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Challenge is pumping its Dune cyclocross tread up to 40mm and offering it as a tubular gravel tire. New Challenge Tubeless-Ready and Tubular Gravel Tires. 2018 Sea Otter Classic. © Cyclocross Magazine

Challenge is pumping its Dune cyclocross tread up to 40mm and offering it as a tubular gravel tire. New Challenge Tubeless-Ready and Tubular Gravel Tires. 2018 Sea Otter Classic. © Cyclocross Magazine