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@hippy
http://www.chainreactioncycles.com/shimano-bb-adaptor-installation-tool-tl-fc24/rp-prod137442
"There are 2 new smaller sizes, the Ultegra/XT version is approximately 41mm in diameter and requires the Shimano TL-FC24 adapter to be used with the original HollowTech II tool. There is also the Dura Ace/XTR version which is approximately 39mm in diameter, these require the Shimano TL-FC25 adapter. "