No. Everything is included. The second holder is practical if you want to use the seat for two bikes.

I don't understand your question. The product looks very good but is not suitable for my bike as it hits the rear wheel. :(

Unfortunately, the manufacturer does not provide this information. This seat is tested for maximum safety.

No. Should fit all wheel sizes.

I don't think so. The bracket is squeezed tightly around the seat tube with rubber and 4 screws.

Hi user_yves, who bought the Thule RideAlang, stated in a previous answer, that everything is included :) https://www.galaxus.ch/de/s3/QuestionAndAnswer/was-ist-genau-bei-diesem-sitz-dabei-sind-die-stangen-halterung-und-der-halter-fuer-den-rahmen-dabei--278614?productTypeId=815

It only works on the bicycle frame

Everything is included. For a second bike you would only have to buy the additional holder.

Hello! The plastic part itself is conically shaped and 123mm long at its greatest length. The 2 screw terminals inside have a distance of 95mm from outer edge to outer edge. Hope this helps!

As soon as the child can sit upright on its own. Helmets are only compulsory for bicycles up to 45 km/h. I recommend always wearing a helmet (also for scooters). For the child, I recommend the Alpina Carapax Flash helmet. Adjustable and in beautiful colours for boys and girls. Also available at Galaxus.

This seat is attached directly to the frame. It fits most bicycle frames (round frames from 27.2 to 40 mm in diameter and oval frames up to 40 x 55 mm).

is it about the seat? only one holder is included. without a bike

This is an understandable question, but unfortunately I cannot answer it. I recommend making the same enquiry to the manufacturers of both the bicycle and the seat and only buying the seat if the answer is positive on both sides.

Yes; the seat is attached to the centre tube of the bike where the saddle is located. No attachment to the luggage rack.

What do you mean by quick release bracket? The linkage 2o the seat is attached?

You can find the matching additional bracket here: Thule additional holder for THULE RideAlong