SIM, but the inner diameter of the comfort insert is just under 2.5 inches. I normally use a 2.25" tube.
Second thought.
I recommend you to feel the difference, it's hard to explain. But there is a diffrent kind if expansion with a wide Bathmate pump in comparison to a narrow Bathmate pump. The shape of the cylinder and the bellow do something with the expansion.

It's like there are more expansion at the mid-shaft, and more suction at the base. But I don't know, It may just be the wider cylinder that are the key to force extreme expansion.

I was going back and forth between a bigger, and a smaller Bathmate pump in order to force expansion throughout the shaft.
 
Logically, I don't see why it would limit meaningful expansion. If you expand to fill the insert, the pressure would be exerted on the exposed tissue instead. And don't you want uniform expansion? 2.5" diameter insert allows for almost 8" girth. I am sure there is some equation to figure out what the pressure is being exerted on the tissue. When less tissue is exposed, you'll feel more pressure proportionately on that.

I do wonder whether more skin sucking up into tube makes it easier to expand. Think about it, if the skin is taut and foreskin is pulled down, expansion is stretching the skin and limited by the elasticity. If you have more skin available inside the tube, it is less restricting. I noticed this very early on in my initial experimentation with the bathmate. I tried pulling the balls straight down so the ball skin was taut across the base of the tube. And when I was pumping, I could feel this discomfort, which I was pretty sure I identified this as the skin on the underside of shaft stretching very tightly. And so I tried to let a little skin into tube and the expansion felt better.
 
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I could never use the comfort insert due to my upward curvature and slightly to the right curvature. I got stuck on the insert pipe when I was shorter, it did not work for me. I suppose I recommend it because it worked for me.

But either way if you limit skin expansion, how can the internal tissue expand to the max?
Maybe the suction at the base (without the comfort insert) do something for growth?
 
Logically, I don't see why it would limit meaningful expansion. If you expand to fill the insert, the pressure would be exerted on the exposed tissue instead. And don't you want uniform expansion?
Well, there is a science behind that. Brother SIM discovered it by chance and couldn't explain it properly. The reason why the larger base, where the Bathmate's design into a near conical elliptical form, is due to the unique science behind the expansion to base first towards the glans design. Most cylinders are uniform all the way from base to glans. Think about the base expansion. The moment the base is restricted due to skin and fluid build up at the base, less and less blood can get in no matter how hard to kegel and erect. This is especially true during your fatigue period after XX amount of length work and XX amount of girth work. The expanded skin and fluid at the base choke the blood vessels, or known as venous constriction. By having a large base, the blood can further be promoted to flow at peak efficiency without the venous constriction, even with the skin and fluid being jammed into the base openning. So, the larger the base openning, the more you can. Growth because of the ability of blood flow without restriction, or constriction. This is why pumpers have different cylinders bases on the phase of the pumping. Small first, then medium, then large.

2.5" diameter insert allows for almost 8" girth. I am sure there is some equation to figure out what the pressure is being exerted on the tissue. When less tissue is exposed, you'll feel more pressure proportionately on that.
You want the internal tissues to expand up and beyond your intended size. 8in on the outside doesn't mean 8in on the inside. You have to account for all the expansion throughout the penis, be the tissues, the chambers for blood, or the epidermal that holds the fluid. 8in expansion now, with cementing over a long period, will get you 8in. 8in expansion with short term cementing will yield to 7.2 to 7.5in. this is why the best measurement of growth is based on the corona (the glans rim) growth. Tissues expanded and rebuilt around the glans is the indicator of how fast you are growing. The glans tissues is the hardest to stimulate the growth. But once you see the glans grow, you know the rest is coming in nicely.

I do wonder whether more skin sucking up into tube makes it easier to expand. Think about it, if the skin is taut and foreskin is pulled down, expansion is stretching the skin and limited by the elasticity. If you have more skin available inside the tube, it is less restricting. I noticed this very early on in my initial experimentation with the bathmate. I tried pulling the balls straight down so the ball skin was taut across the base of the tube. And when I was pumping, I could feel this discomfort, which I was pretty sure I identified this as the skin on the underside of shaft stretching very tightly. And so I tried to let a little skin into tube and the expansion felt better.
Nope. More skin in the tube means less growth overall. Constriction and restricted flow.
 
Well, there is a science behind that. Brother SIM discovered it by chance and couldn't explain it properly. The reason why the larger base, where the Bathmate's design into a near conical elliptical form, is due to the unique science behind the expansion to base first towards the glans design. Most cylinders are uniform all the way from base to glans. Think about the base expansion. The moment the base is restricted due to skin and fluid build up at the base, less and less blood can get in no matter how hard to kegel and erect. This is especially true during your fatigue period after XX amount of length work and XX amount of girth work. The expanded skin and fluid at the base choke the blood vessels, or known as venous constriction. By having a large base, the blood can further be promoted to flow at peak efficiency without the venous constriction, even with the skin and fluid being jammed into the base openning. So, the larger the base openning, the more you can. Growth because of the ability of blood flow without restriction, or constriction. This is why pumpers have different cylinders bases on the phase of the pumping. Small first, then medium, then large.
Wonderful explanation!
Thanks!
 
