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The clearance at the chain stays with these on is safe but I think any wider might make me a little uncomfortable. A true 28 mm almost certainly would rub, so this is a blessing in disguise in a way. I was half expecting them to come up narrow because when I was searching for information on wider 650C tires, I remember reading on a recumbent forum that the 28 mm Terry Tellus (which is also made by Panaracer) is not actually 28 mm.
Do you know if the folding Schwalbe One or Vittoria Rubino come out any wider than the listed 23 mm?
23 or 26 is a big difference no? Do they fit the frame? Clearance on my 650 frames is already tight with modern 23 tires.