Looks like the line sizes are:
1.75mm Spectra for my rudder lines on my Adventure.
2.2mm Spectra for my rudder lines on my TI.
After inspecting my rudder lines this weekend, I didn't find any signs of damage. Even were there were knots to accommodate the new rudder. Will keep a small spool of the stuff in my ditch bag just in case.
Wow, no wear at all? After 3 months use mine looked like they were attacked by an anger spouse with 12 grit sand paper. That, combined with all the knots, pushed me to fully replace the rudder lines. I made a very significant safety improvement when I did it. Hobie has three individual sections of rudder line and if one loop falls off a tiller post, the whole system fails. This happened to me and natural not on a nice day. The loops in my rudder lines for the tiller posts are looped though each other and crimped in place. So it is one complete line rather than three separate pieces. see pic...
I also added a closed eyelet, the OEM hook rotated on me once, the rudder lines fell off, and I lost steering.