I'd guess it's because unicycles are used in a much narrower range of circumstances. Few people are being hit by cars commuting to work on a unicycle, nor are there many mountain-unicyclists getting injured.
You joke (I think?), but the people I know that do unicycling (including mountain-bike style unicycling, and unicycling Himalayan trails, and crazy stuff like that) do do an insane amount of training 😆
You’d have to. Anyone who mountain bikes regularly knows how much work it is to climb some trails with 500% gear range. I can’t imagine the work involved with a single gear to climb on some trails. Brutal.
This is probably another reason why unicycles are less dangerous. People I know that do mountain biking end up in hospital from time to time from coming off at speed, speed on most unicycles is probably a lot lower. Though I thought geared unicycles existed?
There are basically no unsafe ways to get off of a unicycle. You can fall in any direction and just end up standing next to your unicycle. Compare that to a bicycle "over the handle bars"-accident.
