Tire size question.

[dljtruck]

just curious as to everybodys tire size preference.i personally run tall 24.5just works out with my trans and rears to my most efficient pulling speed. drive safe & take care, Dennis

[allikat]

That would also depend on your transmission gearing, and where you run. On some trucks, you could put tall rubber on them and they'd still haul oversize over the rockies without trouble. On others, they'd not pull the lid off a coffee with tall rubber.

[Big_Dave]

One day I was looking at the data plate on my door frame. It had 24.5's listed for the tire size. :wtf:

I've had 22.5's on it since the day I bought it.

I asked my 'tire guy' what the difference is. Here's what he told me........

24.5's and 22.5's are the same diameter, only the rim size is different. Same for Lo-Pro's

There is about a 1.5" to 2" difference in heigth between 'tall rubber' and Lo-Pro's of the same rim size.

Basicallyit all depends on the rear end gears and the transmission gearing you have as to how well your truck will pull a hill.

My truck has 22.5 tall rubber, 3.08 rears with a .73 'final drive' ratio in the transmission (13 sp). I can't pull a hill very good when loaded heavy. But I can sure run out on the flatlands. :ninja:

[Capt._Chaos]

I run 24.5 "tall" rubber myself.

When it comes time for new tires, if you have either 22.5 Lo-Pro or 24.5 "Tall" rubber casings, you will get more money for them, being they are popular sizes for recapping.

[liner]

Dave..I think your tire guy got it wrong.A 24.5 is not the same as a 22.5 ,but a 24.5 low profile tire would be the same diameter and height as a 22.5 tall rubber.

[DrivingZiggy]

The way I've read it is that the "LoPro" tires have less rolling resistance. Hence, giving better fuel mileage.

[nitestar]

I have lo pro on the drives and tall on the steer. just gives me a bit longer life for the tire that way. Got over 300 thou on the last set of steers. It didn't change anything like the headlight aiming or handling.
just my preference.

[truckerdale]

This is a good subject ... .. a low pro 24.5 (and I am pretty sure there are 2 sizes) is basically the same diameter as an 11R22.5 standard which is also pretty much the same diameter as a 10.00 x 20 tube type tire ... a 10.00 x 22 tube type tire is about the same diameter as a standard 11R24.5,, the low pro 22.5's have the smallest diameter of the bunch but not necessarily the best fuel mileage .. that low pro tire has to turn more reveloutions per mile than a standard size tire ,, therefore more fuel is used to go the same distance ... there is also (or was) an 12R24.5 tire .. slightly wider "footprint" on the ground .. as has been said ,, the gearing in the transmission and the drive axles have a great amount of influence in the mix also ... there is a 14% gear spaceing difference between the 14613 and the 12513 trannys ....... bottom line .. a rig set up for mostly flat land hauling doesn't perform so well going over the "great divide" ....






:rofl: :rofl:

[Wrongway]

Low pro's are reported to have a 5% lower rolling resistance than conventional tires. Since the rolling resistance is lower for a given speed, the tire temperature should also be lower.

The sidewalls are also shorter which generally means more strength & resistance to squirming & lateral flex under load. Less squirming improves tire heat & uneven wear issues.

Lo pro's lower the rigs center of gravity for better handling in curves.

As the overall diameter is smaller for a low pro, they must rotate faster for a given speed. This might cause an increase in tire temp and offset the lack of heat generated due to lower rolling resistance. A supposition
on my part.

You'll need to adjust your speedo or computer to correct for the reduced tire height.

[Uncle Truck]

If any wheel/tire combination has the same outside diameter at the tread, there is no different effect on the truck gearing or engine RPM at speed. LoPro tires have less sidewall flex, and offer up better handling. As tire friction is based on the tread itself, in JMHO after using both types on two different trucks, there was no noticeable MPG advantage to using LoPros.

Switching a truck with standard drive tires to LoPros is not a good idea. The lower sidewall will make for a smaller outside diameter tire, and increased RPM's for any given road speed. Unless the truck manufacturer did terrible math (it has happened ;) ) the original tire profile supplied with the truck will generally offer up the best overall performance and MPG for the given truck and it's gearing.

JMHO, but I think the LoPro tire and larger rim size has more to do with looks and performance than tire life or MPG. For trucks, the performance advantage will be felt more in the steers, where less sidewall flex with LoPro's should improve handling, which can improve safety.

UT