Narrow tyres tubeless is a no-go as the high-psi required to get the tyre seated and shaped can cause blowouts, especially if you get impact such as a pothole.

Narrow tyres tubeless is a no-go as the high-psi required to get the tyre seated and shaped can cause blowouts, especially if you get impact such as a pothole. Going for wider tyres means you naturally can go lower PSI, but if you drop PSI with tubes you risk pinch-flats ('snakebites'), where striking a hard edge causes both edges of the tyre to puncture (like X___X on the cross section, rather than \__x_/ of a normal puncture). If you go wide, you can then drop the pressure more as you don't have a tube to pinch. This gives you the great comfort, the pliability to absorb road imperfection (which improves speed), and less likelihood of puncture. As an approximate pressure guide: # weight in kg. front load probably 0.45 (45%). tyre width in mm weight_front = weight * front_wheel_load weight_rear = weight * (1 - front_wheel_load) psi_front = (338.14 * weight_front / tyre_width ** 1.5785) - 7.1685 psi_rear = (338.14 * weight_rear / tyre_width ** 1.5785) - 7.1685 This should ballpark you 15% tyre deflection under load, which was a guide from an old bike magazine on a balance of rolling resistance and comfort.