Originally Posted by
chasm54
You might try the Marathon Racer? I haven't, yet, but schwalbe claim it is the lightest and fastest tyre in the marathon range. And generally speaking, I have found that schwalbe's stuff does what it says on the tin...
I own these and what's been said seems to be true. I still need to put more mileage on them to find its weaknesses. I have the 26 x 1.75" and are light and supple. These also come in 700 x 38c which meet the OP's requrements. Given its width, these tires do feel and grippy even on dirt/gravel. I also like the reflective strip on the side for safety at night. I paired them with Schwalbe tubes which also come highly recommended.