I'm thinking about adding a 90mm ski to my quiver next year (to allow me to ski more of mountains I'd go to on vacation, and even the occasional local deep day).
However, I may think twice if carving on a 90mm ski is really as bad on the knees as people say it is.
Just wondering how painful/dangerous it is.
1). Go wider. It doesn not hurt- in fact it's quite the opposite. Using advancements like tip and tail rocker, reverse camber an the like, you will expend far less effort in making turns in powder. Sure, fatter skis increase stress on joints when skied on hardpack, but why would you be doing that? You already have race skis so that shouldn't even enter your mind.
2). It does not hurt to ski rockered skis in pow, and I'd like to e-punch whichever fossil said that out loud.
3). It hurts to ski carvers in powder to me. Not physically but mentally- like OH MY GOD WHY AM I DOING IT THIS WAY, THIS IS STUPID. To me, buying anything sub-100 waist on a pow day would be like buying a Model T for long range road trips. It's just not the right tool for the job and technology has given us many options better suited for the conditions we seek. In my humblest opinion, I'd say keep your carvers for the hard days and for when the stars align and the pow is deep, go with something with a fun shape and all the bells and whistles. Examples of a perfect all around fun poppy slasher would be perhaps an Armada JJ, Atomic Blog, PM Gear Lhasa pow, Whitedot Director, Rossi S7 etc. Something around 105-110 in the waist, a slight amount of camber or flat, with tip rocker and a section of regular sidecut underfoot for control on harder surfaces.
But that's just my opinion, as I don't think you'll notice much difference witha 90mm ski. I know I was let down when I bought a 90 thinking it would give me a better or different experience in pow. Seriously. Buying an honest-to-god pow ski is one of the greatest things I have EVER done for myself and I will NEVER not own one.
Best of luck and don't hesitate to ask me something directly if you have a question about something I said.