I recently bought a Giant Defy 2.5 which came with a triple chainset. As it looked hideous, weighed a lot and had a ring I don't need, I swapped it for a Tiagra compact double.
I didn't think this would be a problem as the shifter (also Tiagra) had a sticker on it saying it was suitable for either double or triple. However, I'm really struggling to get the front mech set up for the new cranks. Is this because I'm being a bit crap or do I need to change it to a double-ring specific mech (it's marked as Tiagra triple)?