Originally Posted by
guadzilla
Question about tubeless tire pressure for all the experienced users here:
At 176lb (presently 180lb, but i'll be bacl to 176 by the end of the month. Really) I generally run my clinchers at 110r/100f for 23s, 100r/90f for 25s and 90/80 for 28s. With tubeless, I am guessing at lower pressure, the sealant is more likely to seal instead of doing bukake all over my bike and me. Is there a general rule of thumb on how much lower i can go with tubeless, so that odds of sealing improve and yet rolling resistance doesnt get too high?
I weigh the same as you do. The roads where I live are pretty good, so I use similar pressures as you do. The reason I no longer run tubeless on my road bikes is because I found it didn't work very well at those pressures. Most of the time the sealant did it's job and plugged a hole, but it was very common for the hole to re-open when the tire was re-inflated to its nominal pressure. In other words, once a tire had a puncture, it then had to be run 20-30 psi less to avoid a "relapse." For a lighter rider, or someone who prefers lower pressure due to rougher roads, tubeless can work well. For me, on the roads I ride, I wouldn't run tubeless on my road bikes again, unless I went to 28mm tires and stayed at least 10 psi below your nominal 90/80 psi.