Sadiq Khan, the current Mayor of London, was spotted riding a (strikingly regular) bike around in May 2020.
What is the contraption attached to the center of his handlebars?
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1 Answer
Looks to me like Shimano CI Deck gear indicators. They connect to the shifters with a little cable that pulls a dial to tell the rider what gear they're using.
https://si.shimano.com/pdfs/si/SI-6XJ0A-000-ENG.pdf
From the user's view:
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These are similar in concept to the Visual Gear Display/Indicator (VGD / VGI) on many MTB pod shifters. I have a similar display on my alfine11 hub because otherwise there's no way to know what gear it is in. DI2-equipped bikes can have a wireless display module peered with the system too. Tandem riders can appreciate how hard it is to see your own cassette and chainrings when they're several metres behind you!– Criggie ♦Commented Jul 29, 2020 at 2:40