Rad uses 350mm/27.2mm seatpost. I had to upgrade to the 400mm Suntour SP-12 NCX being 6'3". I also added a Sunlite 0-60 degree adjustable stem and set it to around 45-50 degrees to my 2016 Radrover after I added the 400mm seatpost. You might need a longer seatpost if you are +6'2".