Hi all,

New member here.

Looking to build a new mountain bike and the FM936 caught my eye, but the geometry is confusing. I'm 5'10" tall, 69" wingspan (haha), with a 32in inseam. So I'm average dimensions except slightly shorter arms. Normal ride medium/large frames, but that reach number is absurd.

My planned use is to race XC, marathon, and general riding near Denver and mountains of Colorado. I race road and XC, which is why I like bikes that pedal really well, but we have gnarly descents in CO too. I plan to put on a 120mm fork for this reason just to add a bit more support for longer days.

I had a 2018 Santa Cruz Blur that I bought when I in size large with a 60mm stem and it felt a bit long and sluggish turning sometimes in switchbacks, but I also didn't really feel like I was getting pitched over the front wheel unless it was hella steep because of the longer reach. I plan to replace my Blur with this bike, which I bought when I was a shop employee. My other bike was a 2018 Specialized Enduro, which had a 440mm reach. I loved how flickable the bike was, but sold it because I just didn't ride it enough, plus I like to pedal.

What size should I pick? Deciding between the small and longish stem or medium with short trail stem.

I could just strip everything off my Blur... but that's a lot of work selling parts and I still end up with an overpriced 2018 frame without the slacker geo.

Any help is greatly appreciated. Included a screenshot of my bikes for geo comparisons if it's of any help. Happy trails!