Shimano BB-MT800/SM-BBR60 Adaptor

thingiverse

This is an adapter to allow you to use a standard Hollowtech II bottom bracket tool with some of Shimano's newer bb's that have a smaller diameter than traditional external bb cups. Specifically, this adapter is designed to work with the BB-MT800 (tested) and SM-BBR60 bb's from Shimano. The adapter is equivalent to Shimano's own TL-FC25 tool, designed to be a tight fit on the bb. I recommend you use a fully encircled tool such as the Park Tool BBT-9 when using this adapter instead of one of the half moon style ones to prevent the adapter deforming or stripping. I have tested this with a Lezyne EXBBT-CLT tool pictured on a BB-MT800 bottom bracket and it works perfectly.