J'ai mal - I hurt - point to injured spot
Possibly the single most useful phrase you'll need!
Since I speak pretty good French, I was susrprised at how many riders had not taken learning a few phrases into account during their preparation.
I ordered cakes, donuts, croissants, coffees etc. for a large group of american Randonneurs in a cafe in the middle of nowhere. They had no clue what the proprietor of the cafe was asking them and were simply repeating politely, but loudly, what they wanted. Many smiles and jokes all round once I did my translation bit.