I have SQ Labs 611 Ergowave active, which is virtually same saddle as 612. My sitbone width is 110-115mm pending on who measure it.
According to SQ they suggested 140mm version. Pains arrive if saddle is too shallow in width and one step up causes no problem when it comes to Ergowave.
Sure, i have it, but i really don't like it.
I find that the relief zone is too shallow and you can't move because the saddle is really not comfy if you do.
All in all, i would never recommend this to anyone.
Pro Stealth looks nice, but they should have skipped that tail up in the rear. It kills it for me as i move back and forth.
Who specifically suggested 140mm version? Based on your sit bones width, 140mm is bit wide for you, unless you sit upright on your commuter/urban bike.
Per chart below, you take your sitbone width and add extra width (e.g. +2cm
= 115mm sitbone width + 20mm
= ~125mm saddle). If your setup is aggressive for racing, you should take a look at 130cm version. Relief channel is deeper as you sit far back, away from the nose. If the saddle is too wide, you may keep moving towards the nose, which defeats the purpose.
No on the contrary, i can't find comfort if i don't sit very much as far back as possible.
There is zero problems with 140mm talking how i am seated. Who i talked to, it was the guy who handles fitment questions at SQ labs.
I also rode this with TT shorts and two different bib shorts.
What i don't like, is the nose. I don't like saddles with typical standard noses.
For me, they put pressure on perineum.
I have spoken alot with SQ and i also have their fit kit, so i am well aware of this suggestion sheet above.