What is the hdf5 project its the union of all hutchinson group intelligences regarding research development and experience in the composition of the best cycling compounds it is 105 combinations of compound mixtures 80 000 miles on test benches 21 000 miles on the bike all for the ultimate goal offer to every cyclist the hutchinson road tyre which they deserve the hdf5 consists of three types 51 52 and 53 hdf51 compound its the most accomplished compound composition made f