So I found this pannier rack adapter made by dutch company called Steco, which bolts on top of the Radrunner rack, very sturdy and you can virtually mount any child seat onto it. I was able to fix my Hamax seat onto it and am very satisfied. Maybe it could solve your problem too.

Quote from: mportas on December 16, 2022, 06:53:40 PM
@shroffman . There are several brands in which the seat already has an adjustment system, or includes the attachment to add the seat to the rear rack. I order a seat from "Urban Iki" on Amazon since it has good reviews, and supports bigger kids (up to 22kg). I think "Belleli Pepe" (also available on amazon) includes the mounting system to attach to the rear rack as well.
Thule seats seem great, but are limited to 40 pounds, and are also very expensive.

@importas Thanks for that, didn't realise about Urban Iki, will definitely look into it!

Thanks or sharing this, I don't know why there seems to be only one seat in the world that fits the Wagon/Runner. Which Bobike seat model do you have? Thanks

Quote from: ChickenLegs on September 05, 2021, 02:20:25 AM
Hi all,
New wagon owner here. Still waiting on a couple of accessories I wanted to at least be able to take one of the kids out.
Loads of talk about which child seats fit, mostly the yepps. We have a bobike seat and it fits well. I rotated the bottom clamps 90 degrees to fit the base plate to the rack. The seat clamps in tightly. I can lift and shift the back end of the bike holding onto the child seat. The seat would also fit at the front of the rack, and I could have used the downtube brace instead of clamping to the rack, but back of the rack is good for now.
First ride with the youngest got a thumbs up, especially as she could lay her legs out on the rack. In full repose!

I have a rear carrier mounted Hamax child seat which was used on a different bike before I got my Radrunner, The integrated rear rack of the 'Runner' seems to only fit Thule child seats but before I think about buying of these, does anyone know of a mod or hack to fit other brands of seats? Thanks!