how do you know if you need long or medium? and whats the difference? other than the obvious!! length.
my rear mech is goosed and i am not sure which i need for my orange 5?
any help appreciated.

If you've got a triple ring front set up with a normal (not road) 11-32 or similar rear cassette, you need a long cage.

If you've got a triple ring front set up with a normal (not road) 11-32 or similar rear cassette, you need a long cage.

Perfect text book answer…however if you're disciplined with your gears and avoid the extreme combinations of gear (small chainring/small sprocket or large chainring/large sprocket), as you should anyway, a medium is sufficient and you gain a bit of chain tension and the mech is a little less vulnerable.

Alaric.