Armwind doesn't seem to exist, no dictionary entries there.
Heardwind wasn't exactly what I was looking for, but fits the use case quite well.
Headwind/tailwind never occured to me (complete new words there), don't sound very intuitive to me somehow. (In German it's literally "toward-wind and "back wind".) Crosswind is definitely a nice word, too.
Anyhow, got another one:
Say you have a pretty old bicycle. It's squeeching and perhaps rusty and you just get the impression it might just fall into pieces soon enough.
What's the best word to describe that? There is a German words called "klapprig", it yields:
rickety
ramshackle
decrepit
rattletrap
frail
clapped-out
tottery
Which aren't words I think I have seen being used for gadgets falling apart soon. (decrepit, ramshackel and rattletrap for old buildings perhaps and frail is more like for old and weak bodies or badly designed constructions.)
On the top of my mind I also thought of ratty. Anything else there? There is of course also worn, but that doesn't have this implied connotation of it about to fall apart.
(clunky perhaps? Although that would stress more the part of the bycicle being not all too confortable to ride on.)