I didn't realize that Trek actually made a 64cm bike. That is HUGE.
According to the page you linked:
62cm for 6'2 to 6'5
64cm for 6'4 to 6'7
So, your friend would just barely be at the top end for the 64cm.
Originally Posted by
Darth Lefty
For a basic 520 steel bike, 64 or 66 cm that KHS looks nice. 36 spoke wheels
Add Parlee to your list of custom Carbon frame builders.
Lots of custom builders working in steel. Plus quite a few used steel bikes that are very TALL.
A few custom builders working with Titanium too.
Anyway, if the OP's friend likes the Émonda, then get the largest size available, and it should be good enough.
The seat tube on the 64 has a bit less slope (along with steeper head tube). So, with the seat all the way forward, that could be an issue. Unless it is in the wrong place.
Or consider full custom for a 2nd to 3rd bike.