Julianne brought 3 bikes, including a fat tire which she rode. I rode her current double suspension, first ever double suspension i've ever ridden and much more comfortable than my hard-tail. Roy rode her older double suspension and took it home to try some trails. There was construction going on in Assabet, blocking our Taylor Rd route, so we spent some time in Assabet and Hopbrook across the road. On re-entering Assabet my back tire went flat and being tubeless without a spare tube, i waited at the visitor's center for Julianne to pick up me and the bike. The presta valve was slightly loose and may have let air out gradually until the tire loosened from the rim and it was impossible to inflate with a small pump. Always an adventure!