I have the iBert front-mounting child seat. I've used it previously attached to my street bike as in the below image, but between the straight bars and the shifter triggers, I had to mount it so low that my knees knocked against it while riding, which is a non-starter.
I recently acquired a long-tail cargo bike with cruiser-style handlebars, which I intended to use with the iBert seat. Unfortunately, the stem is fixed-height and does not have the 3/4" straight length between the frame and handlebars required for the T-bar mounting post (see the maker's website).
However, the seat post is adjustable, so I thought I might be able to simply mount this seat in the rear instead. Most child seats are rear-mounted, the seat post seems as durable as the stem, and in this configuration the seat won't be moving side-to-side as it does when attached to the stem.
I can't find anywhere on the maker's website that this is explicitly prohibited or warned against. I have emailed them, but the response I received was that they have been purchased by another company and "appreciate your patience" while they go through that process - no response with respect to the mounting locations. I also don't see anything online that addresses whether it's a reasonable "hack" to mount the seat this way. The mounting bar is a simple assembly with two bolts that I'm sure I'll be able to physically attach to the seat post, high enough to clear the rear rack. What I'm not sure of is:
- Is this likely to damage the bicycle?
- Is there reason to think this would be unsafe for my passenger?
I am also not sure if the legs of the seat will interfere with the rider in front; assuming it's safe enough for the passenger and the bike, I can test that out on my own.
The bike is equipped with a sturdy double-leg kickstand, such that both tires are in contact with level ground when the kickstand is deployed and the bike is stable for loading/unloading.