There’s at least 8 of them, too!
And they really all come from your body, not the equipment.
I was wondering if running or swimming had their own internal gears: not really. Or even downhill or telemark skiing.
I’m talking about techniques that you do significantly differently as gradients change, just like the gears of a bike or car. Or, heck, even as conditions change. (Alpine skiers adjust force aspects as they shift from powder to crud but not much more than that. They do have the tuck, etc.)
Like, going from slow to fast, from steep to downhills, Classic XC has these gears:
*Herringbone
*Flying Herringbone
*Tour Striding
*Race Striding
*Stride Doublepoling
*Kick Doublepoling
*Doublepoling
*Tuck
Then there are a few different kinds of Classic cornering: Step Turn, Skate Turn, Stride Turn.
And Ski Skating has these gears, from steep-up to downhill and from slow to fast:
*Diagonal Skating
*V1 / Offset / Paddle-dance
*V2, One Skate
*Marathon Skate (fits sometimes, works in and out of tracks)
*V2A, Open Field, Two Skate
*No-poles Skate
(Skating really has all lame terms.)