Join Date: Jan 2005
Location: Portland, Oregon and SE Asia
Bikes: Waterford ST-22, Jamis Quest Elite, Jamis Dragon Pro
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It was probably me who mentioned the Conti T&C's - yes, they are a bit heavy as they are designed to take a lot of urban abuse (curbs, potholes, etc) and offer decent dirt traction also. They roll better than knobbies, but for keeping up with roadbikes I would probably look for a 26 x 1.5 slick or semi-slick that will offer even less rolling resistance than the T&C.
For touring, something like the Continental Travel Contact or Sport Contact are highly rated and offer low rolling resistance for decent speed. Schwalbe also makes excellent tires for touring. Then there is the venerable Ritchey Tom Slick and others of that ilk with emphasis on speed, but more for local riding and possibly not as durable or flat resistant as a touring tire.
The key to low rolling resistance on pavement is to use a tire that is smooth and offers continuous rubber on the center part of the tire with no knobs or even inverted tread on the center strip. You can have some minimal tread to the sides, but you want it smooth where it contacts the pavement. And higher pressure will also help, somewhere around 75-85 psi will have very little flex and roll well. Hence a slick at 80 psi is very fast. Look for kevlar belt to minimize flats.