650x32B touring tyres
Tbessie, via the CyclingUK forum
650×32B is an interesting tyre size; roughly the same as the old British 26×1 ¼" touring standard, the tyre is narrow enough to be lightweight while offering a fast, comfortable ride. The rubber available in this format tends to be high operformance. For example, the Grand Bois Cyprès weighs just 260g. Hutchinson’s Confrérie des 650 (available online) is a little heavier and impressively tough. Another 100g heavier, the Continental Contact Speed should make a durable touring tyre, but none of these is comparable to, say, Schwalbe’s Marathon range. The good news for anyone with 26" wheels is that this size is going to be around for a long time yet.
Technical Editor, Cycle magazine