At the high point of this evening's ride my chain snapped. Neither I nor my two mates had packed a chain tool. The gravity gods were with me and I managed to descend the best part of a couple of miles back to the paved road.
Despite having old school 26 inch wheels, 'the trail came alive' while trying to conserve momentum even over fairly rocky and rooty trails.
The jury is still out on what wheel size rolls best when you have to push me the last couple of miles home.