LOL i like eugene's idea of stealing ppl's chain! haha but this is just a joke la huh, i hope no one steals my chain please.
weight of rider definitely plays a part. as for top speed, my bike top on straight road can go 125kmh, downslope can go 135kmh, and gradual upslope can go about 115kmh. my bike fully stock so cant expect much from it. heh ~