Ronix One I-Beam Timeboomb core For the past 17 years, nobody has defined the progression of a classic 3-stage rocker more than Danny Harf and his signature series. His latest best seller takes an explosive snap and adds speedwalls. Having less resistance with the water means less strain on your body, giving longer boat sessions, and increased top water speed. New for 2017, having a core that features the I-Beam Construction that ignites like no other. Size HEIGHT (INCHES) 3-Stage STANCE (6 inches board/Plate) WEIGHT RANGE (LBS.) 134 2.2 3-Stage 21.5-25.5 Up to 165 lbs. 138 2.3 3-Stage 22.5-26.5 Up to 180 LBS. 142 2.4 3-Stage 23.5-27.5 170 lbs. and up 146 2.5 3-Stage 24-28 175 lbs. and upRonix