Great thread.
Do you mind if I ask why you went with 20" wheels instead of upgrading to 21"?
Was that because it's somehow better for track use, or because there are more PS4S tire options in 20", or some other reason?
I'm deciding whether to go 20 or 21 inch HREs and interested in why you stick with 20s when everyone seems to go with a larger 21 inch rim:
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