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I'm not completely convinced. If the tube diameter is significantly larger than your girth, by not having the insert in, you are actually allowing MORE skin to be sucked into the tube. Also, once your girth is pressed against the insert, it would no longer be in contact with water and would not have the vacuum pressure exerting on it any further. The pressure would then be relatively higher on the exposed tissue which in its efforts to expand would draw blood away from base and subsequently replaced by blood inside body. And so I don't see how the insert would cause enough compression on base to have a restriction of blood flow.

I thought I read early on in these forums that you want a tube that is relatively close to your widest girth so you don't develop a deformed penis. I definitely don't want a cone penis. I'd rather have more like a baseball bat lol.
 
I'm not completely convinced. If the tube diameter is significantly larger than your girth, by not having the insert in, you are actually allowing MORE skin to be sucked into the tube. Also, once your girth is pressed against the insert, it would no longer be in contact with water and would not have the vacuum pressure exerting on it any further. The pressure would then be relatively higher on the exposed tissue which in its efforts to expand would draw blood away from base and subsequently replaced by blood inside body. And so I don't see how the insert would cause enough compression on base to have a restriction of blood flow.

I thought I read early on in these forums that you want a tube that is relatively close to your widest girth so you don't develop a deformed penis. I definitely don't want a cone penis. I'd rather have more like a baseball bat lol.
No worries. Doubts provide clarity in the pursuant of the knowledge. Let's break things down:

The insert reduces the total diameter for the BM. This is the "small" diameter you're looking for. Coming into the cylinder fresh, your skin is still nice and tight and not as loose. The expansion of your penile shaft is not as larger, where no restriction or constriction occurs at the moment. Using the comfort sleeve will reduce the chance for the skin at the base of the base from being sucked up into the wide diameter of the BM.

However, the moment after the first pumping session, within 5 minutes, your skin along the penile shaft and the base of the penis pulled to the point where you have 125% to 140% elasticity. Your nerves and blood vessels are less than 4mm below the skin. When your skin expands, your internal tissues also expand. This pushes the nerves and blood vessels closer to the outer skin, with a higher likely chance of being pressurized against. By using the BM's insert, now, you're compressing the nerve, the branches, and blood vessels between the internal tissues expansion and the outter skin. The best indicator for this is the numbing feeling on the second and third pump sets. Why that dull feeling of numbness? Because nerve and the branches are being compressed. Just imagine the blood vessels. With that in mind, let's go to the next point.

You indicated that the expanding girth presses against the insert and has no further expansion influence from the water/air under vacuum pressure. That is incorrect. The expansion for the surface area against the insert will stop, and the vacuum pressure continues to move forward towards the exposed area above the insert. You indicated that that well. However, the problem is the compression against the insert cuts off the nerve neuro-signals and the blood vessels. This is venous constriction at the highest. There is no more blood flowing into the penis at an optimal level. You can continue to force and force and force the blood in, but you're only introducing a small amount compared to a more loosely opening at the bottom. Whatever fluid is already in the penis, the vacuum pressure causes the balooning towards the overpressurized zone near the glans. The best comparison to this an innertube with a hole in the tire. Same amount of air volume, under pressurization of weight, the innertube stretches through the opening of the damaged tire until the possible innertube explosion. In our case, the penis suffers blisters, edemas, and blood spots/welps.

In the case of having a cone penis, where the bottom is larger than the top, the same can be said for a bat penis, where the base of the penis is small than the mid to upper part of the penis from over using the insert. This is why the cylinders come into play. Notice our brothers don't just have the BM, but also the MityVac cylinders as well. I have 2 cylinders and a BM. Funny isn't it? BM is awesome for compactness and on-the-go needs. BUT the cylinders are needed to keep everything, and I mean everything uniform. I have a 9in x 2in cylinder, a 11in x 2in cylinder, and another 11 x 2.25in cylinder on the way because I discovered my girth is expanding way too fast and it cuts off my blood after my 7th set of pumping. At this point, my fatigue kicks in, and I can't force any more blood in even at 70% erection.

PE is a crazy endeavor.
 
Before I got MityVac Hydro-Vac Penis Pump by MOS with 2.5" cylinder, I bought the Bathmate ®HydroExtreme 11, and I am honest now ---> This pump took my growth to the next level. HydroExtreme 7 Wide Boy or HydroExtreme 9 couldn't force girth expansion as HydroExtreme 11 did. I switched between these pumps in order to force girth expansion throughout and up my shaft.

