You'll be fine with plugs. I ran Road America up to 135mph on the straights with 4 plugs in my rear tires. If you're using the vulcanizing plugs, you'll be A-OK. Worst that could happen is the plug dislodges and you lose air pressure. But that won't happen if you plugged them correctly with vulcanizing plugs.
__________________
2013 Cadillac V-Wagon, RIP Z
|