Originally Posted by
meanwhile
It's not really tyre weight that sets speed and acceleration but
rolling resistance, which comes from tyre wall thickness and the compound used. (Look how little difference a huge amount of weight on the rim makes even on a climb:
http://www.training4cyclists.com/how...on-alpe-dhuez/)
The Marathon Racer is probably as fast as any 35 out there - probably as fast as many 25mm clinchers. The Marathon Supreme costs more and isn't quite as fast but has superb puncture protection and will last longer. Conti Sports Contacts are fast, but I didn't like the lack of wet weather grip that mine have. (Since then I've heard other people rate them highly: Conti may have added more silica to the compound.)
You could also reduce rolling resistance by fitting latex inner tubes - you can find 35s if you look hard enough, people use them for cross racing.
I used Marathon Racers a couple years ago. They were slower than the Paselas I had been using, and the ride wasn't as nice.
Not that they were bad tires, but I am not entirely sure who they are for.
Somebody mentioned Grand Bois Cypres tires. My wife (110 pounds soaking wet) uses those. They are VERY thin
and if you aren't quite light you will have quite a few flats. They have a really sweet ride. Here's an American source for them..
http://www.compasscycle.com/Tires.html