[CR]Simple one: why do sew-ups lose air more quickly?

(Example: Production Builders:Peugeot)

Date: Tue, 14 Nov 2006 19:48:56 +0000
From: "Simon PJ" <simonpj@mac.com>
To: <Classicrendezvous@bikelist.org>
Subject: [CR]Simple one: why do sew-ups lose air more quickly?

What is it about sew-up tubes that means that they 'leak' in a different way to the tubes in clinchers?

Thanks,

Wyndham Pulman-Jones,
Girton, Cambs.,
UK.