Frequent punctures, is my weight the problem? 2 road bike. The rear tire keeps popping. I have replaced the rear rim and tube. Every time I go for a ride I inflate the tire to around 70-80psi. I am on the heavy side (310 lbs). What are my options. A stronger tube if they make one. Or a different bicycle in which case what do you recommend?
Increased load (i.e rider weight) on a pneumatic tire does not increase the pressure in the tire. The contact patch on the ground just increases in size until the contact patch area x pressure = load (or the rim contacts the ground).
What might be happening is you are getting pinch flats when hitting bumps or holes. This is when the tire and tube are deformed so much by the impact that the tube gets pinched between the tire and the rim often resulting in two symmetrical holes in the tube.
You can try running higher pressure which will stop the tire from deforming as much. 70-80 psi is on the low side for a road bike 28-23mm wide tires.
If you have clearance in your fork or frame run a wider tire. Also if your wheels will support it consider running tubeless tires, which are of course not susceptible to pinch flats.
Trying to avoid bumps and holes in the road, and standing up slightly to absorb impact through bent arms and knees can also help avoid pinch flats.