hot itallian whether you have ultegra 6800 or durace 6900 with hollow tech you just get an Shimano italian BB at $25 to 30 and put your parts on
https://www.racycles.com/bikes/road/...-frameset-1212
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Life is too short not to ride the best bike you have, as much as you can
(looking for Torpado Super light frame/fork or for Raleigh International frame fork 58cm)