Guys...new here and thinking about getting into pumping. But I have run into a question I need answered before I can move on. Right now i'm 6.5x5.5. I have started the beginners PE routine and am moving along quite smoothly. My main question is this....What size cylinder should I buy. I looked at a website that had a size chart and it stated that with a girth of 5.5 I should get a 1.75" diameter cylinder. So I pulled out a 1.75 diameter ring I have and it fits relatively snuggly over my erect penis. So I guess what I am asking is should i move up to a 2" to allow for more expansion within the tube during pumping, bc it seems like I might fill a 1.75" rather quickly. Thanks in advance for your help.