“igm – Member
Why do tubeless blow off at pressures that tubed take Ok?
Je ne comprend pas”
When you run tubeless, the bead of the tyre is seated right in the groove in the rim, so although the seating is sound the bead is only 2 or 3 mm from coming off. As pressure is increased, expanding the tyre, the seating is bound to get looser and there comes a point when it is too loose the keep the tyre on the rim.
When you run with a tube on a Stans rim, the bead of the tyre sits further within the rim under the tube and further away from coming off. Plus since the tube is a complete tube rather than a U shape, the pressure works in all directions – not just expanding the tyre but also crushing the beads more tightly onto the rim. So there is still a point at which a tubed tyre will blow off, but it’s a higher pressure than with tubeless.
Stans rims are designed to be run tubeless anyway, and if you do run them the way they’re designed there’s no need for high pressures.