I am looking at buying a used Trek Brusier. It is a good deal and has a good compontent package. Although I need some help with the sizing. I am 5ft. 9in. and ride a 18in. XC setup now. The Trek is 16in. but is a Freeride/Out of Bounds type bike. I have noticed that the mesurment from the top of the seat tube to the middle of the bottom bracket seems to be shorter on most of these types of bikes. Do you think this will fit me to do some light freeride stuff? Thank you!