Just got a new RadRunner, the manual says check for correct pressure on tyres
Nothing there, no data at all!
I am a tyre pressure nut!
My best guess is 40 to 50 PSI
What say you?
Recommended is 20-30 PSI:
https://radpowerbikes.zendesk.com/hc/en-us/articles/360022541053-Tire-Performance-and-Replacement-Information
All tire manufacturers put the max PSI as part of the mold on every tire. It may be difficult to find. Use some sidewalk chalk. Rub it on all the bumps on the tire. The manufacturer name, model, and size should be there also.
I need my 3x magnifiers for such work. A handheld magnifying lens will do the same/better. I had Corvair's in HS & College, that's the one vehicle where manufacturers' suggested tire pressure is CRITICAL.
Good luck!