For Foam Inserts we have a term and definition in Remote Control Cars.

Foam Inserts (Remote Control Cars)

In the early days of R/C, tires were either foam (for on-road use) or hard rubber (for off-road). The foam donuts did not need inserts, and the off-road tires were hard enough that they could support the weight of the car without collapsing. As tire and car development continued, the tires got softer and required inner foams to make the tire keep its shape on the track. Touring car development followed the same trend as off-road tires: early tires were made of a hard enough rubber that no inner foam was necessary, and eventually tires got soft enough to require them. Most soft compound tires come with a open cell foam insert, while modern sedan racing tires since about early 1999 come with no foams at all, so racers can choose the best molded inner foam for their specific needs. If you do not race, you can use (and re-use, when the tire is worn out) the standard open cell foam insert that comes with your tires. If you do race, you would be well advised to ask around at your local track to find out what tire and insert combination works best!

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