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Your wireless drivetrain might not be as safe or secure as you think - Canadian Cycling Magazine
(cyclingmagazine.ca)
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I believe some electronic gears are also really good at changing gear under pressure, which can be fantastic in a situation like that even if you doesn't automatically downshift for you.
What does "under pressure" mean? Does it mean shifting while stopped? I'm told some non-electronic belt drives can do that.
Just the opposite! It means while pedalling hard. Normally, to change gears, you need to ease off the pressure, similar to how you put down the clutch to change gears in a car. This can be awkward when trying to get moving from too hard a gear, or if you forgot to change gears before arriving at a hill.