It's supposed to help with stability at high speed and in cross winds but I'm not sure about the second bit.
Deno Plumley found that moving it back a couple of inches helped even more with stability of the bum end.
OMFG I'm really not with it today, Barry I edited your post with the response above and removed half of what you wrote, I'm a pleb sorry.
Limeymk1 wrote:
OMFG I'm really not with it today, Barry I edited your post with the response above and removed half of what you wrote, I'm a pleb sorry.
No worries IIRC, I mentioned the X1/9, so maybe it kicked off some deep-rooted editing instinct in you.
FWIW, I think the AW11 looks all wrong without a spoiler. But I'm sure it's just deadweight for street speeds.