they’ve stopped making them. lots of threads about it on the mtbr yeti forum, basically they couldn’t sell enough to justify keeping it in the product line, even though people like Graves will still be racing the SB66 this year. ASR5 is also deceased.
The SB75 ends up with the same travel as the ASR5, but it’d heavier than the (already heavy) SB66.
They’ve left themselves a weird and undesirable lineup, IMO – ASR5 is one bike I was always very tempted by, just looked a fun bike, light & slack. Dunno who the SB75 appeals to – if you want an Enduro bike, you can get a Bronson which is similar, lighter bike with more travel, or if you want a trail bike, a 3010 is the same travel and wheel size, but miles lighter.
A proper, 150/160mm SB75 and a 650 version of the ASR-5 would have made so much more sense.