BFGoodrich All-Terrain T/A KO2 increased weight

AhuraPro · October 27, 2015

I noticed immediately that the KO2's drove differently and had a much different turn-in. Discovered today the SR-As weigh 39.8 lbs and the KO2's weight 55 lbs!

That's 61 lbs difference!!

Not that it matters too much but DAMN!

sahls01gmc · October 27, 2015

I felt it big time when I put on 285's in place of the stock 245's.....oh my. Took a while to get used to it, but now I have compromised with 265's.

TxTruckMan · October 28, 2015

Yep. You almost need a gear change just going to LT tires. Lol.

kstruckcountry · October 28, 2015

Switching sizes is never a fair comparison. My ATPs weigh quite a bit more (I think 13 lbs ea) than the SRAs and I haven't found my mileage to be lower. Tracked 18,000 miles on Fuelly. Also, I spent almost $200 patching the 4 ply tires, 0 patches in the 10 ply so far (knock on wood).

The main difference is the SRAs don't grip AT ALL lol.

tnchevy · October 28, 2015

Then you are lucky, every work truck and personal truck I have ever had loses 1 to 3 mpg going to a larger, heavier, more aggressive LT tire. My 2012 F150 work truck went from 19mpg to 17.5 mpg going from the stock hancooks to wrangler AT Kevlar LT.

kstruckcountry · October 28, 2015

Switching sizes is never a fair comparison.

Just going to a heavier tire isn't going to change much. Tread compound and tread will affect mileage, but nothing will affect it as much as going to a bigger tire.

irish4life8911 · October 28, 2015

I went from stock SR-A's to Toyo MT's at 71 lbs each. Stop and go traffic takes a mpg loss, but I can still get 21 mpg on the highway.

amxguy1970 · October 28, 2015

Just going to a heavier tire isn't going to change much. Tread compound and tread will affect mileage, but nothing will affect it as much as going to a bigger tire.

Actually it does, been well documented...

It is a combination of them all but weight does play a large roll. It is called rotational mass and when increasing that by 15 lbs per wheel (seems to be close when going from a P to a E tire) that can increase weight by around 20% combined per tire assuming a 18 inch wheel weighs say 30 lbs and stock tire is 40.

Not to mention it slows acceleration, the midsize guys really feel the hit of a heavier tire.

Tyler

sailor9908 · October 28, 2015

I counteracted the heavier tire weight by adding a Magnuson MP1900 TVS Supercharger and American Racing Headers.... take that you big ole heavy tires!!!!

kstruckcountry · October 28, 2015

Actually it does, been well documented...

It is a combination of them all but weight does play a large roll. It is called rotational mass and when increasing that by 15 lbs per wheel (seems to be close when going from a P to a E tire) that can increase weight by around 20% combined per tire assuming a 18 inch wheel weighs say 30 lbs and stock tire is 40.

Not to mention it slows acceleration, the midsize guys really feel the hit of a heavier tire.

Tyler

If you've taken a high school physics class you know that weight doesn't matter much once something is in motion. Once the vehicle is rolling and the tires are turning the effects of weight are negligible. But, the more aggressive tread, width, large diameter, compound all matter.

Yes, it'll make a small difference in acceleration but not much more than running big rims.

TxTruckMan · October 28, 2015

Right, weight is a big player in stop/go situations, not for highway cruising. But most people spend most of their time in stop/go situations, so it's a decent factor.

RobZ71LM7 · October 28, 2015

Heavier tires suck for two reasons: 1) increased unsprung weight 2) increased rotational inertia

GMC-AT · October 28, 2015

I could care less, I'm keeping my KO2's and buying them again when these wear out. If you are concerned about weight, keep the stock street tires.

amxguy1970 · October 28, 2015

If you've taken a high school physics class you know that weight doesn't matter much once something is in motion. Once the vehicle is rolling and the tires are turning the effects of weight are negligible. But, the more aggressive tread, width, large diameter, compound all matter.

Yes, it'll make a small difference in acceleration but not much more than running big rims.

Nope, never have taken that class

Correct, at a static speed on level ground it isn't much but it still changes something. Any variation that causes a need for more power to offset (say a hill or needing to speed up some after slowing down some) it will decrease.

Now originally you said it isn't going to change much. Well if your city mpg drops by say 10% and you drive 50% of the city, that will lower your overall average no? Unless you are able to get a push start to highway speed and only drive that, you are going to lose mpg and have to account for that.

How much one considers "much" is up to each discretion, but 2 mpg average on a vehicle averaging 19mpg to most isn't minimal, that is over 10%...

Tyler

crafferty · October 30, 2015

I noticed immediately that the KO2's drove differently and had a much different turn-in. Discovered today the SR-As weigh 39.8 lbs and the KO2's weight 55 lbs!

That's 61 lbs difference!!

Not that it matters too much but DAMN!

Lol you didn't do any research before you spent money on a new tires?

I counteracted the heavier tire weight by adding a Magnuson MP1900 TVS Supercharger and American Racing Headers.... take that you big ole heavy tires!!!!

I like your style!

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