Quote: I know that my ex hangs out on a biker bb and yesterday I had the idea that I could start posting there and talking about bikes.
Is that you? A person that wants to post on the biker bb? If it is solely for the benefit of X then I would not do it. When you are together with someone it's okay to express interest in things they enjoy, but in your current circumstance it will not appear genuine and would definitely be construed as pursuit.
T, you have been way to focused on your X lately. He has a lot to work through and I'd give him the time and space to do so.
It's nice of you to be there for him while his brother is sick. Just leave it be for now and at some point he'll recognize that you were support to him during this time. If you push it he'll only remember that you wouldn't give him the space.
In the end, it's not the years in your life that count. It's the life in your years. Abraham Lincoln
It is hard to fail, but it is worse never to have tried to succeed. Theodore Roosevelt