Clearance will be the huge issue for a propel, I'm not even aware you can get 28mm slicks on most of them due to the rear cutout?
You could investigate dropping wheels down to 650B and you'd have more bigger volume tyre options? 650B some CX tyres comes in at around 700C 28mm width (or so I've heard/read).
You could investigate dropping wheels down to 650B and you'd have more bigger volume tyre options? 650B some CX tyres comes in at around 700C 28mm width (or so I've heard/read).