Lovely pics. It's a long time since I toured the Western Isles, but I expect that very little changes there.
Unfortunately my OH never learned to ride a bike so it's the bus, driving or "Shanks' pony" for us. I cycle occasionally on an old Raleigh with 5 speeds. More than enough for someone who grew up with a 3 speed Sturmey-Archer.
The islands are lovely by (free) bus as well. I want to get back to Barra to cycle.
I grew up with a manual bike - no gears and you pedaled backward for the brake.