This snug but comfortable helmet has a secret power. It reads minds.
Its array of neurotransmitters sends signals to a smart phone attached to the bicycle's handlebars, which then connects to the gear system. With a little training, a cyclist can change gears with a thought. One kind of brain wave commands the bike to downshift; another causes it to shift up.
D- not sure how I feel about a wireless link. It can be jammed or hacked.
But some sort of gloved-hand induction scheme could be robust.