Thw UPS "lady" dropped off my new BFG all terrain tires yesterday and they looked great so I just looked at them breathin' in that new tire smell... They are supposed to be 32" tall but they actually measure 30 1/2" tall... WHY ! no they are not mounted yet-

 

thats the way the cookie crumbles.. i never had a BFG mesure up to what was on the side wall. i think they list teh ACTUAL dimensions on their website.. i know the interco tires are usually about what is written on the sidewall..



Ray

 

so... its like when ya measure the dimensions of a 2x4 piece of wood and it aint a 2x4 ??? so i could have gotten 35 " tires and the would have fit ???

 

last time i measyred 35" bfg they were 33" they all about 2 inches smaller..


Ray

 

giggity i hate that !

 

double post sorry mods

 

oops.. ya i hate it too took me a couple sets of tires for me to figure out i was getting jipped.. so now i measure them for fun when i see a set i like or go on their websites..


ray

 

I just measured the tires that are on there " 32in." and its the same story-

 

It is best to go and measure the tires then buy online if you go that route! Hopefully this doesn't throw your gearing off too bad, unless your saying the old ones were the same size then all is good! Can you send them back or see if they will help you swap them locally if they are a big name mail order company they might have the same parent company as a big tire chain company in your area.

 

no. luckily everything works out good- but ill know now if i ever do a lift and tire size is critical-

 

All the tire companies do this. I saw an artical in "Offroad" on this subject a few years back. They went and measured a whole bunch of mounted tires. All were small. The Michkey Thompson's were the most honest. (But were still small). Not only that, there is a big differnce in the width of the tread for the same size tires. My Dirt Grip's are 2" wider than my old Super Swamper's of the same size. The companies all claimed that it is difficult to give exact sizes. Its funny how their estimates dont ever seem to be off to the low side.

 

um they WILL expand when air is added to them..Mount them and add air, then see.. I bet they are 32 then....

 

Like I said, they measured them mounted. I will take that bet any day. I had 35" BFG's. They mesured about 33" mounted brand new. My current tire (38" dirt Grip) measures about 35". But they are warn. (not an 1 1/2" though)

 

I'm gonna pump them up to 36"-

 

I would say they will probably expand about an inch or so. You have to take into account, air temp, tire temp, rotational forces, etc.
When a tire is going down the road at 55mph, it is indeed taller than when it sits at 0.
Sidewall flex adds to the equation as well. Especially with these bigger "A/T" tires. Most tires are rated and sized at 55 Mph. I know many are going to question this and laugh, but those beings are just not in the "know". Look at dragster tires, I know there is a difference in those are supposed to flex, but I am telling you street tires will flex as well, just not the 8 inches drag tires do. Maybe do a search on sidewall or tire flex. and to those who laugh, maybe you better think about tire rollout before you laugh.

And yes, I do a little tire tech and racing on the side.