This is a ride I designed to stay on the Rail Trails for about 20 miles, and almost accomplished that. I went on the newly paved Mass Central Rail Trail for about three miles. It needs crossing signage though, there should be some temporary signage. I tried out my new REI Ergon Mountain bike pro saddle on the Diverge and it wasn't bad, after a few adjustments. My sit bones did not hurt too much during the ride, but they were sore later in the day, and my back and hip were ok after I adjusted the seat to be more horizontal, as recommended. And, I pushed it forward a little, so as to not stretch my hip rotators i.e. piriformis as much. I will keep trying this out. I missed a turn into the Assabet River Wildlife Refuge, and rode on roads in Hudson for a little bit. I tried some fast riding to get some intervals in when no one was around on the MCRT and the ARRT. Could only last about 30 seconds though!