Looking at a pair of 285/35R19 max performance summer tires for the rears... want to go staggered. Most in this tire size range are load index rated at 99(1,709lbs.). The manufacturer recommends 100(1,764lbs.). Is it a big deal going a bit lower than Ford's recommendation?

The fronts will stay at 255/40R19. Thanks in advance.

 

What wheels do have for the rear?

 

55lbs isn't going to make a huge deal in the rears. I'd be more concerned if it was for the front wheels, because most of the weight is up front. I'd say you'd be fine, but I wouldn't recommend going below 98 in the future.

 

Are you using the Brembo wheels?
Be sure to post some pics, not a lot of pics of 285's on brembo wheels, would love to see the fit and look.

 

I want to go staggered... 10" for the rears. The Brembo wheels I plan to shod with a set of all-season tires.

Another thing of note is that the OEM Pirellis are XL(Extra Load) where as the 285's are SL(Standard Load). I'm trying to do some browsing for an understanding of these values.

 

Of course, this is the answer I was hoping for... Lol! Thanks for the response. I was a little concerned that Ford required this spec due to our vehicle's weight or something else... I wouldn't like for a tire to fail while doing any kind of spirited driving activity.