I have had 2 people on my bike in my life. one was a friend of mine and she was around 130 lbs...WOW that made it extremely difficult to ride...she had been on bikes before but only harleys, aka she had no clue how much she changed the geometry of my GSX-R 600 lol. second time was my friends girlfriend...she wasn't more than 90 lbs and was actually worse than the heavier girl because she didn't know where i needed her. after that i vowed to keep girls off the back of my bike. i have so far and its been like 3 years. just gonna have to get like a GS750G/L or something to cruise around on. sportbikes really weren't built to ride 2 up constantly.