I did the Bike Biak tour couple of weeks ago - great fun. My suggestion is if you want a great ride and no sore bum during and afterwards invest in a $19 gel bike seat cover which can be bought at Big W or any bike shop - it was sensational. While everyone else had sore bums and were reduced to standing up on their peddles to relieve the discomfort I just sailed on in total comfort. Also great to use on exercise bikes.