John,
Why is the inflation pressure so important to you? Let me explain:
The force acting on the tyre walls (the force that supports your bike and body weight on the ground) is pressure times the internal area of the tyre. The wider a tyre the greater the internal tyre area (and it is a square relationship). For this reason, the same supporting force in a wide tyre is achieved by inflating it to low pressure while skinny tyres are inflated to high pressure.
For instance, a 2.6" MTB tyre can be inflated to 38 psi but a 23 mm road bike tyre would be inflated to as much as 160 psi to the same effect!
For this reason, nobody selects tyres by inflation pressure (and that's why Schwalbe doesn't publish these figures). The tyre selection is made by these criteria:
- How big my wheel is? (it could be 20, 26, 27.5, or 28/29" for instance)
- How wide my rim is? (it could be 17 mm for carbon fibre road bike or 40 mm for 3" tyres)
- How wide tyre would fit my bike? (the tyre width is limited by the wheel size, fender clearance, fork/rear triangle clearance, etc)
- The intended purpose of riding (paved road, gravel, off-road/dirt, all-rounder).
Therefore, you won't get anywhere by just looking for "60 psi tyres good for gravel and asphalt". The OPs choices are limited because
@pmcdonald rides a Giant Explore E+ in which the tyre size will be limited by the wheel size and frame/fender clearances.
Additional information:
There is some confusion about 28" vs 29" wheels. Both have the same rim diameter, which is 622 mm. 28" wheels are for "normal" (narrower) tyres while 29" wheels are for "plus" (wider) tyres. I can bet the wheels in Explore E+ are 28" ones as these are much standard for that bike type. Therefore, some tyre models are excluded from the OP's choice.