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I placed a piece of tape (sorry it's white in color) in the same location on all (4) rims so you could see the different wheel speeds inside of the track. In this video, only the corner tires are being driven by the axles. The center axles have been disconnected from the tires/rims.
This is an levated belt gear reduction argo track. Center axles have free-wheeling wheel spacers (track tuners). Video shows how track belting is driven at a slower speed than the outside of the tire treads and how the grousers adjust to match the larger circumfrence of corner tires. However, because all tires are connect by chains and they travel the same speed, the trapped center tires experience a situation where they are riding on top of a slower-moving track. The center tires benefit from being "disconnected" so that they are able to roll along inside the track to perfectly match the speed of the slower-moving track belting (and therefore grousers) that they are riding on top of. If not disconnected from axles, the center tires will simply "overdrive" or slip on top of the slower moving track. Disconnecting them will free up horsepower and give you the full benefit of a slower crawling ground speed (everywhere the track touches the ground), even though your corner tires travel full speed. It takes less power to drive an elevated-belt gear reduction track because of this effect. Less torque needs to be delivered to the axles, and less throttle is required most of the time. For example a 25" tire wrapped in an elevated-belt gear reduction track, will drive the track at a speed equal to a 19" tire, and the torque required to do so is much less than wrapping the original 25" tire with a typical Non-elevated belt (longer track belting) factory or aftermarket track that has bolt on tire guides or individual grousers that have grouser-guide "tips." A track that drives on top of the track belting or that has track belting next to the tire treads at ground-level will always require more torque to drive the track, and its guides can also be manipulated which can be problematic.