Hi Claire,
Congrats on your 4th women single speed, 9th OA women finish at Lumberjack 100. Awesome!!!
1. I recommend starting with our 12-week Category 1 Cross Country Mountain Bike Base Mountain Bike Training Plan and then progressing on to our 24-Hour Solo Mountain Bike Personal Record Mountain Bike Training Plan. Take an easy week before your bikepacking trip and a recovery week after.
2. Starting with the Base plan is still the best option given your #1 goal of PRing Polar Roll Ultra.
Coach Lynda
PS Sorry for the slow reply. I was having fun out of the office and off-line for a birthday trip 🙂