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I believe that leash is the best and most consistent. Based on something I may or may not have read or heard from someone else at some point. May have been someone down the pub.
Nah, so long as you remember to untether when dismounting, I believe they are consistent and cheaper. Maybe electronic is better for fast/race situations but I don’t want to pay a monthly subscription for a CO2 canister.
Because race bikes don't have them. Therefore uncool, for grandads on BMs