I've gone down to a 36 mm ring and I'm still growing behind it.

Obviously I don’t what size you are but be careful about going too small as far as the ring goes. You’re going to grow behind the ring of the ring is to small because all the lymph fluid/ blood flow going into your penis is coming from behind the ring anyway. So if the ring is too small plus the cage being small all the buildup is going to happen behind the ring anyway. The smallest ring you should go with is one that you can slip a finger between yourself and the ring. As far as the cage goes, try to find a length and width that is close enough to your flaccid size. Once you find a comfortable fit, you can start to downsize your tube if you’re looking to make things appear smaller. Typically trying to cram everything into to small of a cage right off the bat could cause you some physical damage.

 

I don’t think you will stop the growing behind the ring because the swelling has no where else to go.

 

i have not seen rings that less than 36mm but my metal ring was maked smaller by Etsy for me.

 

The diameter has little effect on preventing erections. One thing that allows them is a too long tube.

The other thing that allows it is a loose sac. It's a 'ball trap' device, so if your scrotum and vas deferans are long enough, then your testicles can go a long way up allowing the skin to go back and the base ring forward, before the ring stops the extension.
If that's the case, then you could try wearing a ring or collar around your scrotum. That will take up the slack skin that's allowing the erection behind the ring. Put it this way, if you have room to wear a scrotum collar, then you likely need it to prevent your problem.
But don't have too small a base ring, you're trying to stop length, not width, and if it's too small a diameter then that's when it can become painful and/or cause harm.

 

wow... 36mm... i'm still around 43mm after all these years.

 

Sometimes the key is knowing that you are flaccid 90% of the time. Your cage should fit you properly so that you forget you are even wearing it. When you attempt to get an erection all that changes and there is not much you can do about the build up behind the ring. That is just what happens.

 

I agree. I would note a couple of things....When I started using my HT V2 about 5 years ago....i used a small V2 tube with a 45 mm ring. After a while....I downsized to a 40mm ring which was fine until i started to slip out during showers. Although I don't use the V2 much right now...I have downsized to 36 with "some cages."
Since starting wearing a chastity cage I have first noticed and then "felt" a "need" to keep trying smaller and flatter cages. Perhaps that is the "addiction" element in wearing a chastity cage.
I have noticed that sometimes it is the combination of the "ring size" and the "tube size."
So with most of my cages now I use the 36 mm ring option....but there are still a few of the cages that I use the 40 mm ring.
Bottom line is that I am a believer in "shrinkage" with extended chastity use....it just takes time.

 

I would also note that the male body "learns" that to avoid the pain of having an erection to stay "limp." Erections do still happen but with time...fewer