I think 700c (622mm) tubes usually stretch to 27" (630mm). I've found Schwalbe tubes hold their air pretty well, SV17 are the ones.
Edit: Oop, 50p cheaper at SJS
@ffm started
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I think 700c (622mm) tubes usually stretch to 27" (630mm). I've found Schwalbe tubes hold their air pretty well, SV17 are the ones.
Edit: Oop, 50p cheaper at SJS