The trail down into Poker Flat was the worst part. I came in from the La Porte side which was home to the bowling ball sized loose rocks in the trail. The Downieville side was much easier and doable for the bigger bikes. Be prepared to do some carrying on the La Porte side and dont make the same mistake I did and try it alone. I got the workout of a lifetime packing the GS over the rocks by hand!
Honestly the trail is steeper than the photos make it look.