Steve ...
There was one overwhelming problem with the Bontragers: the tyres simply would not separate from the rims. I had a puncture one day that required a tyre change. Nothing that I had with me could fit between the rim and the tyre to begin the fight to get the brute off. Taxi time.
Back home, I brought out my medieval torturer-certified instruments of persuasion. These included an enormous tyre plier gadget from Park Tools, two screwdriver-sized rubber-tipped levers from IceToolz and generous quantities of Schwalbe's Easy Fit (Ha!) mounting fluid.
I have no idea whether the tyres or the rims were to blame (both?), but I determined to swap over to 57 mm Schwalbe Marathon Plus MTBs. They refused to go on properly and I was left riding an ebike with a pair of bumpy and lumpy tyres. One Marathon punctured itself - a DIY insider job involving a wire bead that had been split whilst being encouraged it to go on. The other tyre exploded at the Trek dealer whilst being coaxed into place with a bit more air pressure than is usually considered appropriate.
The supplied Bontragers are hanging up somewhere in the workshop... unloved and lonely.
... David[/QUOToh boy....it sounds like it is pointless for my wife to be carrrying a spare tube on her Powerfly.