I have an update on the Specialized Alibi. When I picked up this bike it still had one airless tire in the front. That's now history. Installed a pair of Specialized Pathfinder Sports and new tubes. The OEM rim in front was ready for a tube air stem. Just had to remove a sticker. Schrader valve size. Good that matches the non OEM Alex rim in back. Now for the not great news. The front rim's inside width dimension is 21mm. That's good.
The back Alex rim is only 18mm wide inside. Sure wish it was a bit wider. I installed 700x42 tires. If you multiple 18 times 2.5 you get 45. Sheldon Brown's chart says I went to big but they do say that the chart is a bit conservative. Fingers crossed
I'm currently running 40psi. I might try 45psi and see if I can notice a difference.