Do I need sliding D-rings?

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Technically, you don’t “need” them. They are definitely nice to have with Al80’s, because of their buoyancy changes. But, depending on how much of a stickler you are on cylinder position, even with Al80’s, you can get away with having 2 fixed D’s on each side (4 total).

As for LP85’s (my all time favorite to dive SM with), you can definitely use 2 fixed, for sure. But I wouldn’t go with 1 D-ring, because they start getting sloppy around 1,200-1,500 psi (82-103 Bar).

Some divers really like those rubber rings, so you might consider giving them a chance.
Personally, I use Sump-UK’s sliding D’s (Piranha Dive Mfg. makes a knock-off), but have my eye on Audrey Caudel’s “sideslides nano set” sliding D’s.
 
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After a couple of pool sessions with the LP85s I agree with what many of you wrote; I don't need sliding D rings. The tanks remain perfectly parallel with just using my drop rings. Even at 800 psi.
I've removed the rubber 'sliding' D rings that came with the xDeep bcd. The low profile triangular fixed D-rings I will keep on towards the back of my waste band just in case I notice that clipping my tanks on there when they're very empty would help.

Thanks everyone for chiming in!
 

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