Review on 🚲 Continental MTB Bicycle Tubes - 26, 27.5, 28, 29 (1.75-2.25) with Presta Valve 42mm - Value Bundle of 5 Bike Tubes by Young Toulson

on the rear of my Diamondback Foil 29er with Weinmann SL7 rims, Continental (Trail King 2.2) tires, Velox rim tape and Mr. Tuffy. I keep it around 35-40psi and they seem to be bursting at the seams. I tried higher pressure, which seemed to be an even bigger problem. I ride the relatively flat trails of Southern California; a mixture of gravel, usually dry mud, and sand. I have the same tube up front which doesn't break that often (although I did have a few spike punctures) so the issue must be related to the change in pressure my 230kg body is putting on the rear wheel. I'm looking for something thicker.