When I was last looking, the only decent 27" tyres (of any description) were Schwalbe Marathon and Panaracer Pasela: if they don't do them, you might be out of luck.
@Scilly.Suffolk started
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When I was last looking, the only decent 27" tyres (of any description) were Schwalbe Marathon and Panaracer Pasela: if they don't do them, you might be out of luck.