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@Greenbank
I use 67" (46x18 on 700c x 25mm tyres) for fixed Audaxing including real hills. That was good enough for the Elenith (4720m climbing in 300km), the Bryan Chapman 600 (8300m climbing in 600km) and LEL (no AAA points but it did include Yad Moss and the Moorfoot Hills on the B709).
Elenith route: http://www.bikely.com/maps/bike-path/Elenith-Audax-300km
BCM600 route: http://www.bikely.com/maps/bike-path/Audax-Bryan-Chapman-2004-route