I'm 6'1 and the frame is 57, which I think is an idea height, The handlebar gonna get changed to either a riser or bullhorn (bullhorn's probably better for skid stop in confident) as currently it have those track dropbar which is fine, but not easy to use on road.

rat, the old MTB stem is too big, I'll try the handlebar first before getting a need stem, the tips of the stem, handle, post and saddle is great, and defintely save me some money in buying some carbon fibre seatpost, thanks for that, really.