I recently noticed my back tire of my Mazda RX8 looked flat, after checking the pressure was 11 instead of 32. Since topping it up I'm getting vibration through the car at speeds of 50 - 75 mph.. any ideas ?
If the tire was run very long in its uninflated condition .. then it could have damaged cords or the belt ... or it could have heated to the point where the belt shifted .. that would unbalance the tire ... the tire should be removed, inspected for damage and rebalanced if ok .. its not a good idea to drive at 75 since the safety of the tire is questionable .. if the tire just sat for a long time underinflated but not being driven then it can take on a "set" or out of round condition .. that is temporary and will likely go away with continued driving .. driving with only 11 pounds wont take long to damage the tire ..
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