Bike Mielec

yes, it's super-short with the ~54 tt cc vs. 61 st cc ratio, but that's exactly what I would like to try out.
the tightness at the rear is only valid with the wheel in the innermost position, it would be more relaxed in reality, when the chain is a bit longer.

do you think the tt might actually be TOO short? I am 6'2", but not the youngest around, i.e. I like it a bit more upright, that's why it's so compact.

Maybe try setting a similiar position on one of the bikes you have and try out? Any partical fork in mind? Rake, travel? Tire size?