I have a 160mm Lyrik on mine and three other AM9 owners I know are running 160mm forks too.
@hamishthecat – I can’t recall where I read it (Ben Pinnick on here maybe) but I thought the latest version of the frame had met the testing criteria for 160mm forks, so I would have hoped the warranty would be changed to reflect this. There’s no mention of 160mm on the website though, and all of the fork options are still 150mm, so I’m guessing the warranty is still officially 150mm.
@ifindoubtflatout – I opted for a lighter spring. A couple of spring calculators had me around 350lbs but I already knew that I needed to run more sag to get the best out of the air shocks I tried (RS Super Deluxe & CCDB Air), so I also bought a 325 spring and that’s the one that worked best. The 350 was just too firm in the second half of the stroke, and even with the lighter spring fitted I still didn’t need to add much LSC.