The rims definitely crack if you hit anything solid with them. One of the tracks that duckman966 and I both race at has metal barriers, on every corner. They're brutal. Even the best drivers occasionally tap them. These rims don't hold up to that abuse as good as some other rims do.
TOP rims have a smaller diameter than many other rims, so there is more air gap between the tire and insert and between insert and rim. Good in low grip conditions, but when grip comes up they feel a bit sloppy and have a greater tendency to traction roll.
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