2010-2012 PRO-RIDE RUSH Switchback RMK Service Manual, Page 327Get this manual
Steering and Suspensions 2012 RTS Spring Guide The stock spring will accommodate most riders weighing between 120 and 260 lbs(54-118 kg)Two additional accessory springs are available for riders whose weight is at the lowest or highest settings for the stock springAll of the springs, spring gauge tools, and spring preload measurements using tape measure are provided in the RTS Spring Guide Table belowNOTE: Use tape measure in the same manner as gauge tool with the end of the tape against the spring tension adjuster knob and the preload measurement length at the shock-body cap parting line
2012 RTS Spring Guide Table
STOCK SPRING 120260 LBSSPRING PNRUSH7043195-133 Switchback7043160-133 STOCK SPRING GAUGE PN 9923267 Rider Weight lbs120-140 kg 54-64 Preload in1 12 MIN 34 cm 3.81 MIN 4.44 5.08 120 LWT SPRING 90155 LBSSPRING PN7041575-385 LWT SPRING GAUGE PNNA Rider Weight lbs90 95 100 105 110 115 120 180-200 82-91 18 5.39 125 130 135 140 150 155 kg 41 43 45 48 50 52 54 57 59 61 64 68 70 Preload in2 58 MIN 34 78 18 14 38 12 58 34 78 18 MAX cm 6.7 MIN 7.0 7.3 7.6 7.9 8.3 8.6 8.9 9.2 9.5 9.8 10.1 10.5 MAX 260 HD SPRING 240+ LBSSPRING PN7043585-385 HD SPRING GAUGE PNNA Rider Weight lbs240 255 270 280 295 310 320 335 kg 109 116 122 127 134 141 145 152 Preload in2 38 MIN 12 58 34 78 18 14 MAX cm 6.0 MIN 6.3 6.7 7.0 7.3 7.6 7.9 8.3 MAX