serious, I'm 6' with a 34" (86cm google tells me) turf to taint inseam and size 13 nike (48 sidi) shoes. I recently swapped my 54cm road frame for a 56 and toe overlap is nearly non existent, and I like my cleats back on my shoes.

I wouldn't even consider a 53, and I'd have to test out the 55 before I bought it. Without throwing a leg over a bike, I avoid buying anything smaller than a 56.

So, OP, don't get the 53.