Thank you for the feedback, lots of good tips. I'm now playing with the idea of an IGH, probably an Alfine 11 Speed with a belt drive. I did ride the SRAM and I like the Rival better than the 105. Any thoughts for or against an IGH with a belt drive for commuting, light off roading, and some road training and city riding? I do have a road and mtb, and this would not replace those, but would be used on shorter training rides, etc. on the road.