Without this pumps extreme width (HydroExtreme 11), I had not been able to force girth expansion as I did. I'm thinking about combining this pump with my 2.5" cylinder (MityVac) and force my girth even more. There is a different kind of suction at the base with Bathmate. I can't explain it.

The HydroExtreme 11 is the widest Bathmate pump they sell, do bad they do not make it shorter.
All this is why I believe I have overdid this. I probably didn't need HydroExtreme 11, but I was inpatient and I believed in Bathmate back then. I'm mainly using MityVac Hydro-Vac Penis Pump now, but my bathroom is my laboratory so everything is allowed. This is what penis enlargement obsession imply. It's hard to stop.
 
Without this pumps extreme width (HydroExtreme 11), I had not been able to force girth expansion as I did. I'm thinking about combining this pump with my 2.5" cylinder (MityVac) and force my girth even more. There is a different kind of suction at the base with Bathmate. I can't explain it.
Have you noticed that the pumping actions actually release more water and inducing higher vacuum pressure for the Xtreme 11? One of the brothers I discussed with behind the scene is using it. He literally screams using the same amount of pumps compared to the Xtreme 9 and the new 11.

All this is why I believe I have overdid this. I probably didn't need HydroExtreme 11, but I was inpatient and I believed in Bathmate back then. I'm mainly using MityVac Hydro-Vac Penis Pump now, but my bathroom is my laboratory so everything is allowed. This is what penis enlargement obsession imply. It's hard to stop.
Like you, my entire side of the bed stand drawers are filled with PE equipment. 3 full drawers. It's crazy. My son is looking at me strangely every time he saw the night stand opened up. Don't come into my room unless you're ready for the penis torturing scene.
 
Have you noticed that the pumping actions actually release more water and inducing higher vacuum pressure for the Xtreme 11? One of the brothers I discussed with behind the scene is using it. He literally screams using the same amount of pumps compared to the Xtreme 9 and the new 11.
It's a feeling mostly. I saw more girth expansion at the width inside HydroExtreme 11, and was then able to expand more in HydroExtreme 7 Wide Boy, after combining 7 Wide Boy (Same width as 9) and 11.

I do not have a gauge on my Bathmate pumps so I really can't tell you what vaccum pressure I was at. Love the MityVac Hydro-Vac Penis for the live vaccum pressure control (both reducing and increasing). Bathmate pumps tug to much at my balls.

I feel kinda bad and insane that I didn't use it for a longer time, so I need to start using it again. Can't buy another cylinder for MityVac, then I feel I'm getting into the insane/obsession level. But the 2.25" cylinder for MityVac would be nice, to combine with the 2.5" cylinder. I confident that thst would make me grow faster and more even.
The 2" is to small now. But I feel I need to slow down now.
Need to prioritize other things in life soon.

Like you, my entire side of the bed stand drawers are filled with PE equipment. 3 full drawers. It's crazy. My son is looking at me strangely every time he saw the night stand opened up. Don't come into my room unless you're ready for the penis torturing scene.
Yeah! I haven't showed my collection to anyone, I hide it everytime I get visitors. But if I'm going to live with someone in the future I suppose they will find out about it

It's both hard and a a comfort that I can't stop.
 
In a relationship, I can tell you straight out. Don't be afraid to reveal your PE. This is coming from over a dozen couples I've talked to. My wife and I discussed with them during our date nights. The girls were gitty talking to my wife and the ones that have the golden ratio penises through PE for the past X to XX years. The one who just joined the PE journey is looking at them to experience what the girls enjoyed through the PE journeys. Freakish panthers and cougars.
 
In a relationship, I can tell you straight out. Don't be afraid to reveal your PE. This is coming from over a dozen couples I've talked to. My wife and I discussed with them during our date nights. The girls were gitty talking to my wife and the ones that have the golden ratio penises through PE for the past X to XX years. The one who just joined the PE journey is looking at them to experience what the girls enjoyed through the PE journeys. Freakish panthers and cougars.
Will not hide my true self.
But I feel like I need to take a break. To much thinking about my penis right now. I think I need to relax a bit, do other things and enjoy life. PE needs to become a part of my life now, not be the only thing I do besides work.
Need to get back to the gym and become stronger again.
I need to shift my focus a bit.
 
@oldandlively, What do you mean with this?
The sudden rush of more intense pressure and slightly larger diameter got his scrotum sucked up. He thought he could just go straight to his usual pressure about any problem. Well, that was the problem. What he thought at 8inHg in his Xtreme I was the same as 8inHg in the Xtreme 11. There's actually an offset of pressure by 2inHg. Probably due to the baffles gaiter materials a bit harder and causing more uniform pressure to build up faster, like a normal cylinder.
 
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