i thought donuts were rated for 100miles at 50mph max? but our donuts are bigger so not sure. i suppose you can continue to use for emergencies as long as it's pressured up (60psi) and no cracks or anything on the sidewall and treads.
about the patch in race conditions... hummm... really depends on the condition of both the tire and track. ive had both plugs (the ones you push-in from the outside) and patched tires in the past and they lasted the full tire life. no racing, but spirited driving on street.
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