Tandem geek:

I am actually running 23 mm conti 4 season now and will move those to one of my 1/2 bikes. Going with the 25 mm conti 4 season. Not sure the 28 mm tire will work with the cantelevier brakes. Just want a tough tire and don't want flats - that is why the slime tube and kevlar tire protector strip.

Would love to loose the extra weight. I can change flats easily, so maybe just use a regular tube and no protecotor strip.