For TT’ers the fabulous Modolo Kronos Caliper we’re great with the main flaw of wouldn’t stop you in the wet & pretty poor in the dry but then TT’s were not about braking
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https://www.iancammish.co.uk/modolo-kronos-cxde
Love a Jubilee, especially a drillium one (which is slightly heavier!). But a Walter edges it for the weight weenie title -Huret Jubilee. Probably the lightest and weirdest derailleur ever envisaged.