Weird thing about Strida is that when you change the wheel set it becomes a different model.
I bought a 2nd hand SX and downgraded the wheels to 16" spoked wheels and now the SX became a 5.2 model.
I would suggest a different model identification similar to that of the Brompton to immediately know the specs of the bike
Handle Bar Type
S = Straight
B = Bended
M = Moustache
Drive Train
1 = Single Speed
2 = SD
3 = EVO
Wheel Size
14S = 14" Spoked
16P = 16" Plastic
16S = 16" Spoked
18 = 18"
Handlebar Type + Drive Train + Wheel Size
So when asked what’s your strida model I’d say
S1-14S = Mini
S1-16S = 5.2
S1-16P = LT
S1-18 = SX
S2-16S = SD with 16" spoked wheels
S2-16P = SD with 16" plastic wheels
S2-18 = SD with 18" wheels
S3-16S = EVO with 16" spoked wheels
S3-16P = EVO with 16" plastic wheels
S3-18 = EVO with 18" wheels