Do some of you, a lot of you, any of you do much road riding? If so do you switch to a roadie or do you take the mtb on the road? So far the longest I've ridden the mtb on-road in this riding incarnation is 15 miles. I can maintain an average speed of about 10-12 mph. In my last incarnation my physical limit was about 28-30 miles @ about 12-15 mph avg. mtb on-road. I was able to do more on the roadie.