I had to do change my summer tires before a long trip because they were done. I found 3 bridgestone run flats in great condition, so decided to look for another same dimension run flat. Now I have 3 bridgestone and 1 dunlop , all runflat and 245/40/19. Now , what are the possible problems running one tire different than other 3 ? Is it ok for a while at least ? Just to complete my trip and safely come back ? Some say it can blow the differential, and some say the car will pull to one side. Tread depth wise , all 4 tires are almost identical. Please help. Thank you

 

Just put the two Bridgestone in the rear, and have the Dunlop in the front. You should be fine. Some people have 4 different tire brands in their cars. Just get it changed when you get a chance.

 

As long as they're the same class of tire (AS, Snow, 3-season, run-flats), you'll be fine.

Keep the tires with the most similar tread depth on the same end (front vs. rear). And put the tires with the most tread depth in the rear.

 

So 2 bridgestone in front then 1 bridgestone and the dunlop in rear?

 

IMO, if you're not pushing the car mismatched tire types is [barely] acceptable. If you are... You'll start to notice traction differences which can lead to issues. For the given tires models/size, what does tire rack indicate the revs/mile spec to be? Even if its close, there's likely to be traction coefficient and contact patch differences.

ymmv.