After picking up a set of long rack braces I tested out a Topeak child seat on the back of my New World Tourist with a 25-pound bag of rice. Setting up the rack, by the way, was straightforward but a quite annoying task. But after an hour of jiggling and fumbling for different adaptors and parts, it was secured to the rear of the bike. After a quick test ride it was clear that riding with the child seat was sub-optimal. On a regular diamond-frame bike there is a top tube that one can use his/her legs to push the bike upright when at a stop.
That is, if the bike begins to tip over, one typically uses a leg to push against the top tube to keep the bike upright.
|No top tube!|
However, the monotube design of a Bike Friday takes away that point of contact such that one will have to keep the bike upright via leverage on the handlebars or perhaps sliding a leg behind you to lean against the seat mast. My conclusion was to pass on the child seat and only use the trailer when carrying children.
While a child trailer is very stable -- all of them appear to be two-wheel designs -- they generally attach to the rear axle of a bike. Consequently, when mated with the small 20" wheels of the Bike Friday instead of a 700c/27" wheel, the trailer has a noticeable forward tilt. Particularly with small children who have a harder time reaching the floor and pushing back, this would probably cause them to tilt forward against the restraints and eventually contort themselves into some sort of equilibrium. My solution is to flip the Burley trailer mount such that it attaches above the axle instead of below it.
Instead of the attaching to a point an inch or two below the axle, it attaches to a point an inch or two above the axle. Resulting in a much more level trailer and presumably more comfortable kiddies.