"Stock Raptor BFG Tires. What you need to know!"
written by MarkT
Ford worked with BFG to create a unique
tire for the Raptor. One reference to what they did is here:
Originally Posted by http://www.autoblog.com/2009/08/24/first-drive-2010-ford-f-150-svt-raptor-is-a-diamond-on-the-roug/
"Those BFGs, while made in the same molds -- and carrying the same tread pattern -- as traditional BFGs, have a unique compound. ....they worked with BFG and changed the thickness, belt angle, and compound..."
The result is that there are two
BFG tires available that to the naked eye look identical but are different in construction and rubber compound. The two versions of the tire should not be mixed on the same vehicle.
So how can you tell the difference? What do you look for if you need to replace one tire in a set or if you want to make sure you are getting the "Raptor spec" version of the BFG T/A KO?
Besides the obvious things such as size, brand, and model of tire... you need to check the speed rating on the side of the tire. The "Raptor spec" tire is rated "S" while the similar-looking tire is rated "R". See photo of what to look for below:
Speed Rating "S"= Raptor spec tire
P.S. If you are interested in more (general) information on the tire markings, the Ford F150 Owner's Manual has several pages on the topic.