Hi - I'm planning on doing a fair old tour over Europe on my 60s Mercian King of Mercia. Shamefully, however, I'm not particularly clued up on gears.
The image below is my current double - which is great sans "load", but I'd rather go lower for my trip. Ideally, I'd keep the smaller ring size as my largest, and have a smaller (granny?) ring as my smallest.
I don't exactly know how I'd do this... I assume it's not possible for me to simply add a smaller ring, so would I have to get a full new crank and ring set? If so, could I just pick any up?