I actualy work at ikea and work with Sladda. I thought it was gonna be lower quality stuff but its actualy very decent. even the bike. I dont like the 2 speed auto but the way the hubs made you can simply just swap the rear wheel with like a multible gear. The trailer is most likely best suited for bolt on back wheel. Personaly I think its a decent trailer. if the springy thing ever breaks just do what ive done to other trailers replace it with a chain works very good