Hi,

Tyre sizing is a nightmare! This webiste is very helpful...

http://sheldonbrown.com/tire-sizing.html

The only tyres on wiggle of that size are below...

Neil

It might be. It really depends on the type of frame you have. 700x28 are too wide for many road (race) bikes. They should fit on hybrids and cyclocross bikes with no problems.

Yes, 622 is the size you want for a 700C wheel.

This would depend on the bike and your wheels. I would recommend contacting Specialized for their recommended tyre widths.

These tyres do not have reflective sidewalls.

The guarantee is on the tyre, you are not required to use the supplied tube.

20" = 406.

You can find more information on ETRTO here:

http://tinyurl.com/schwalbe-ETRTO

Not this one, you need the 26x1.6 available under "MTB-Road". This will be narrower than your current tyre but not too much. Make sure you get good pressure in it though!
It'll be a bit slick for wet days and don't expect that groove to shift much water even on a damp day.
Moving from knobblies to road-like tyres (very sensible) for road use you'll be best off with a decent tread. It will roll better than a pure MTB tyre and grip better too, not as good as a slick in the dry but when was the last day you were guaranteed a dry journey.
A good tyre but check out treaded ones first IMHO.

Neither is strictly the answer. Your "imperial" sized tyre sits between the two, but is closer to the narrower 32mm tyre.

You could run 28 or 32's without any problems on a 19mm wide rim.