Just a quick note. Loving the 700x33 Soma Supple Vitesse SL on my 82 Trek 613. Paired with latex tubes it's a heavenly combination: forgiving and fast. Pumping up before a ride hasn't been a hassle. So if you get stuck with 42s max, don't discount the more supple varieties. Time will tell on durability, flats, etc.

Of course I'm comparing to my 700x25 Conti 4seasons on an aluminum/CF bike I sold last summer. Felt every seam in the concrete on that one. But it has me pondering whether I'll like my LeMond's 650x38s as much as I put it back together, after riding that wonderful combination.