Looks like the max I can get is 1 degree slacker with the 1 1/8 headtube. That would take me to 67 degrees for an all-mountain, light-freeride bike which is still considered by many on the steep side of the chart. It's a bit of a pricey experiment but I think I'll give it a go if no one else has and hated it.
It's not like I've ever caught myself wishing I had a slacker head angle but you never know until you try, right? I have caught myself wishing for a lower bottom bracket but there's not much that can be done about that without changing the rear shock but I'm totally digging the RS Monarch Plus on there right now.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Angleset on a RFX anyone?