My rig is on the heavy side but a Wilbers model 641w/option 625(remote adjustable preload) and a 59/59-245-175 coil spring works for me. I believe that the Paralever geometry is slightly different between the 1100 and 1150 models. If you have a sway-bar the sidecar and rear suspension will affect each other as well. On the front I have a YSS shock with a Hyper-Pro coil spring, 1cm longer than stock with adjustability for another 1cm. This takes care of the smaller front wheel. I'll check the front coil spec ASAP.