To stop me from constantly bumping my sales thread, if you're after 400mm a-c then some cyclocross forks are around that length.
http://www.wiggle.co.uk/surly-cross-check-cyclocross-forks/?lang=en&curr=GBP&dest=1&utm_source=pla&utm_medium=base&utm_campaign=uk&kpid=5360343993
@BareNecessities started
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To stop me from constantly bumping my sales thread, if you're after 400mm a-c then some cyclocross forks are around that length.
http://www.wiggle.co.uk/surly-cross-check-cyclocross-forks/?lang=en&curr=GBP&dest=1&utm_source=pla&utm_medium=base&utm_campaign=uk&kpid=5360343993