Nearly 4 years old - how far?
I've just got our son, who will be four at the end of December, on the tandem for the first time. We only went to the local park and back, a total of 4 km, but he enjoyed it and wants to go out with me again. How far could I reasonably expect him to ride with me, without getting tired/bored? I'm thinking of doing some of the local fun rides in the next month or so, which have 25-30 km options - a couple of the rides are laps, so I could enter the longer distances, do one lap with the tandem and then swap to my single bike for the other(s).
As an aside we did ride up to 100 km with him when he was in his bike seat.