I have no idea about Roka sizing but I'm 6'2" and fit into small in a lot of brands except Kiwami. I have chicken arms.

That said, I fit to the sleeves, which apparently the "Gen II Elite Aero Sleeveless" tri suit does not have, in which case it's probably not aero so don't get it.

My guess on breakaway front zipper is that it's easier to pee and also for the zipper tab "up" is breakaway and "down" is locked.

Noticed Roka has tall sizes... hope you're listening Kiwami and Scody!!!

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I'm more or less your weight but 5 feet 11 inches tall, I went by the chart and picked an S. Ended up with an MT because S and ST were way too snug.

Editing to precise that mine is a sleeved suit

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May I ask your chest and hip size?

1. You can pee without unzipping the front. Very nice .

2. I’m 6’0” 195lb wearing size XL. Fits very well.

3. Only complaint is that there are some glued-on rubbery strips at the ends of the sleeves on the sleeved version to keep the sleeves from riding up your arms. Both of these came off after about 7-8 uses. That’s machine wash with air drying. Contacted Roka and they sent a new suit.

Chest is 85cm, waist 80cm, hips 90cm

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I'm 6'2" and race at around 153lbs... I wear a Roka Gen II (sleeved) in ST. Fits great. Tight, but great. I pretty much need ST sizes. Same reason my wetsuit is Zoot, since it was the only one at the time I could find in ST. Could I wear the Roka in M or MT? Sure. But I'd be worried about an aero penalty and I'm not uncomfortable in the ST and it's not restrictive.

I'm exactly your measurements and the Medium is what I go with. Bought and raced in a small, and did not work for me so went on a Med, raced IM Wisconsin with no issues....comfortable all day.