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@randombadger69
Were only talking 8mm difference in bead-seat diameters. Which with the right "drop" brakes shouldn't be a problem. You need a weinmann 630 is it?
Anyhoo stick a 622mm rim in and measure from your brake hole to the rim and get hunting for brakes with that drop.
The old boys used to ride 27's, carry their 700c sprints out to time trials, then swap over and race.