I'm a clueless beginner who is trying to buy a cheap and simple single speed bike for my short urban daily commute. I found one that fits my needs and budget, but I'm not sure which frame size I should go for.
I'm 180cm/5'11 inch tall and my inside leg measures around 85-86cm, so the ideal single speed/fixie bike frame size (based on some chart I found) is 56cm.
Sadly, this bike isn't available in that size. 54 and 58cm are my only options. Which one should I go for? Slightly bigger or slightly smaller?