I first have to preface that I am 6'4"(195cm) tall, and weigh around 340 lbs. (154 kgs). By mentioning this, you would think that the caster wheels would at least be able to handle the weight and stress forces put upon the construction of the TR8 Pro and Alpine frames, BUT, you'd be wrong. The Caster Wheel's mounting materials are a bit too thin, for the amount of force placed upon them when sitting on the rig. These particular wheels that I'm referring to are screwed in, underneath the Seat end of the rig. I included a couple of quick photos to illustrate that the mounting plate, covering the bearings over the rollers, is not sturdy enough to handle such forces. I will say, that the other attached caster wheels had no stress issues, OTHER THAN, mentioning that the set of caster wheels isn't that great at staying in a locked position. Some tend to spring back into their UNLOCK position if jostled abruptly, entering or exiting the cockpit frame.
Although this review may sound like a negative review, I want the readers to take into account that I ride the limits of MOST SimRacing frames, and certain things can't always hold their weight, in MY case. These wheels are no exception. They are very much usable and would probably suit your needs quite well if you somewhat weigh significantly less than I do. Locking them in p[lace may be a little bit of a struggle considering they sit when into the frame of the cockpit and can be hard to reach if planning on locking them into place…