I have had mine over 120 on the stock suspension but it was on a pristine bit of new road. Although overall my suspension really isn't bad and I am around 220 in full gear. Even at 120 the only issue was the wind. as it was pretty gusty that day. Give me a calm day I would take it to 130 easily without worry (on that same road). Give me a reflash, some wind protection and some better suspension and I don't think 150 would be a big deal on this bike at all.