I had my first significant puncture of the year on my rear tire. I’m running 28mm tubeless GP5000 with Orange Seal. The puncture sealed up and when I felt the tire, it was soft but seemed to hold my weight without deforming too much. That said, when I continued on the ride I was surprised at how I couldn’t hold speed on a familiar descent and powering up rollers felt more difficult than usual; for example I usually go about 40 MPH on the descent with minimal power, this time I was pedaling relatively hard but couldn’t get over 34 MPH.
When I got back to the car I check the tire pressure and was very surprised to see it was around 35 PSI . I’m 99 KG and normally pump up the tire to 90 PSI. Yes, in retrospect it was very stupid for me to bomb a descent on a soft tire but at the time, it didn’t feel super soft at the time.
The rim seems undamaged, thankfully, but I’m curious as to what the “cons” are for running a tire that is too soft. I know the benefits are a smoother ride on rougher roads and better handling in the rain, but do softer tires have more rolling resistance or is that just in my head?
EDIT: I’m not planning on running my pressure that low on purpose, but if there’s no effect on rolling resistance then maybe I’ll reduce the pressure to 60 PSI.