Tire profile size

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randrir

New Member
Apr 15, 2016
3
0
1
Truck Year
2015
I'm going to switch my tires to BFG TA K02's and I'm looking at 20 275 65's or 20 275 60's which of course is what is on the truck now. Which does everyone think would be better? I'm also considering 20 285 65's. I know the 65's will throw off the speed and odometer but other than that which would be better including looks because of course we all care what they look like too. Also any handling differences. I know a lower profile tire is better on a sports car but maybe not on a truck.
 

Brokedownbutgood

Active Member
Apr 17, 2016
289
102
28
Truck Year
2015
Quit caring about looks! Now lets figure out what tire size works best for you. 285 is wider than a 275 and 75 is taller then a 70. But the stock size is great. Go with an LT rated tire(bfg k02). Im a big fan of 285/70R17 and have had great success with it. The reason why, is its readily avaliable and comes in an LT rating. Now the bfg K02 has an D load rating in the stock size, which is more than enough for our trucks. So why change sizes?
 

BoostN

Administrator
Staff member
Administrator
Jul 27, 2013
3,745
958
113
Tennessee
ecodieselram.com
Truck Year
Not Listed
I personally like a little bigger tire, it helps fill the truck out and make it look more like a truck.Everyone has a different opinion though.
 

BoostN

Administrator
Staff member
Administrator
Jul 27, 2013
3,745
958
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Tennessee
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Also, the BFG's are one of the better looking tires and really hard to be the performance from what everyone says. They might be my next tire. Nitto just released the "Ridge Grappler" and it looks great as well.
 

flying7

Active Member
Jul 15, 2014
175
41
28
CALI
Truck Year
2014
I do like a bigger tire as well. the stock goodyears are junk!!
 

jdn112011

Well-Known Member
Oct 18, 2015
1,202
310
83
27
Roseau, MN
Truck Year
2015
Quit caring about looks! Now lets figure out what tire size works best for you. 285 is wider than a 275 and 75 is taller then a 70. But the stock size is great. Go with an LT rated tire(bfg k02). Im a big fan of 285/70R17 and have had great success with it. The reason why, is its readily avaliable and comes in an LT rating. Now the bfg K02 has an D load rating in the stock size, which is more than enough for our trucks. So why change sizes?
He's quoting sizes of 20" rims so that's irrelevant
 

jdn112011

Well-Known Member
Oct 18, 2015
1,202
310
83
27
Roseau, MN
Truck Year
2015
If you have any reason to get a load rated truck tire a 65 series 20" rim is a great option. It's a half inch more profile on each side of the rim, one inch total larger, significantly deeper tread, they're readily available because it's Ford super duty's standard 20" tire size. A 275/65/20 also has one of the highest payloads of an E rated tire.

Downside, you need a hypertech speed calibrator because a 34 is not available in stock ecm. The factory 20 which is a 33" is the largest tire in the factory ecm, the 17's and 18's are not 33 which is why they are in the factory ecm.

A 275/65 is a slightly narrower 35x12.5. They run about 10-11 wide instead of 12.5. And a 35x12.5 flotation tire actually measures 34.5. Depending on the particular tire a 275/65 runs between 34 and 34.5. So virtually the same.

Depending on your particular truck you may need to trim wheel well inserts or get 1/8 inch wheel spacers though to prevent rubbing!
 

randrir

New Member
Apr 15, 2016
3
0
1
Truck Year
2015
If you have any reason to get a load rated truck tire a 65 series 20" rim is a great option. It's a half inch more profile on each side of the rim, one inch total larger, significantly deeper tread, they're readily available because it's Ford super duty's standard 20" tire size. A 275/65/20 also has one of the highest payloads of an E rated tire.

Downside, you need a hypertech speed calibrator because a 34 is not available in stock ecm. The factory 20 which is a 33" is the largest tire in the factory ecm, the 17's and 18's are not 33 which is why they are in the factory ecm.

A 275/65 is a slightly narrower 35x12.5. They run about 10-11 wide instead of 12.5. And a 35x12.5 flotation tire actually measures 34.5. Depending on the particular tire a 275/65 runs between 34 and 34.5. So virtually the same.

Depending on your particular truck you may need to trim wheel well inserts or get 1/8 inch wheel spacers though to prevent rubbing!
Thanks this is a lot of valuable information. One of my main concerns is clearance sine I've only raised the front end a little bit using the Bilstein's set on 2.1 to level it. I was also considering the 285 65 20 BFG but it is 34.6" and I think I would have to bring the front end up more. With the information I've gotten on this thread I think I'll go with the 275/60 20 tires. Thanks again.
 

jdn112011

Well-Known Member
Oct 18, 2015
1,202
310
83
27
Roseau, MN
Truck Year
2015
Thanks this is a lot of valuable information. One of my main concerns is clearance sine I've only raised the front end a little bit using the Bilstein's set on 2.1 to level it. I was also considering the 285 65 20 BFG but it is 34.6" and I think I would have to bring the front end up more. With the information I've gotten on this thread I think I'll go with the 275/60 20 tires. Thanks again.
If you've already added a leveling kit I'd assume you to be just fine, height isn't really the problem section width is what will make you rub. Only way you'll know is trying it. Worst case scenario maybe a 1/8 inch spacer would be necessary. Which is very inexpensive. Or if you're planning to change the rims from factory then changing offset would correct it.

My assumption having already done blisten leveling shocks you'll be more than fine