But isn't xo1 only 10 speed?
x1-xx1 are all 1x11 specific.
Cam is sorta right... x01 actually comes in 3 speeds..... 11, 10 and 7 (yes it comes in 10 you aren't reading wrong)
after some reading... I've finally decided to go SRAM 11spd over shimano (yes the back cassette won me over, along with wider range )
I spent hours reading and shopping for the cheapest price... with price and weight* in mind, it looks like I'll be going x01 cassette, either a X1 OR XX1 mech (only 4g's between the X1 and X01, so no point getting x01 given its +$37 difference for 4g, however more weight savings (30g~) going with the carbon XX1), as for shifter..... I'll opt for X01 (X01 an XX1 are IDENTICAL shifters internally, minus the carbon cover/lever of the XX1, no mention of weight, but x01 comes in at 91g)
Hope Freehub: as for XD free hub.... after a few hours of digging I can confirm you need a specific drive side adaptor if you plan on running 142x12 on the Hope XD free hub. it is slightly thinner than the regular x12 spacer... cheap fix ($10~ CRC)
with my research I also came across something interesting... did you guys know SRAM updated their type2 clutch?..... to Type2.1
no real mention of difference/improvement except 'revised roller bearing to reduce chain slap, and revised lock button', google sheds no light either !
* weights I've quoted are based of sram site..... googling actual weights shows differences (ie. XX1 mech coming in 20g~ heavier than the quoted 220g)