this weekend, I'm starting off with 2 standard AE shims (0.030" each) front and rear. Then depending on track layout/jumps etc I'll adjust as required.
Which track are you trying to get set-up for?
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