When ever I have rode, I always have the same stirrup leathers so I don't have to change them.
But how do you actually measure your stirups?
Is it what feels comfy?
Or is it how much your leg is bent?
I go by what feels comfortable once I'm up there. Some people will use their arm to measure. You hold your arm out straight and put your fingertips at the buckle. The bottom of the iron should be at your arm pit. This measurement doesn't usually work for me, but I suspect that has something to do with my abnormally long legs.
I don't get the arm thing lol. But I just go for whats comfy.
My friends have them really short like there leg is bent to 90 degrees :/ so that made me think if I've got them wrong :/
But I think they have them that short because they think its cool?!
I always adjusted them so the iron hit my ankle bone :)
Of course, that changes depending on who I ride. If I'm on a really big horse, then a lot of times I'll drop them one hole. On ponies, I sometimes raise them a hole [i'm 5'8" so I gotta raise it to keep my leg on!] I ride with relatively short stirrups to begin with though, so I don't like to raise them at all.
Depends on what discipline you are riding:
1.) Jumping is shorter stirrups - higher jumps are shorter stirrup leathers
2.) Flat work is longer stirrups
3.) Dressage/Western is typically longest length leathers.
I was always taught:
For jumping: measure iron to your ankle bone or just above (above works better for me)
Flatwork: lower jumping stirrups 1 to 2 holes
Dressage: iron should come to just above the heel
The arm technique unfortunately will rarely give you a perfect length stirrup. It depends on your body shape, some people are lucky and their arms will perfectly match their legs, but this is not the case for most people. Hell, if Manolo Mendez (google him) worked his stirrups by running them down his arms, I don't think he'd even be able to reach the stirrups haha, his arms are THAT long! Others have very short arms, and the stirrups will be far too short. You can use it for a VERY approximate measure, but as I said, unless you're the minority, you won't wind up with correct length stirrups