leaky centerline
First, make sure the wheel is not bent. Scrape the old silicone/caulk depending how old the rim is and use 100% silicone. Silicone never dries out. Then lay something across the wheel & run it around the whole thing to smooth up any excess silicone. Try & make it as even as possible. Hope this helps. Kris p.s. be careful as you pull out the old sealer there should be an o-ring in there.