Recently had a ~110 pound passenger on my bike for a couple of short trips to lunch and back. I'm relatively light so mostly I've kept my rear shock at the 3 or 4 position. But with the passenger... yikes... I'm thinking I need to bump it up to at least 5 the next time I plan to take her on the bike. Overall though she indicated sitting up while on the rear seat was not comfortable, but if I slide all the way to the rear of my seat and lean forward as much as possible it gets more comfortable for her. As for bike performance with the extra weight.. definitely a little slower but I was still able to get up to speed pretty darn quick on these SoCal freeways...no worries.